Notes on the Distribution of the Genera Micro Paracaryum and Paracaryum (Boraginaceae) in Saudi Arabia PDF

Keywords

Micro paracaryum, paracaryum, Saudi Arabia

Abstract

Collections in the Arabian Peninsula revealed that Paracaryum rugulosum and Micro paracaryum intermedium- outstanding taxa of the Irano-Turanian polymorphic Mattiastrum- Paracaryum complex- are able to penetrate southwards into the western part of the Arabian Peninsula. M. intermedium, in particular is frequent in the isolated mountains of Hisma Midyan and al- Hijaz. Due to the heteromericarpy of M. intermedium (2-3 winged nutlets and 1 (-2) glochidiate, wingless nutlets) and the differentiation of flat and inflated margins within the winged type (mattiastroid, paracaryoid forms), the species is able to colonize suitable biotopes in the isolated mountains. Within the m. intermedium complex a dispersal strategy is realized, combining the Annual shuttle strategy (telechorous strategy) with an Annual stayer strategy (atelechorous strategy).