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Pyrene and pollen observations in the pantropical genus Geophila (Rubiaceae‐Psychotrieae)
Author(s) -
Piesschaert F.,
Robbrecht E.,
Poulsen A. D.,
Smets E.
Publication year - 1999
Publication title -
nordic journal of botany
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.333
H-Index - 33
eISSN - 1756-1051
pISSN - 0107-055X
DOI - 10.1111/j.1756-1051.1999.tb01906.x
Subject(s) - pantropical , biology , pollen , botany , genus , rubiaceae , repens
Pyrene and pollen morphology of several neo‐ and paleotropical Geophila species is documented and discussed. Pyrenes show distinct morphological variation. They have one central or several adaxial ribs and are straight or twisted. Neotropical species only have twisted pyrenes, whereas Madagascan species have straight ones. Both pyrene types occur on the tropical African mainland and in tropical Asia. The genus is eurypalynous, including inaperturate, colpate and pantoporate pollen. The paper includes the first record of operculate pollen in the Rubiaceae, viz. in Geophila repens var. repens . Pyrenes as well as pollen morphology indicate that the varieties of the pantropical species G. repens need recognition at the specific level.