On the Rare Plant Technical Council List
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...
Perennial, to 8.5 dm tall from slender ovoid bulbs; basal leaves linear, to 35 cm long; stem leaves fewer and smaller; flowering stem, one per bulb; inflorescence sparsely branched or a single raceme with small leaf-like bracts below each flower that...
Robust perennial herb to 1 m tall, forming large clumps; leaves mostly in 1-3 pairs in the basal 1/4 of the plant, petioles 5-10 cm long, blades broadly ovate to more or less circular, thick, leathery-succulent, glaucous bluish-green, sparsely tuberc...
Perennial herb; stems 2-5 dm long, glabrous except for the glandular-pubescent upper parts, openly branched; basal leaves biternately to triternately divided into 3 or 6 leaflets, leaflets lobed, glabrous, dark green above, somewhat paler beneath; pe...
Robust, herbaceous perennial, with 3-12 branching stems, 0.5-1.5 m tall; leaves blue-green, 10-15 cm long, divided, the sinuses broad and square, margins, midribs, and veins armored with stout yellow spines; stem and leaf latex white; flowers large a...
Herbaceous perennial; stems from a subterranean woody root crown, 4-8 cm tall, prostrate to ascending; leaves 2-4 cm long, oblong-lanceolate, white tomentulose on leaf margins; inflorescence a terminal umbel with 4-15 flowers; corolla browish purple;...
Perennial; plants low, tufted, stemless or with short stem (0-4(6) cm long), stems prostrate; herbage usually silvery; foliage densely strigose with rather coarse straight and parallel, appressed, dolabriform hairs; stipules not connate; leaves 2-6.5...
Perennial; stems several, reddish, ascending, up to 1.2 m long, the tallest plants often supported by adjacent vegetation; leaves to 12 cm long, pinnately compound, with 15-25 ovate leaflets, sparsely pubescent with fine, straight, appressed hairs; f...
Rhizomatous perennial; foliage strigose; stems 2-4 dm, clustered, ascending or decumbent; leaves 4-10 cm; leaflets 13-25, obovate to narrowly oblong, 5-15 mm long, 2-6 times longer than wide, flat or folded, often glabrate above; lower stipules conna...
Matted perennial herb; stems spreading on ground (humistrate), freely branching, densely leafy, to 4 dm long; herbage densely hairy with soft, fine, basifixed hairs; stipules connate; leaves silvery-gray, 1.5-4 cm long; leaflets 9-15, obovate or oblo...