- Thelypodium howellii
Taxobox
name = Howell's Thelypody
status = G2
status_system = TNC
regnum =Plant ae
divisio =Magnoliophyta
classis =Magnoliopsida
ordo =Brassicales
familia =Brassicaceae
genus = "Thelypodium "
species = "Th. howellii"
binomial = "Thelypodium howellii"
binomial_authority = S. Wats.Howell's thelypody ("Thelypodium howellii"), is a rare plant of the Western U.S. It is endemic to a relatively small area on the borders of three western States:Oregon ,Nevada , andCalifornia .Technical Description
Plant biennial, more or less hispid-pubescent or sparsely to rather heavily hirsute near the base, otherwise glabrous, somewhat glaucous. Stems slender, erect, usually branched at the base, sometimes sparingly branched above, 30–70 cm tall. Leaves primarily basal in a rosette. "Basal leaves" several, more or less rosulate, not or sparsely haired, oblanceolate, obtuse, lyrately lobed to occasionally entire, 2–4 (10) cm long; petiole short. "Cauline leaves" rather numerous, glabrous, glaucous, entire, narrowly oblong to linear–lanceolate, acute, erect and usually appressed, sagittate at the base and often somewhat clasping, sessile, 1½–3 (10) cm. Racemes elongate, lax, racemose, not at all corymbose.Flower s relatively distant; pedicels stout, ascending, 2–5 mm; sepals oblong, nearly erect, usually purplish or greenish-white, lateral, somewhat saccate at the base, scarious–margined, 4–9 (usu. 7) mm; petals pale blue, lavender, or purple, narrowly spatulate (spoon-shaped), crispate at base, twice as long as the sepals (8–20 mm); stamens slightly longer than the sepals, with paired filaments partly to completely fused, about equaling the sepals, and 2–2½ mm anthers; style ½–1½ mm; style long; stigma small, entire, not lobed; septum uniformly coloured. Pods cylindric siliques, somewhat curved inward, ascending to erect, somewhat torulose, 1½–4½ cm long, about 1 mm broad; stipe a little less than ½ mm.Seed s thick, plump, brown.cite web
title =Howell's Thelypodium
work = Eagle Lake Field Office
publisher =U.S. Department of Interior, Bureau of Land Management
url =http://www.blm.gov/ca/pa/ssp/plants/thelypodium_howellii.html
accessdate =2007-05-01] cite journal
author = Payson, Edwin Blake
year = 1922
title = Study of "Thelypodium" and its Immediate Allies
journal = Annals of the Missouri Botanic Garden
volume = 9
issue = 3
pages = 265–266] cite book
last = Schofield
first = W.B.
year = 2002
title = Field Guide to the Liverwort Genera of Pacific North America
Publisher = University of Washington Press
pages = 181] cite book
last = Rollins
first = Reed C.
year = 1993
title = The Jepson Manual: Higher Plants of California
editor = Hickman, James C.
publisher = University of California Press
pages = 444-446] cite book | last = Hitchcock | first = C. Leo | coauthors = Arthur Cronquist, Marion Ownbey, & J. W. Thompson | year = 1964 | title = Vascular Plants of the Pacific Northwest, Part 2: Salicaceae to Saxifragaceae| pages = 549 | publisher = University of Washington Press]Distribution, Habitat, and Ecology
This plant is endemic to a small area stretching from north-eastern
Oregon to north-easternCalifornia . It lives inalkaline oradobe meadow s and seeps, river valleys and moist plains inGreat Basin sagebrush scrub. The fire ecology of this plant is not known at present.Conservation Status and Threats
U.S. Forest Service Pacific Southwest Region Sensitive Species.
California Native Plant Society List 1B.2.NatureServe California State Rank: S2.2; Global Rank: G2The threats facing Howell's thelypody are not known at present.
Field Identification
Howell's thelypody flowers from May to July. Var. "spectabilis", known only from Malheur Co., Oregon, is larger than var. "howellii", has larger, more strongly purple flowers, and is a federally listed species.
References
External links
* [http://www.natureserve.org/explorer/index.htm NatureServe Web Page]
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