| 词条 | Astragalus jaegerianus |
| 释义 |
|image = Astragalusjaegerianus.jpg |status = LE |status_system = ESA |genus = Astragalus |species = jaegerianus |authority = Munz }}Astragalus jaegerianus is a rare species of milkvetch known by the common name Lane Mountain milkvetch. The plant was named for the biologist Edmund Jaeger, who first documented it in 1939.[1] DistributionIt is endemic to northeastern San Bernardino County, California, where it is known from only four populations in the vicinity of Fort Irwin in the Mojave Desert.[1] It is a federally listed endangered species.[1] DescriptionThis is a perennial herb with thin stems coated in scaly hairs. The stems reach 30 to 70 centimeters in length and grow tangled in the herbage of adjacent shrubs. In dry years the plant grows only a few centimeters long before flowering, but after abundant rain it may climb to the tops of neighboring shrubs.[1] The leaves are 2 to 5 centimeters long and are made up of several widely spaced narrow leaflets with hairy upper surfaces. The inflorescence is an open array of up to 15 pale purple, dark veined flowers. Each flower is up to one centimeter in length. The flowers are insect-pollinated, with the most common pollinator being the megachilid bee Anthidium dammersi.[1][2] The fruit is a hanging legume pod up to 2.5 centimeters long. It is hairless and dries to a leathery or thick papery texture. References1. ^1 2 3 4 Charlton, David. (2007). Determining the population boundaries of a narrowly endemic perennial plant, Lane Mountain milk-vetch, in San Bernardino County, California. Charis Corporation, Bartsow, CA, for the USDA Forest Service. 2. ^US Army. (2003). Lane Mountain Milkvetch Pollination Survey {{Webarchive|url=https://web.archive.org/web/20110711020539/http://www.fortirwinlandexpansion.com/SDEIS_Docs/Milkvetch/Pollination/Pollination%20Report_Part4.pdf |date=2011-07-11 }}. Part 4. External links
4 : Astragalus|Endemic flora of California|Natural history of the Mojave Desert|NatureServe critically imperiled species |
| 随便看 |
|
开放百科全书收录14589846条英语、德语、日语等多语种百科知识，基本涵盖了大多数领域的百科知识，是一部内容自由、开放的电子版国际百科全书。