BAKER, J.G
1871.Genus Haworthia Duval. Refugium Botanicum 4:t232 et seq (1871).
1880.A synopsis of Aloineae and Yuccoideae. Journal of the Linnean Society 18:148.
1896.Haworthia Duval. In: Flora Capensis 6:333.
BARKER, W.F., et al.
1942.Plantae novae africanae, Series 18. Journal of South African Botany 8:246.
BAYER, M.B.
1962.A new variety of Haworthia limifolia from Natal. Journal of South African Botany 28:215.
1970.Haworthia as a problem genus. Cactus and Succulent Journal (U.S.) 42:25
1971.Changes in the genus Haworthia Duval. ibid. 43:157.
1971.Haworthias in the Robertson Karoo ‑ South Africa. Journal of the Cactus and Succulent Society of New South Wales 8:9.
1972.Anguish among the Haworthias. Cactus and Succulent Journal of Great Britain.
1972.Natural variation and species delimitation in Haworthia Duv. Part 1. Haworthia reticulata Haw. National Cactus and Succulent Journal 27:10.
1972.do. Part 2. H. herbacea (Miller) Stearn. ibid. 27:51.
1972.A new species of Haworthia (Liliaceae). Journal of South African Botany 38:125.
1972.Reinstatement of the genera Astroloba and Poellnitzia (Liliaceae ‑ Aloineae). National Cactus and Succulent Journal 27:77.
1973.Leaf spirals in Haworthia. Aloe 11:31.
1973.Two new species of Haworthia (Liliaceae). Journal of South African Botany 39:249.
1973.Natural variation and species delimitation in Haworthia Duv. Part 3. H. reinwardtii Haw. and H. coarctata Haw. National Cactus and Succulent Journal 28:80.
1974.Haworthia Duv.: Section Retusae fide Scott ‑ Additional comment. Aloe 12:89.
1974.Haworthia ‑ small relatives of Aloe. Excelsa 4:17.
1974.New Haworthias. Cactus and Succulent Journal (U.S.) 42:75.
1975.The retuse Haworthias. Excelsa 5:83.
1976.Haworthia Handbook. National Botanic Gardens of South Africa, Kirstenbosch.
1977.Corrections to Haworthia Handbook. National Cactus and Succulent Journal 32:18.
1977.Haworthia mirabilis Haw. Excelsa 7:37.
1978.Reflections on G.G. Smith’s Haworthia collection: 1. H. retusa (L.)Duv.: 2. H. mutica Haw. ibid. 8:46.
1979.Natural variation and species delimitation in Haworthia Duv. Part 4. Haworthia emelyae V. Poelln. and a new variety. National Cactus and Succulent Journal 34:28.
1980.Looking for Haworthias. Calandrinia :57. Succulent publications of South Australia.
1980.A story of Haworthia nitidula V.Poelln. (= H. mirabilis Haw.). Cactus and Succulent Journal (U.S.) 52:10.
1981.Three new species of Haworthia. Journal of South African Botany 47:789.
1981.Natural variation and species delimitation in Haworthia Duv. Part 5. Haworthia angustifolia V. Poelln. National Cactus and Succulent Journal 37:31
1982.Observations on the G.G.Smith collection of Haworthia. National Cactus and Succulent Journal (Great Britain) 37:105.
1983.New Haworthia Handbook. National Botanic Gardens of South Africa, Kirstenbosch.
1986.Haworthia and nomenclatural confusion. British Cactus and Succulent Journal 4:8.
1986.Haworthia – confusion reigns again. Excelsa 12:91.
1987.Natural variation and species delimitation in Haworthia Duv. Part 6. Haworthia maculata (V. Poelln.) Bayer. British Cactus and Succulent Journal 5:13.
BAYER, M.B. and PlLBEAM, J.W.
1974.Name changes in Haworthia concerning H. obtusa Haw. and H. pilifera Bak. Cactus and Succulent Journal (U.S.) 46:166.
BERGER, A.
1908.Liliaceae‑Asphodeloideae‑Aloineae. In: Engler, A., Das Pflanzenreich N (Heft 33):74.
BEUKMAN, RUTH AND VLOK, JAN.
1991.A nurse-patient association: Hypodiscus and Haworthia. Aloe 28:90.
BRANDHAM, P.E.
1969.Chromosome behaviour in the Aloineae: i. The nature and significance of E‑type bridges. Chromosoma (Berl.) 27:201.
1969.do. ii. The frequency of interchange heterozygosity. ibid. 27:216.
