S1
Critically Imperiled
Acarospora clauzadeana (A Lichen)
A gypsophilic, crustose disk lichen appearing as small (<1 to 2mm) raised, citrine-yellow disks on gypsum surfaces. Thallus (vegetative body of the lichen) is very sparsely developed and can be endolithic (growing within the rock crystals), ...
Agalinis calycina (Leoncita False Foxglove)
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-...
Aliciella cliffordii (Clifford's Gilia)
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...
Amsonia tharpii (Tharp's Blue Star)
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...
Anticlea mogollonensis (Mogollon Death Camas)
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...
Anulocaulis leiosolenus var. howardii (Howard's Gyp Rinstem)
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...