Open Access. Powered by Scholars. Published by Universities.®
- Discipline
Articles 1 - 5 of 5
Full-Text Articles in Life Sciences
Rarity In Astragalus: A California Perspective, Philip W. Rundel, Thomas R. Huggins, Barry A. Prigge, M. Rasoul Sharifi
Rarity In Astragalus: A California Perspective, Philip W. Rundel, Thomas R. Huggins, Barry A. Prigge, M. Rasoul Sharifi
Aliso: A Journal of Systematic and Floristic Botany
Astragalus (Fabaceae), the largest genus of plants in the world with an estimated 3270 species, is known for large numbers of rare endemic species. An inventory of patterns of climatic, topographic, and edaphic diversity of Astragalus taxa in California (98 native species and 144 named taxa) provides a means to understand the occurrence of rarity in relation to climatic equitability and regional species richness of congeneric taxa. Most taxa in the genus have relatively small ranges of distribution, with 50% restricted geographically to a single Jepson Bioregion. The California Native Plant Society lists 51 Astragalus taxa (35% of the native …
Ecophysiological Observations On Lane Mountain Milkvetch, Astragalus Jaegerianus (Fabaceae), A Proposed Endangered Species Of The Mojave Desert, Arthur C. Gibson, M. Rasoul Sharifi, Philip W. Rundel
Ecophysiological Observations On Lane Mountain Milkvetch, Astragalus Jaegerianus (Fabaceae), A Proposed Endangered Species Of The Mojave Desert, Arthur C. Gibson, M. Rasoul Sharifi, Philip W. Rundel
Aliso: A Journal of Systematic and Floristic Botany
Astragalus jaegerianus, the Lane Mountain milkvetch, a perennial herbaceous legume, is a rare and very narrow endemic of the central Mojave Desert in San Bernardino County, California, and currently proposed to be listed as an endangered species. This herb grows in the protection of low shrubs. Anatomical observations revealed that leaflets are amphistomatic and have isolateral mesophyll, typical of full-sun desert leaves, and the green stem is an important photosynthetic organ, having abundant stomata and a cylinder of cortical chlore nchyma. Ecophysiological studies showed that this species requires high PFD (1400-1500 μmol m-2s-1) to achieve …
Petiolar Anatomy Of North American Astragalus Species (Fabaceae) With Persistent Petioles, Thomas Engel
Petiolar Anatomy Of North American Astragalus Species (Fabaceae) With Persistent Petioles, Thomas Engel
Aliso: A Journal of Systematic and Floristic Botany
The petiole and rachis anatomy of 11 North American Astragalus species that show a tendency towards persistent petioles is described and illustrated by line drawings of representative transections. The results are compared with those of a spine anatomical survey of 200 Old World Astragalus and Astracantha species. Attention was given to the anatomical characters previously determined to be taxon-specific such as the amount and position of sclerenchyma and distribution patterns of vascular bundles. Character evolution and the classification of species into sections are discussed. A fundamental difference between New World and Old World Astragalus s.1. species was found. Most of …
Astralagus Ertterae (Fabaceae), A New Species From The Southern Sierra Nevada, Rupert C. Barneby, James R. Shevock
Astralagus Ertterae (Fabaceae), A New Species From The Southern Sierra Nevada, Rupert C. Barneby, James R. Shevock
Aliso: A Journal of Systematic and Floristic Botany
Astragalus ertterae, a new species from pinyon pine woodlands, southern Sierra Nevada, Kern County, California, is described and illustrated. This remarkable new species is morphologically closest to A. bicristatus in sect. Bicristati but differs in its dwarf stature, pilose indumentum, short peduncles, somewhat smaller flowers, and especially in a pod only half as long and proportionately twice as plump.
More New Astragali From Turkey, Kit Tan, F. Sorger
More New Astragali From Turkey, Kit Tan, F. Sorger
Aliso: A Journal of Systematic and Floristic Botany
Nine new species of Astragalus representing four sections of the genus are described from central, south and east Anatolia and illustrated.