1970.do. iii. Correlations between spontaneous chromatid and subchromatid aberrations. ibid. 31:1.
1971.The chromosomes of the Liliaceae. Kew Bulletin 25:381.
1974.Interchange and inversion polymorphism among populations of Haworthia reinwardtii var. chalumnensis. Chromosoma (Berl.) 47:85.
BRANDHAM, P.E. and CUTLER, D.F.
1981.Polyploidy, chromosome interchange and leaf surface anatomy as indicators of relationships within Haworthia section Coarctatae Baker (Liliaceae‑ Aloineae). Journal of South African Botany 47:507.
BRANDHAM, P.E. and JOHNSON, M.A.T.
1977.Population cytology of structural and numerical chromosome variants in the Aloineae (Liliaceae). Plant Systematics and Evolution 128:105.
BROWN, J.R.
1934.Notes on Haworthias. Desert Plant Life (1934‑37, 1946).
1937.Notes on Haworthias. Cactus and Succulent Journal (U.S.) (1937‑1965?).
1957.A brief review of the genus Haworthia. ibid. 29:129.
CHINNAPPA, C.C. and SEMPLE, C.C.
1976.Chromosome aberrations in a diploid Haworthia subfasciata. Canadian Journal of Genetics and Cytology. 18:281.
CRAIB, C.
1990.Some rare Haworthias in South Africa. Aloe 27:23.
CUMMING, D.
1987.The affinities of Haworthia bruynsii. Bayer. British Cactus and Succulent Journal 5:3.
CUTLER, D.F.
1978.The significance of variability in epidermal cell wall patterns of Haworthia reinwardtii var. chalumnensis (Liliaceae). Revista Brazileira de Botanica 1:25.
1979.Leaf surface studies in Aloe and Haworthia species (Liliaceae); taxonomic implications. Tropische und Subtropische Pflanzenwelt 28:447.
1985.Haworthia spp. (Liliaceae) with window leaves: SEM studies of leaf surface adaptations. Parodiana 3:203.
DODSON,J.W.
1946.Haworthia Review. The Succulent Liliaceae League of America. 1 & 2.
DUVAL, H.A.
1809.Plantaesucculentae in Horto alenconio. (see W.T. Stearn, The Cactus Journal 8:105, 1939).
DYER, R.A.
1937.A note on the occurrence of vivipary in Haworthia truncata Schonl. South African Journal of Science 33:335.
ESTERHUIZEN, J.M.
1992.Some notes on Haworthia magnifica V.Poelln. var. magnifica and Haworthia magnifica var. atrofusca (G.G.Smith) Bayer. Aloe 29:
1992.In search of Haworthia heidelbergensis Smith. Aloe 29:64.
1996.More notes on Haworthia heidelbergensis G.G.Smith as well as Haworthia magnifica V.Poelln. var. magnifica and Haworthia magnifica var. atrofusca (G.G.Smith) Bayer. Aloe 33:15.
FEARN, B.
1966.Windowed Haworthias. National Cactus and Succulent Journal 21:28.
FOURCADE, H.G.
1932.Contributions to the flora of the Knysna and neighbouring divisions (H. monticola). Transactions of the Royal Society of South Africa 21:78.
HAWORTH, A.H.
1804.A new arrangement of the genus Aloe. Transactions of the Linnean Society 7:1.
1812.Synopsis plantarum succulentarum.
1819.Supplementum plantarum succulentarum.
1821.Revisiones plantarum succulentarum.
1824.Second decade of new succulent plants. Philosophical Magazine and Journal 44:300.
1825.Fifth decade of new succulent plants. ibid. 46:280.
1827.Description of new succulent plants. ibid. 7:123.
1827.Description of new succulent plants. ibid. 2:346.
1828.Description of new succulent plants. ibid. 3:186.
HAYASHI, M.
1987.Callus characteristics and classification of Haworthia and allied species. Journal of South African Botany 53:411.
HUTCHINSON, P.C.
1951.Studies in the genus Haworthia Duval :1. Vegetative variation in the section Fenestratae V.Poelln. Cactus and Succulent Journal (U.S.) 23:99.
JACOBSEN, H.
1951.Haworthia Duval: Review of sections and species. Sukkulentenkunde 4:97.
1965.The genus Haworthia Duval. Kakteen und andere Sukkulenten 3:7.
KAUL, K. and SABHARWAL, P.S.
1972.Morphogenetic studies on Haworthia: Establishment of tissue culture and control of differentiation. American Journal of Botany 59:377.
