The vascular flora and vegetation of granitic outcrops in the upper Cordoba mountains, Argentina
Cabido, M.; Acosta, A.; Diaz, S.
Granitic outcrop plant communities and flora in the mountains of Córdoba, Argentina, above 1900 m altitude are described. The outcrops studied present a peculiar set of environmental conditions to which a unique assemblage of species is associated. A total of 145 species is recorded including 125 angiosperms, 13 pteridophytes and 7 non-vascular species. Four plant communities are distinguished on the basis of species groups distribution. Two of them are dominated by shrubs (Berberis hieronymi and Satureja odora; Heterothalamus alienus and Croton argentinus) while the two others are integrated mainly by herb species (Sorghastrum pellitum and Stipa flexibarbata; Crassula peduncularis and Limosella lineata). Both shrub communities are restricted to larger outcrops with more stable conditions and deeper soils between the granitic blocks. The Sorghastrum pellitum-Stipa flexibarbata community inhabits smaller outcrops, with scarce or no soil development which are almost continually exposed to solar radiation. The Crassula peduncularis-Limosella lineata community occurs in granitic depressions where water collects after rainstorms and persists for only a few days. Some floristic relations with other outcrop habitats are discussed.