Browse by
Summary Table
Presenting Author
All Authors
Title
Keywords
Institution
Program/Schedule
Date/Time
Programs
Sessions
Locations
At-A-Glance
or
Search
Home
Login

Abstract Detail


Rupert Barneby and his legume legacy

Porter, J. Mark [1], Hobbs, Susan [1], Mistretta, Orlando [1].

Natural history of Peirson.

Astragalus magdalenae var. peirsonii, a federally listed, threatened species, is restricted to the Algodones (Imperial) Dunes, California and Gran Desierto region, Sonora. In spite of the exceptional controversy surrounding this federally protected species, little is known regarding the life history and reproductive biology of this taxon. Between December 2001 and December 2003 field and greenhouse investigations were conducted to investigate 1) duration, 2) breeding system, and 3) pollination biology of Peirson's milkvetch. These studies indicate that Astragalus magdalenae var. peirsonii is an obligate outcrossing species, possessing self-incompatibility. Primary pollen transfer is effected by Habropoda sp. and Bembix sp., insect species restricted to dune habitats. To a lesser degree, some pollination may also be due to solitary bees (families Halictiaeae and Magachilidae) and beefly (family Bombyliidae). Peirsonís milkvetch is a short-lived perennial with a dimorphic duration strategy. One morph produces flowers within four months of germination; the other delays flowering for nine to twelve months.


1 - Rancho Santa Ana Botanical Garden, 1500 North College Avenue, Claremont, California, 91711-3157, USA

Keywords:
Astragalus
breeding system
life history
endemic
threatened species
self-incompatibility.

Presentation Type: Symposium
Session: 19-9
Location: Magpie (Cliff Lodge)
Date: Monday, August 2nd, 2004
Time: 4:15 PM
Abstract ID:890


Copyright © 2000-2004, Botanical Society of America. All rights reserved.
l>