1975.Morphogenetic studies on Haworthia: Effects of inositol on growth and differentiation. ibid. 62:655.
MAJUMDAR, S.K.
1970.Production of plantlets from the ovary wall of H. turgida var. pallidifolia. Planta 90:212.
1970.Culture of Haworthia inflorescences in vitro. Journal of South African Botany 36:63.
1979.In vitro culture of flower buds of Haworthia and Astroloba. Phyton 27:31.
MAJUMDAR, S.K. and RILEY, H.P.
1967.Chromosomal alteration in relation to speciation in Haworthia. Advancing Frontiers of Plant Sciences 18:63.
1970.Pollen conditions in Haworthia species and hybrids. American Journal of Botany 57:742.
1973.Chromosome numbers, pollen fertility and pollen size in Haworthia species and hybrids. Canadian Journal of Botany 51:1753.
MAJUMDAR, S.K. and SABHARWAL, P.S
1968.Induction of vegetative buds on inflorescence of Haworthia in vitro. American Journal of Botany 55:705.
MAJUMDAR, S.K. and SCHOLOSSER, S.A.
1972.Morphological and histological studies of the effects of sodium cyclamate on Haworthia callus in vitro. Canadian Journal of Botany 50:1013.
MAJUMDAR, S.K. and SULLENDER, J.S.
1977.The fine structure of 2,4‑D induced tumor cells of Haworthia variegata. Phyton 35:145.
MARX, GERHARD.
1996.Mixed windows in the wild. Aloe 33:18.
MOTOHASHI, T., KANOH, K., HAYASHI, M. AND KONDO, N.
1985.Relationships between polyploidy and geographical distribution in the genus Haworthia (Liliaceae-Aloineae). Science Report 2:87, Res. Instit. Evol. Biology, Tokyo.
PILBEAM, J.W.
1969.Haworthia tortuosa. National Cactus and Succulent Journal 24:41.
1970.The first fifty Haworthias. The Succulent Plant Institute, England.
1971.Haworthia reinwardtii (S.D.)Haworth. National Cactus and Succulent Journal 26:54.
1971.Haworthia reinwardtii (supplement). ibid. 26:77.
1971.Haworthia viscosa. ibid. 24:56.
1975.The second fifty Haworthias. The Succulent Plant Trust, England.
1978.Haworthia and Astroloba – a collectors guide.
RESENDE, FLAVIO.
1940.Haworthia marlothiana Marloth. Feddes Repertorium specierum novarum regni vegetabilis 48:114.
1940.Haworthia limifolia Marloth fa. marlothiana. Boletim da sociedade Broteriana 14:200.
1943.Succulentas africana 3. Memorias da sociedada Broteriana. 2:94
1946.Variability and taxonomy in the genus Haworthia. Portugalia acta biologica B :1.
RESENDE, FLAVIO and PINTO_LOPES, J.
1946.4.Contribution to a better geno-sistematic knowledge of the Coarctatae section of the genus Haworthia Duval. Portugalia acta biologica B 2:175.
RESENDE, FLAVIO and VON POELLNITZ, K.
1949.Variedades novas da Haworthia tessellata Haw. Broteria 11:49.
RESENDE, FLAVIO and ANTONIO, VIVEIROS.
1948.Caryological studies in the Aloinae. Portugalia acta biologica A 2:176.
RILEY, H.P.
1959.Polyploidy in Gasteria and Haworthia. Bulletin of the Torrey Botanical Club 86:81.
1968.Chromosomal interchanges and evolution in the Aloineae. In: Seminar on Chromosomes.
RILEY, H.P. and MUKERJEE, D
1962.Two aneuploid plants of Haworthia. Journal of Heredity 53:105.
1965.Some new chromosome studies in the Coarctatae and other sections of Haworthia. The Nucleus 8: 149.
RILEY, H.P. and ISBELL, C.J.
1963.Paper chromatographic studies in the Aloineae: 1. Preliminary observations on some species of Haworthia. Journal of South African Botany 29:59.
RILEY, H.P. and HOPKINS, J.D.
1964.Paper chromatographic studies in the Aloineae: 2. The Rigidae and Retusae sections of Haworthia. In: C.A. Leone, Taxonomic Biochemistry and Serology. Ronald Press, :255.
RILEY, H.P. and MAJUMDAR, S.K.
1965.Some polyploid plants of Haworthia. Canadian Journal of Genetics and Cytology 7:357.
1966.Chromosome studies of diploid and polyploid plants of Haworthia. Botanical Gazette 127:239.
