AREOLE DIMORPHISM IN CORYPHANTHA
1961; Wiley; Volume: 48; Issue: 7 Linguagem: Inglês
10.1002/j.1537-2197.1961.tb11686.x
ISSN1537-2197
Autores Tópico(s)Plant and animal studies
ResumoB oke , N orman H. (U. Oklahoma, Norman.) Areole dimorphism in Coryphantha. Amer. Jour. Bot. 48(7): 593–603. Illus. 1961.— Coryphantha clava and C. erecta have both grooved and grooveless tubercles. The latter occur on young plants and emergent branches and may occur mixed with grooved tubercles on adult shoots, especially in C. erecta. Grooved tubercles have monomorphic areoles and are the only ones which bear flowers. The dimorphic areoles on grooveless tubercles develop exactly as in the mammillarias. In both species capitate glands occur in the axils of most tubercles and may occur at any position along an areole groove. The glands are initiated by the areole meristem in the same manner as spines, with which they are homologous. Close relationship between the 2 species is substantiated by both ectomorphic and endomorphic characters. The possession of both monomorphic and dimorphic areoles may mean that these cacti are evolving toward the complete areole dimorphism manifested by the mammillarias.
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