POLLEN CHARACTERISTICS OF THE TRIBES CALYCOPHYLLEAE, CINCHONEAE, AND HILLIEAE (RUBIACEAE)

被引:17
作者
ANDERSSON, L [1 ]
机构
[1] UNIV GOTHENBURG,DEPT SYSTEMAT BOT,S-41319 GOTHENBURG,SWEDEN
关键词
D O I
10.1111/j.1756-1051.1993.tb00072.x
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
Pollen grains were studied on acetolysed material with the aid of the SEM. They may be classified into four types. Type I is characterized by thick (0.9-2.1 mum) exine with reticulate surface, by distinct colpi with acute ends, and by distinct ora. It occurs in the genera Alseis, Calycophyllum, Ferdinandusa, and Schizocalyx. Ferdinandusa is further characterized by its lumina being differentiated into two distinct size classes. Type II is characterized by a usually thin (usually 0.7-1.1 mum) exine with foveolate surface, by distinct colpi with obtuse to truncate ends, and by poorly demarcated ora. It occurs in Cinchona, Joosia, Ladenbergia, and Remijia. Pollen grains of Joosia are mostly 4-colporate. Type III is characterized by a thick (1.7-2.0 mum) exine with coarsely reticulate surface, colpi are lacking or short and the ora are clearly demarcated. It occurs only in Capirona. Type IV is characterized by a thin (0.5-0.8 mum) exine with a psilate or foveolate surface and usually indistinct colpi with obtuse ends, and by distinct ora. It occurs in Cosmibuena and Dolicholobium. Pollen grains of Balmea, Hillia, Macrocnemum, Stilpnophyllum, and Wittmackanthus, combining features of Type I and II, do not fit into either of these four groups. It is concluded that both the tribes Calycophylleae and Cinchoneae remain eurypalynous in spite of a recent emendation. It is suggested that pollen characters serve best to characterize genera and small groups of genera. It is further suggested that Type I pollen is plesiomorphic in most or all characteristics.
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页码:405 / 417
页数:13
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