1966.Cytogenetic studies of an aneuploid species of Haworthia with special reference to its origin. Journal of Cytology and Genetics. 1:46.
1966.Some further chromosome studies in Haworthia. American Journal of Botany 52:626.
1967.Heterochromatic segments in Haworthia and Gasteria at low temperature. Journal of Heredity 58:297.
1968.Three new chromosomal translocations in Haworthia. Canadian Journal of Genetics 10:487.
1980.The Aloineae. A biosystematic survey. University Press of Kentucky, Lexington.
RILEY, H.P., MAJUMDAR, S.K. and HAMMACK, R.E.
1966.A chromosome translocation in three Haworthia plants. Bulletin of the Association of Southeastern Biologists 13:45.
1967.Chromosomal translocations in three plants of the genus Haworthia. Canadian Journal of Genetics and Cytology 9:683.
1969.Meiosis in a triploid Haworthia with a chromosomal translocation. Journal of Heredity 60:255.
(Voucher specimens supporting most of Prof. Riley’s published chromosome counts are deposited in the Compton herbarium (NBI) at Kirstenbosch.)
ROBERTS, MEL.
1983.The genus Haworthia Duval: past and present. British Cactus and Succulent Journal 1:30.
ROWLEY, G.D.
1967.A numerical survey of the genera of Aloineae. Natn.Cactus Succul.J. 22:71
1976.Generic concepts in the Aloineae. Part 1. National Cactus and Succulent Journal 31:31. Part 2. Idem. 31:54.
SALM‑REIFFERSCHEID‑DYCK, J.
1817.Catalogue raisonne des Especes d ‘Aloes (see W.T. Stearn, The Cactus Journal 7:34, 1938).
1820.Observations botanicae (1820‑22).
1822.Index Plantarum succulentarum in Horto Dyckensi (1822 and 1829).
1834.Hortus Dyckensis.
1836.Monographia generum Aloes et Mesembryanthemi (1836‑42, 1849‑63).
SCHONLAND, S.
1910.On some points in the morphology and biology of a new species of Haworthia (H. truncata). Transactions of the Royal Society of South Africa. 1:391.
SCOTT, C.L.
1965.A new species of Haworthia. Journal of South African Botany 31:123.
1967.Haworthia maughanii V.Poelln. Cactus and Succulent Journal of Great Britain 29:26.
1968.A new species of Haworthia. Journal of South African Botany 34:1.
1970.A new species of Haworthia from the Eastern Cape. ibid. 36:287.
1973.A revision of the genus Haworthia, section Retusae. Aloe 11:8.
1976.The identity of Haworthia cymbiformis var. obtusa (Haw.) Baker and Haworthia pilifera Baker. Cactus and Succulent Journal (U.S.) 48:260.
1977.The identity of Haworthia arachnoidea (L.) Duval. ibid. 49:205.
1978.The correct application of the name Haworthia pumila (L.) Duval. Aloe 16:44.
1978.The identity of Haworthia arachnoidea (L.) Duval. ibid. 16:41.
1978.The reinstatement of relegated Haworthia species. Cactus and Succulent Journal (U.S.) 50:74.
1979.Haworthia altilinea Haw. National Cactus and Succulent Journal 34:53.
1979.A new species of Haworthia. Cactus and Succulent Journal (U.S.) 51:268.
1980.Diversity in the species Haworthia scabra Haw., and H. tuberculata V.Poelln. ibid. 52:274.
1980.Haworthia aristata Haw. National Cactus and Succulent Journal 35:11.
1980.Haworthia pearsonii C.H. Wright. Aloe 18:7.
1981.Haworthia reinwardtii Haw. National Cactus and Succulent Journal 36:36.
1981.Haworthia viscosa (L.) Duval. National Cactus and Succulent Journal 36:98.
1981.Some species of Haworthia in the Eastern Cape Province. Cactus and Succulent Journal (U.S.) 53:70.
1981.A new variety of Haworthia. ibid. 53:124.
1983.Haworthia mucronata Haw. British Cactus and Succulent Journal 1:97.
1984.A new species of Haworthia (Liliaceae – Aloineae) sect. -Retusae. Cactus and Succulent Journal (U.S.) 56:69.
1985.The Genus Haworthia, a taxonomic revision. Aloe Books.
1994.A new species of Haworthia, H. reddii. Cactus and Succulent Journal (U.S.) 66:182.
1994.A new species of Haworthia (Asphodelaceae) – H.pringlei. Bradleya 12:102.
