Pollen morphology ofCoffeaandPsilanthus(Rubiaceae‐Coffeeae), mainly from Africa
作者:
Piet Stoffelen,
Elmar Robbrecht,
Erik Smets,
期刊:
Grana
(Taylor Available online 1997)
卷期:
Volume 36,
issue 6
页码: 313-327
ISSN:0017-3134
年代: 1997
DOI:10.1080/00173139709362625
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
Twenty‐sixCoffeaand sixPsilanthusspecies are examined to provide a survey of the pollen morphological variation of the African Coffeeae. These observations are compared with data from literature and evaluated by numerical analysis. The latter corroborates that the two genera are distinguishable on the basis of pollen morphology.Coffeagrains are generally 3‐colporate, whilePsilanthusmostly has 4–5‐colporate grains. InCoffeamany species show a surprisingly high degree of pollen polymorphism. There is no doubt that this phenomenon is at least in part responsible for the poor taxonomic value of pollen features at the specific level, in this genus. As regardsPsilanthusour results seem to indicate pollen morphological differences between African (more narrow muri; no supratectal ornamentation) and Asian species (muri wider; supratectal granules), but this should be confirmed by investigating more species. This is in contradiction to the actual division in subg.Psilanthusand subg.Afrocoffea.
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