Die Erstbeschreibung (1998)

Acharagma (Taylor) Ch. Glass, Guía Identific. Cact. Amenazadas México, 1: Ac/ag, 1998, pub. 1997

Beschreibung:





Basionym

Escobaria sect. Acharagma Taylor sect. nov., Kakteen und andere Sukkulenten, 34: 185, 1983

Beschreibung: a sect. Escobaria sulco tuberculari nullo, perianthii segmentis eciliatis distincta.
Typ: Echinocactus roseanus Boedeker
Synonym: Escobaria subg. Primibaria V. John et Riha in Kaktusy 17: 41 (1981)

Diese Artenpaar (Esc. roseana a Esc. aguirreana) wird vom Rest der Gattung Escobaria durch das Fehlen einer Warzenfurche bei Blühreife unterschieden. Es scheint sich um stark neotäne Taxa zu handeln, welche die Blühreife erreichen, bevor sie das Sämlingsstadium abgeschlossen haben; das Fehlen einer Warzenfurche ist charakteristisch für den (unreifen) Sämlingszustand bei anderen Arten der Gattung.




Die andere Beschreibungen der Gattung


Acharagma (Taylor) Ch. Glass
E. F. Anderson, The Cactus Family, p. 108, Timber Press Portland, Oregon, 2001

Beschreibung: Subfamily Cactoideae, tribe Cacteae. Plants usually solitary but sometimes forming small clusters. Stems globose to short cylindrical, without nectar-secreting glands, 3-7 cm (1.2-2.8 in) in diameter. Ribs present, more or less forming tubercles. Areoles borne on the rib tips, without grooves. Spines present, usually dense. Flowers borne at the stem tips, cream colored to pink to reddish yellow to yellow, 1.5-2 cm (0.6-0.8 in) long and in diameter; floral tubes short; perianth parts not ciliate. Fruits club shaped, green to purplish bronze, 10-20 mm (0.4-0.8 in) long. Seeds brown to black, pitted.

Basionym: Escobaria sect. Acharagma N. P. Taylor, 1983.

Vorkommen: Mexico (Coahuila and Nuevo León)

Typus: Acharagma roseana   (Boed) Anderson   
(syn: Echinocactus roseanus   Boedeker)




Acharagma (Taylor) Ch. Glass
D.R.Hunt, N.P.Taylor, G.Charles, The New Cactus Lexicon, p. 26, DH Books, 2006

Beschreibung: Habit small, simple or clustering, globose to short-cylindric, tuberculate; tubercles pyramidal-conic, groove absent or short; areoles apical, not bipartite, eglandular; spines numerous, subsimilar; flowers apical on nascent tubercles, small, funnelform; outer tepals eciliate; stigma pale yellow; fruit berry-like, naked, indehiscent; perianth remnant persistent; seeds brown or black-brown; testa Mammillaria-type, deeply pitted (par-concave).

Formerly included in Escobaria, but gene sequence studies suggest it belongs in a well-supported clade with Lophophora and Obregonia (Butterworth et Wallace /1999/: Phylogenetic studies of the tribe Cacteae, Cactaceae Consensus Initiatives, 8: 8)

Basionym: Escobaria sect. Acharagma Taylor, 1983.

Etymology: From Greek, a, without, charagma [gender: ,n.], groove.

Distribution: Mexico (Coahuila and adjacent Nuevo León)

Typus: Acharagma roseanus   (Boed) Anderson   
(syn: Echinocactus roseanus   Boedeker)




 

ornament

© 2002-2008   Jan Mynar

Last modified June 8, 2008

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