1995.A new species of Haworthia (Asphodelaceae) – H.joeyae. Bradleya 13:80.
SCHNEIDER, Christel
1972.Anatomische Untersuchungen an den Blattern einiger Arten von Haworthia. A thesis for Botanical Institute, University of the Saarland.
SCHARGI, S
1972.Methods and techniques in micropropagation of Haworthia by tissue culture. A thesis for Louisiana State University and Agricultural College.
SMITH, G,F.
1989.Notes on Haworthia glabrata (Salm-Dyck) Baker. Aloe 26:18.
1990.Haworthia fasciata (Willd.) Haw. forma fasciata. Aloe 27:92.
1991.Populations of Haworthia fasciata are dwindling in urban Port Elizabeth, Eastern Cape, South Africa. British Cactus and Succulent Journal 9:42.
SMITH, G.F. and GREYLING, H.P.
1990.Neotypification of Aloe glabrata, basionym of Haworthia glabrata (Asphodelaceae: Alooideae). Taxon 39:331.
SMITH, G.F. and VAN WYK, B.
1991.Generic relationships in the Aloineae (Asphodelaceae). Taxon 40:557.
SMITH, G.F., STEYN, E.M.A., STEYN, C. and VAN WYK, A.E.
1996. Notes on the leaf anatomy of Chortolirion and Haworthia (Aloaceae). South African Journal of Botany.
SMITH, G.G.
1943.Some new species and varieties in the genus Haworthia: I. Journal of South African Botany 9:93.
1944.do. II and III. ibid. 10:137.
1945.do. IV. ibid. 11:65.
1946.do. V. ibid. 12: 1.
1948.do. VI. ibid. 14:41.
1948.Views on the naming of Haworthias. ibid. 14:55.
1950.Some transfers in the genus Haworthia. ibid. 16:1.
1950.Some new species and varieties in the genus Haworthia: VII. ibid. 16:3.
1950.A reply to Mr. Uitewaal. Cactus and Succulent Journal of Great Britain 12:64.
STEARN, W. T.
1938.An annotated index to Salm-Dyck’s Monographia Generum Aloes et Mesembryanthema. Cactus Journ.(GB) 7.:40.
1939.Plantae succulentae, in Hort Alenconia. Auctora H.A.Duval. ibid. 8:105.
TERBLANCHE, R.F., SMITH, G.F. and GREYLING, H.P.
1993.Did Scott typify names in Haworthia (Asphodelaceae: Alooideae)? Taxon 42:91.
TJADEN, WILL.
1985.A choice of name: Haworthia margaritifera or Haworthia pumila. British Cactus and Succulent Journal. 3:88.
TRIEBNER, W. and VON POELLNITZ, K.
1938.Haworthia planifolia Haw., Haworthia cymbiformis Haw. and Haworthia altilinea Haw. Feddes Repertorium specierum novarum regni vegetabilis 45:161.
1938.Haworthia triebneriana V.Poelln. ibid. 47:8.
UITEWAAL, A.J.A.
1938.Haworthia albicans and its varieties. Succulenta 20:140.
1939.A change of name for reasons of priority in the genus Haworthia. ibid. 21:40.
1939.Haworthia luteorosea Uitew. spec. nov. Cactussen en Vetplanten 5:88.
1939.Historical notes of the Aloineae. Succulenta ?:?.
1939.One new species of the genus Haworthia. Cactussen en Vetplanten 5:137.
1940.Haworthia marumiana Uitew. spec. nov. ibid. 6:33.
1940.Two known but undescribed Haworthias. ibid. 6:44.
1947.A first attempt to subdivide the genus Haworthia, based on floral characters. Desert Plant Life 19:133.
1947.Revision of the nomenclature of the genera Haworthia and Apicra. Succulenta 26: 51-54.
1948.Revision of the nomenclature of a few Haworthias II. ibid. ?:49.
1949.Views on the classification of Haworthias. Cactus and Succulent Journal of Great Britain 11:19.
1951.Today’s knowledge about the small‑flowering Aloineae. Sukkulentenkunde 4:91.
VENTER, J.D. and HAMMER, S.A.
1997.New and old species of Haworthia Duval from the Little Karoo. Cactus and Succulent Journal (U.S.) 69:75.
VON POELLNITZ, Karl
1929.Contribution to the knowledge of the genera Haworthia Duv. and Gasteria Duv. Feddes Repertorium specierum novarum regni vegetabilis 27:132.
1929.Haworthia schmidtiana V.Poelln. spec. nov. ibid. 26:23.
