S1
Critically Imperiled
Cirsium vinaceum (Sacramento Mountains Thistle)
Stout rhizomatous biennial with a robust basal rosette; stem 1.0-1.8 m tall, with many ascending, brown-purple branches; basal leaves green, glabrous, 3-5 dm long, up to 2 dm wide, ragged-edged, divided nearly to the midrib, the divisions tipped with...
Cuscuta warneri (Warner's Dodder)
Twining, tangled, yellow threadlike annual with stems 0.5 mm or less in diameter; inflorescence a glomerule of subsessile flowers on glabrous pedicels; flowers 5-merous, 2.1-4 mm long, slightly fleshy; calyx campanulate-cupulate, about 1/2 the coroll...
Cylindropuntia viridiflora (Santa Fe Cholla)
Plants shrubby, much-branched to about 0.8 m in height and about 2 meters across; main stems with lateral "joints" primarily in whorls at ends of each year's growth, some of these elongating into secondary main stems; stems 1.5-2 cm thick; lateral jo...
Dermatophyllum guadalupense (Guadalupe Mescalbean)
Evergreen shrub, about 1 m tall; leaves pinnately compound with 7-13 oval, leathery, satiny pubescent leaflets; flowers pea-like, purple (rarely white), about 25 mm long; pods 5-14 cm long, 10-14 mm wide, slightly constricted between the seeds; seeds...