| 词条 | Brodiaea filifolia |
| 释义 |
|taxon = Brodiaea filifolia |image = Brodiaeafilifolia.jpg |status = LT |status_system = ESA |authority = S.Wats. |synonyms = Hookera filifolia}} Brodiaea filifolia, known by the common name threadleaf brodiaea, is a rare species of flowering plant in the cluster-lily genus . It is endemic to southern California, mostly in the region around the junction of Orange, Riverside, and San Diego Counties. The bulb is a resident of scattered remaining vernal pool and grassland habitats. It is a federally listed threatened species and it is listed as an endangered species on the state level. DescriptionBrodiaea filifolia is a perennial producing an inflorescence 20 to 30 centimeters tall which bears bright purple flowers. Each flower has six spreading tepals 1 to 1.5 centimeters long with a center containing three stamens and narrow or small staminodes, which are flat sterile stamens lying against the tepals. ConservationThis plant occurs in grassland areas, often in floodplains, and it is a member of the local vernal pool flora.[1] It requires heavy clay soils.[1] This type of habitat is becoming very rare as it is being cleared for development, especially as residential areas expand.[1] Undeveloped land near residential areas is degraded by exotic vegetation, mowing and other fire suppression efforts, sewage dumping, grazing of livestock, off-road vehicle use, and other processes.[1][2] The plant is also at risk for reduced genetic variability. It often reproduces vegetatively by producing new corms, a method of cloning which does not produce individuals with new combinations of genes.[1] When the plant does reproduce sexually, it requires unrelated individuals which have different genes; it cannot fertilize itself, nor can it successfully reproduce with closely related individuals.[1] Small population sizes that have low genetic diversity and wide distances between populations make it less likely the plant will successfully undergo sexual reproduction.[1][2] The plant sometimes hybridizes with Brodiaea orcuttii.[2] There are about 68 occurrences remaining in widely spaced locations between the San Gabriel Mountains and west-central San Diego County.[2] Several occurrences have been discovered since the plant joined the endangered species list, including locations on Camp Pendleton, and a few have been extirpated.[2] References1. ^1 2 3 4 5 6 The Nature Conservancy 2. ^1 2 3 4 USFWS. Five-year Review: B. filifolia. August 13, 2009. External links
6 : Brodiaea|Endemic flora of California|Natural history of the California chaparral and woodlands|Natural history of the Peninsular Ranges|NatureServe imperiled species|Threatened flora of California |
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