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POLLEN MORPHOLOGY, TRICHOME TYPES, AND RELATIONSHIPS OF THE GRONOVIOIDEAE (LOASACEAE)
Author(s) -
Poston Muriel E.,
Nowicke Joan W.
Publication year - 1993
Publication title -
american journal of botany
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.218
H-Index - 151
eISSN - 1537-2197
pISSN - 0002-9122
DOI - 10.1002/j.1537-2197.1993.tb15239.x
Subject(s) - biology , pollen , reticulate , subfamily , trichome , cladistics , evolutionary biology , botany , sister group , morphology (biology) , zoology , phylogenetics , clade , genetics , gene
The pollen of all four genera of Gronovioideae— Cevallia, Fuertesia, Gronovia , and Petalonyx— was examined in light microscopy, and scanning and transmission electron microscopy. The pollen of Cevallia , of Fuertesia , and of Gronovia can be easily distinguished from each other and from all remaining Loasaceae. Only Petalonyx , with a striate tectum, shows a clear relationship to the Mentzelioideae and Loasoideae, the vast majority of which have striate‐reticulate or striate tecta. The trichome data are mostly congruent with the pollen data: Cevallia, Fuertesia , and Gronovia each have a distinctive trichome not known to occur elsewhere in the family, while Petalonyx has only the common types. A cladistic analysis of Gronovioideae utilizing Mentzelia as the outgroup proposes that Cevallia, Gronovia , and Fuertesia are a sister group to Petalonyx within the subfamily. The relationships of the four genera to each other and of Gronovioideae to the Loasaceae are discussed.