Floral ontogeny and systematic position of the Didiereaceae

被引:11
|
作者
Erbar, C. [1 ]
Leins, P. [1 ]
机构
[1] Heidelberg Univ, HIP Biodivers & Pflanzensystemat, Heidelberg, Germany
关键词
Caryophyllales; Didiereaceae; floral development; paraphyletic Portulacaceae; perianth; androecium;
D O I
10.1007/s00606-006-0432-y
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
Floral ontogenetical data from all four genera of the Didiereaceae (s.str.) are presented for the first time. All Didiereaceae s.str. are dioecious, having unisexual flowers with organ rudiments of the opposite sex. Two median bracts followed by a tetramerous perianth (two alternating dimerous ''whorls''), a slightly complex androecium with 6-12 stamens in a single row (on a common ring primordium), four of which mostly alternating with the perianth members, and one basal ovule connecting three free septa at their very base are flower characters in Didiereaceae, supporting phylogenetic analyses based on nucleotide sequence data. Closest relatives are the (formerly) portulacaceous genera Portulacaria (5 stamens alternating with the perianth), Ceraria (5 stamens alternating with the perianth), and Calyptrotheca (many stamens), all with pentamerous perianths, from which the tetramerous perianth in Didiereaceae can be derived. Applequist and Wallace (2003) included these three genera in an expanded family Didiereaceae (with three subfamilies).
引用
收藏
页码:165 / 185
页数:21
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