Leon De La Luz, Jose Luis; Coria Benet, Rocio; Cruz Estrada, Minerva
July 1996
Acta Botanica Mexicana;1996, Issue 35, p45
Academic Journal
A flowering phenology study was carried out in a plant community close to the Gulf of California coast in the southern part of Baja California Sur, Mexico. The area is located on the border between two phytographical provinces: the Cape Region of arid-tropical features and the Sonoran Desert. Among several characteristics, the site presents a bimodal rain pattern, the maxima corresponding to the late summer and winter seasons. For two years the presence-absence of flowers of 136 species of vascular plants were registered in an area of 200 hectares. Species were grouped according to their life forms in: 13 trees; 46 shrubs, 52 herbs (37 annuals, and 15 perennials), 11 succulents, 11 climbing vines and 3 parasites. The same taxa were grouped according to their flowering response in three classes: a) flowering induced by the rainy season (60); b) flowering in the dry season (46); and c) species of irregular or maintained flowering pattern (30). The flowering spectrum obtained from two years of observation shows that the woody species, as a group, exhibit flowers all the year. Flower synchrony at the study site seems to be less pronounced than that reported from a subtropical plant community on the near coast of mainland Mexico.


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