| 词条 | Polemonium pectinatum |
| 释义 |
|status = G2 |status_system = TNC |genus = Polemonium |species = pectinatum |authority = Greene }}Polemonium pectinatum is a species of flowering plant in the phlox family known by the common names Washington Jacob's-ladder and Washington polemonium. It is endemic to the state of Washington in the United States, where it occurs in the Columbia Basin, including the Channeled Scablands and the Palouse.[1] This perennial herb grows from a taproot, producing a cluster of stems up to 80 centimeters tall. The alternately arranged leaves are each made up of several linear-shaped leaflets up to 5 centimeters long. The hairy, glandular inflorescence is an open array of white or lavender flowers with five corolla lobes.[1][2] Flowering occurs in May through July.[1] This species occurs in riparian habitat and seasonally moist depressions and bottomlands.[1][2] Other species in the habitat may include Crataegus douglasii, Amelanchier alnifolia, Elymus cinereus, Rosa woodsii, and Ribes aureum.[3] There are about 26 occurrences of this species, divided into 6 or 7 populations. The plant's total distribution covers less than 2500 acres.[1] Threats to the species include overgrazing, though it can tolerate some grazing activity, being adapted to disturbance. Land use conversion is a threat, for example, the conversion of the Palouse grasslands to agriculture. Other threats include alterations in hydrology, herbicides, and introduced species.[1] References1. ^1 2 3 4 5 Polemonium pectinatum. The Nature Conservancy. 2. ^1 Polemonium pectinatum. Washington Burke Museum. 3. ^[https://web.archive.org/web/20101029055506/http://centerforplantconservation.org/Collection/CPC_ViewProfile.asp?CPCNum=3559 Polemonium pectinatum.] Center for Plant Conservation. External links{{Taxonbar|from=Q7209293}} 3 : Polemonium|Flora of Washington (state)|Flora of North America |
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