Critically Imperiled
Annual, hemiparasitic, somewhat succulent, glabrous (except floral parts), to about 50 cm tall, with numerous divergent, ascending branches, green or purplish, drying blackish; leaves mostly opposite (especially below), linear, entire, stem leaves 2-...
Taprooted, glandular pubescent, short-lived perennial with a well-developed basal rosette of leaves; stems 10-90 cm tall, freely and divaricately branching; basal leaves entire, to coarsely toothed, to once-pinnatifid, 1.2-5 cm long, 1-4.5 mm wide; l...
Herbaceous perennial from a woody caudex; stems sparsely pubescent, 30-50 cm long; leaves glabrous, the lower elliptic to lanceolate, 6-10 mm wide, the upper linear, 1 mm broad; calyx lobes awl-shaped, glabrous or sparsely ciliate, 5-6 mm long; corol...
Perennial suffrutescent herb; stems from a woody rootstock, up to 2 dm tall; leaves subsessile, crowded, up to 5 cm long and 12 mm wide, those on the lower half of the stem elliptic-lanceolate and those above linear to linear-lanceolate; flowers pale...
Low, subcaulescent perennial; basifixed pubescent; stems mostly 2-4 cm long, obscured by stipules and leaf bases; stipules 2-3 mm long, merely amplexicaul or the lowermost connate-sheathing; leaves 1-2.5 cm long; leaflets mostly 7-13, elliptic, obtus...
Perennial herb 2-5 dm high, with (1-)3-6(-10) basal rosettes usually elevated above the ground on a branched, woody caudex; flowering stems 1 per basal rosette, arising centrally and terminating the rosette, glabrous; basal leaves broadly oblanceolat...
Annual herb with 1 or few erect stems, 2-5 dm tall with long-villose, non-glandular hairs mixed with shorter gland-tipped hairs; leaves oblong to lanceolate, unlobed, 3-nerved, 2-4 cm long, with strongly wavy margins and bases clasping the stem; flor...
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...
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...