Nomenclature and redescription of the Jaumave Valley (Mexico) populations of Astrophytum myriostigma (Cactaceae)
DOI:
https://doi.org/10.17348/jbrit.v13.i1.826Abstract
Astrophytum myriostigma Lem. subsp. quadricostatum (H. Moller) K. Kayser and Astrophytum myriostigma Lem. subsp. tamaulipense K. Kayser are both validly published names, but the subspecific epithet quadricostatum has priority (published in 1927) over tamaulipense (published in 1932) and is, therefore, the correct name for the Jaumave Valley Bishop’s Cap. The Jaumave Valley populations have differentiated from subsp. myriostigma in several morphological characters. Both taxa have distinctly different stem morphology as seedlings but become similar in early maturity, although older Jaumave plants are usually slightly taller and more slender than subsp. myriostigma. As seedlings several years of age, the Jaumave plants have a slender, elongate stem resembling that of subsp. tulense K. Kayser, but they differ from both subsp. myriostigma and subsp. tulense in having black spines up to 4 mm long. The flowers of subsp. quadricostatum are slightly smaller and have fewer tepal rows than those of subsp. myriostigma. The smallest flowers, with one or two tepal rows, are typically found in subsp. tulense. Further comparisons among the three taxa must await the completion of studies now in progress.
Literaturhinweise
Backeberg, C. 1961. Die Cactaceae. Vol. 5. VEB Gustav Fischer Verlag, Jena, Germany.
Baum, H. 1933. Echinocactus (Astr.) myriostigma Lem. v. quadricostatus Möll. Kakteenkunde 11:205.
Frank, G. 1963. Gedanken zum Artenproblem. Kakteen And. Sukk. 14(11):206–207.
Gilkey, J.E. 1944. The Astrophytum Group. J. Cact. Succ. Soc. Amer. 16(10):143–150.
Haage, W. & O. Sadovský. 1957. Kakteen-Sterne, Die Astrophyten. Neumann Verlag, Radebeul, [German Democratic Republic].
Haage, W. 1981. Kakteen von A bis Z. Neumann Verlag, Leipzig–Radebeul, Germany.
Hoock, H. 1990. The Myriostigmas of San Antonio. Brit. Cactus Succ. J. 8(3):68–73.
Hoock, H. 2008. Astrophytum Lem. (Cactaceae). Schoendruck-media e. K., Landshut, Germany.
Houghton, A.D. 1930. Tentative key to the genus Astrophytum. J. Cact. Succ. Soc. Amer. 1(8):157.
Kayser, K. 1932. Astrophytum myriostigma subspecies Tulense. Kakteen-Freund 1(6):57–59.
Kleszewski, K.P. 1997. Astrophyten im Jaumave-Tal. Kaktusblüte Verein der Kakteenfreunde Mainz/Wiesb. u. Umgebung. OG Rhein-Main-Taunus:43–46.
Kleszewski, K.P. & H. Hoock. 2007. Il Genere/Die Gattung Astróphytum Lemaire. Piante Grasse Suppl. 1/2007:1–99.
Kleszewski, K. P. 2010. Bischofsmützen-Sternpflanzen. Die Gattung Astrophytum. Deutsche Kakteen–Gesellschaft e. V., Pforzheim, Germany.
Kleszewski, K.P. 2018. Dornenbildung bei Astrophytum myriostigma subsp. tamaulipensis. Kakteen And. Sukk. 69(3):89–92.
Megata, M. 1944. An account of the genus Astrophytum Lemaire. Mem. Coll. Agric., Kyoto Imperial Univ. 56:1–62.
Moeller, A.F. 1930. Astrophytum myriostigma. J. Cact. Succ. Soc. Amer. 1(8):156–157.
Moeller, H. 1927. Beobachtungen an Astrophyten. Z. Sukkulentenk. 3(3):52–54.
Sadovský, O. & B. Schütz. 1979. Die Gattung Astrophytum. Arten. Hybriden. Kultur. Flora–Verlag, Titisee–Neustadt, Germany.
Sato, T. 1994. Astrophytum Hand Book. Vol. 2. Myriostigma family. Japan Cactus Planning Co. Press, Fukushima, Japan.
Schätzle, P. 1993. Die Astrophyten des Jaumavetales. Teil 1. Kakteen And. Sukk. 44(6):128–131.
Schätzle, P. 1994. Die Astrophyten des Jaumavetales. Teil 2. Kakteen And. Sukk. 45(7):130–132.
Turland, N.J., J.H. Wiersema, F.R. Barrie, W. Greuter, D.L. Hawksworth, P.S. Herendeen, S. Knapp, W.-H. Kusber, D.-Z. Li, K. Marhold, T.W. May, J. McNeill, A.M. Monro, J. Prado, M.J. Price, & G.F. Smith, eds. 2018: International code of nomenclature for algae, fungi, and plants (Shenzhen Code) adopted by the Nineteenth International Botanical Congress Shenzhen, China, July 2017. Regnum Veg. 159. Glashütten: Koeltz Botanical Books. DOI https://doi.org/10.12705/Code.2018.
Viereck, H.W. 1939. Astrophyten, wie sie der Sammler in den Heimatgebieten sieht. Beitr. Sukkulentenk. Sukkulentenpflege 1:4–8.
Walton, F.A. 1899. The Cactus Journal. Vol. 2. London, England.
