Lasthenia Glaberrima DC

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Lasthenia glaberrima DC. smooth goldfields Asteraceae - aster family status: State Endangered, BLM sensitive, USFS sensitive rank: G5 / S1 General Description: Hairless or nearly hairless annual herb with lax stems, commonly rooting from lower nodes, 5-35 cm tall. Leaves opposite, linear, entire, 2-8 cm long; some pairs fused at the base and sheathing the stem. Floral Characteristics: Flowering heads radiate, few, often on long peduncles. Involucre 5-7 mm high; bracts united into a bell-shaped cup with short, ciliate teeth. Rays yellow, very short and inconspicuous, not projected beyond the involucre. Flowers June to July. Fruits: Elongate achenes; pappus of 5-10 firm, jagged, and sometimes shortly awn-tipped scales. Illustration by John H. Rumely, Identification Tips: Lasthenia maritima* is related, but ©1955 University of Washington confined to coastal areas. L. glaberrima has connate involucral Press bracts, while the bracts of L. maritima are distinct nearly or completely to the base. Range: Mostly west of the Cascades, from southern WA to central CA. One population has been identified in B.C. Habitat/Ecology: Margins of vernal pools, wet or muddy stream banks, wetlands, and winter-flooded meadows. The extant WA population grows around vernal ponds on basalt tablelands; the area is wet in winter and dries by late spring. Associated species include rabbitfoot grass (Polypogon monspeliensis), Nuttall's quillwort (Isoetes nuttallii), calicoflower (Downingia yina), fringed waterplantain (Damasonium californicum), willow (Salix exigua), smooth © Carol W. Witham spike-primrose (Epilobium pygmaeum), pale spike-rush (Eleocharis macrostachya), and inch-high rush (Juncus uncialis). Comments: There is 1 historical occurrence and 1 recent occurrence in WA. The extant population is currently threatened by competition from nonnative plants. References: Flora of North America 1993+, vol. 21. © Carol W. Witham Adapted from Field Guide to the Rare Plants of Washington http://www.washington.edu/uwpress/search/books/CAMFIE.html.

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