Abstract
Several processes related to the reproductive biology of the Iberian species of the genus Potentilla L. subg. Trichothalamus (Spreng.) Rchb., Comarum (L.) Syme and Fragariastrum (Heist. ex Fabr.) Rchb. are studied. We provide data concerning compatibility, agamospermy and hybridization along with pollination and fruit dispersal. No agamospermy mechanisms were found in any of the taxa, nor were there signs of any hybridization, although potential signs of self-incompatibility were detected. Regarding to pollination, a marked tendency toward autogamy was observed in certain groups. Finally, some mechanisms for the release and dispersal of diaspores are described in relation to diaspore and flower receptacle morphology.
Highlights
The genus Potentilla L. is a complex group including over 300 species mainly distributed on the temperate regions of the northern hemisphere
The present paper focuses on the following species (Fig. 1a-h) of the subgenus Fragariastrum: P. caulescens L., P. nivalis Lapeyr., P. alchimilloides Lapeyr., P. montana Brot., P. sterilis (L.) Garcke, and P. micrantha Ramond ex DC.; it includes P. fruticosa and P. palustris, the only Iberian representatives of the subg
The self-incompatibility of P. fruticosa has already been demonstrated by Davidson & Lenz (1989), and according to these authors it may be of genetic origin
Summary
The genus Potentilla L. is a complex group including over 300 species mainly distributed on the temperate regions of the northern hemisphere. The extreme variability of some of its characters makes it a highly polymorphic genus; some of its species have a rather uncertain taxonomic position which is partly attributable to the existence of intra- and interspecific hybridization processes and apomictic phenomena. Hybridization has been mainly described on taxa of subg. (Eriksen, 1996) or P. nivea L. and P. crantzii (Crantz) G. Beck (Eriksen & Popp, 2000). According to Guillén & Rico (1998) there are 30 species of Potentilla in the Iberian Peninsula, pertaining to 4 subgenera: Trichothalamus (Spreng.) Rchb., Comarum (L.) Syme, Anales del Jardín Botánico de Madrid 62(1) 2005
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