23. Paronychia sessiliflora Nuttall, Gen. N. Amer. Pl. 1: 160. 1818.
Plants perennial, densely cespi-tose and mat-forming; caudex branched, woody. Stems erect to ascending, branched proximally, 5-25 cm, hirtellous. Leaves: stipules lanceolate to subulate, 2-3 mm, apex long-acuminate, often deeply cleft; blade linear-subulate, 4-7.5 × 0.5-0.8 mm, leathery, apex acute or shortly cuspidate-mucronate, very finely puberulent to glabrous. Cymes terminal, 3-6-flowered, congested, or flowers solitary. Flowers 5-merous, ± ovoid, with enlarged hypanthium and calyx narrowing distally, 3.6-5 mm, moderately pubescent with silky to stiff, antrorse to somewhat spreading hairs; sepals green to red-brown, midrib and lateral pair of veins prominent, lanceolate-oblong, 1.5-2 mm, leathery, margins whitish to translucent, 0.1-0.2 mm wide, scarious, apex terminated by awn, hood ± obscure, narrowly rounded, awn erect to somewhat spreading, 1-1.5(-2) mm, narrowly conic in proximal 2 with white, scabrous spine; staminodes filiform, 0.7-1 mm; style 1, cleft in distal 1/ 5, 1.4-1.5 mm. Utricles ovoid-oblong, 1.3-1.4 mm, densely pubescent in distal 1/ 2.
Flowering summer. Dry, stony hillsides, summits, and sandstone mesas; 700-3100 m; Alta., Sask.; Colo., Mont., Nebr., Nev., N.Mex., N.Dak., Okla., Tex., Utah, Wyo.