1930.Contribution to the knowledge of the genera Haworthia Duv. and Gasteria Duv. ibid. 25:101.
1932.do. ibid. 31:82.
1933.Haworthia starkiana V.Poelln. spec. nov. ibid. 33:73.
1933.Three new Haworthia species. ibid. 33:239.
1935.One new Haworthia species: H. maraisii. ibid. 38:194.
1936.Contribution to the knowledge of the genus Haworthia Duv. ibid. 40:148.
1936.Key to the genus Haworthia Duval. The Cactus Journal 5:28.
1936.New Haworthia species. Kakteenkunde 10:89.
1937.Contribution to the knowledge of the genus Haworthia Duv. Feddes Repertorium specierum novarum regni vegetabilis 41:193.
1937.Four new species of Haworthia. ibid. 42:269.
1937.Five little known species of the genus Haworthia Duval. Desert Plant Life 9:90.
1937.Four little known South African succulent plants. ibid. ?:33.
1937.Four new Haworthia species. Kakteenkunde 10:152.
1937.Haworthia attenuata Haw. Kakteen und andere Sukkulenten 10:165.
1937.Haworthia schmidtiana and related forms. ibid. 10: 168.
1937.New species and varieties of the genus Haworthia Duval. The Cactus Journal 6:18.
1937.New species in the genus Haworthia Duval. Kakteenkunde 9:132.
1937.Six new species of Haworthia Duval. Desert Plant Life 9:100.
1938.Concerning the sections in the genus Haworthia Duv. Feddes Repertorium specierum novarum regni vegetabilis 44:200.
1938.Contribution to the knowledge of the genus Haworthia Duv. ibid. 43:92.
1938.Haworthia Duv.: Scabrae Berger, Retusae Haw. and Coarctatae Berger. ibid. 43:98.
1938.Haworthia fasciata (Willd.) Haw. and related forms. ibid. 43:94.
1938.Haworthia fasciata (Willd.) Haw. The Cactus Journal 6:?.
1938.Haworthia planifolia Haw. and Haworthia perplexa V.Poelln. Kakteenkunde 53-54 cont. Kakteenkunde 6:67.
1938.Haworthia tuberculata V.Poelln and its varieties. The Cactus Journal 7:56-57
1938.Haworthia woolleyii V.Poelln. ibid. 7:3..
1938.Four new species of Haworthia Duval. Desert Plant Life 11:192.
1938.New forms in the genus Haworthia Duv. Feddes Repertorium specierum novarum regni vegetabilis 44:132.
1938.Two new species of Haworthia Duv. Kakteenkunde 7:75.
1939.A new species of Haworthia. Cactussen en Vetplanten 5:115.
1939.Three new forms of the genus Haworthia Duval. Desert Plant Life 2:8.
1939.Two unusual Haworthia species. Beitrage zur Sukkulentenkunde und ‑Pflege 1:45.
1939.Two new Haworthia species. Feddes Repertorium specierum novarum regni vegetabilis 46:271.
1940.Concerning Haworthia Duval. ibid. 49:23.
1940.Two new Haworthia species. ibid. 49:57.
1940.Haworthia reinwardtii Haw. Beitrage zur Sukkulentenkunde und ‑Pflege 2:41.
VOSA, C. and BAYER, M.B.
1981.Chromosome studies in the South African Flora: 10-21. Journal of South African Botany 47:687.
1986.Chromosome studies in the South African Flora: 38-57. Caryologia 39:325
WESSELS, D.C.J., GROENEWALD, E.G. and KOELEMAN, A.
1976.Callus formation and subsequent shoot and root development from leaf tissue of Haworthia planifolia cf. var. setulifera V.Poelln. Zeitschrift fur Pflanzenphysiologie 78:141.
ZANTNER, A
1937.Interesting African leaf succulents. Kakteen und andere Sukkulenten 10:170.
1942.do. Beitrage zur Sukkulentenkunde und ‑Pflege 1:13.
1947.Interesting leaf succulents. Sukkulentenkunde 1:40.
1951.Rare, interesting Haworthia species. ibid. 4:94.
WIJNANDS, D.O.
1984.Haworthia margaritifera (L.) Haw. niet Haworthia pumila (L.) Duval. Succulenta 10:230.
WHICHER, PAUL,
1993.Problems of synonymy in the genus Haworthia. British Cactus and Succulent Journal 11:12.
ZANTNER, A. and VON POELLNITZ, K.
1938.One new Haworthia species. Feddes Repertorium specierum novarum regni vegetabilis 43:232.