On the Rare Plant Technical Council List
Perennial herb with numerous branched and tangled rhizomes from a central caudex; above-ground stems solitary or in clumps, arising from upturned rhizome tips, forming short, leafy tufts 1-4 cm tall; leaves opposite and sessile, spreading to ascendin...
Biennial or short-lived perennial, usually densely pubescent, the hairs sessile or short-stipitate, simple or forked, 5- to 9-rayed, smooth or finely granular; stems several, erect or the outer ones decumbent or procumbent, simple or sometimes much b...
Annual or biennial, densely pubescent; trichomes sessile or short-stipitate, smooth or fine granular, rays long and slender, simple or infrequently forked near base, not appressed, some rays erect; stems several, stout and erect or the outer ones dec...
Perennial, densely pubescent and rough-granular to the touch; trichomes on short stalks, rays several, distinct, usually bifurcate; stems spreading or erect, simple, about 10 cm long; basal leaves entire, 3-4 cm long, blades elliptical to obovate, na...
Perennial herb forming low, cushion-shaped clumps from an intricately branching, subterranean caudex; herbage silvery-gray, covered with a crust of flattened, stellate hairs; hairs usually with 5 main rays, each twice bifurcate into 20 tips, rays som...
Long-lived, low growing perennial with diffusely branching root crown (caudex) forming mounded clumps 1-3 dm in diameter; herbage densely covered with overlapping gear-shaped (stellate-discoid) trichomes; stems 3-10 cm long; basal leaves narrowly obl...
Perennial, more or less densely pubescent with closely appressed more or less stellate trichomes, these 0.2-0.3 mm in diameter, sessile or substipitate, smooth or finely granular, rays 4-7, distinct but stout and usually contiguous at their bases and...
Perennial herb to 8 cm tall; stems and rootstocks numerous, short, and almost matted, appearing caespitose; leaves digitately 5-foliate; leaflets divided terminally into three lobes; leaflet bases narrowly cuneate; midvein of leaflets raised on lower...
Annual herbs, stems 2-15 cm tall, succulent, branches ascending, yellow-white or reddish-purple, glabrous or sparsely farinose; leaves entire, alternate, fleshy, ovate to suborbicular, 5-15 mm long; flowers monoecious; bracts of female flowers triang...
Perennial herb; stems 15-40 cm tall, branching above, faintly scabrous-hairy; leaves oblong to somewhat oblong-oval in outline, blade 1.5-14 cm long, 1-9 cm wide, 2- to 3-times pinnately parted, the ultimate divisions linear, acute-mucronate at tips,...