Flora of North America species comparison

erect to ascending, much-branched, 10–35 cm, scabrous, puberulent to pubescent, sometimes glabrous with age.

erect to ascending, much-branched throughout, 10–30 cm, glabrous.

stipules lanceolate, 5–15 mm, apex acuminate, entire;

blade linear, 7–25(–34) × 0.5–1 mm, leathery, apex obtuse to subacute or submucronate, pubescent to puberulent.

stipules lanceolate, 2–5 mm, apex acuminate to long-acuminate, entire;

blade linear, 7–15(–19) × 0.4–0.8(–1) mm, leathery, apex subobtuse or minutely cuspidate, glabrous.

5-merous, short-campanulate, with enlarged hypanthium and calyx widening somewhat distally, 1.8–2.8 mm, puberulent, glabrous to hirtellous distally;

sepals green to red-brown, veins absent, oblong, 1.3–1.8 mm, leathery to rigid, margins whitish to translucent, 0.05–0.1 mm wide, scarious, apex terminated by awn, broadly rounded, awn widely divergent, 0.4–0.8 mm, conic in proximal 1/2–2/3 with yellowish, scabrous spine;

staminodes filiform, 0.6–1 mm;

style 1, cleft in distal 1/3–1/6, 0.8–1.2 mm.

5-merous, ± short-campanulate, with enlarged hypanthium and calyx constricted proximally, 2.3–3.2 mm, hirtellous, glabrous distally;

sepals red-brown, veins absent to obscure, narrowly oblong, 1.8–2.3 mm, leathery to rigid, margins translucent, 0.05–0.1 mm wide, scarious, apex terminated by awn, hood conspicuously rounded, awn divergently spreading, 1–1.5(–2) mm, ± broadly conic in proximal 1/3 with yellowish, glabrous spine;

staminodes filiform, 0.7–0.9 mm;

style 1, cleft in distal 1/5, 0.6–1.3 mm.

terminal, 20–70-flowered, open, clusters 1–2 cm wide.

terminating branchlets, 10–40+-flowered, repeatedly forked and diffuse, clusters 1–3 cm wide.

ellipsoid-ovoid, 0.8–1 mm, smooth, glabrous.

ovoid, 1.2–1.5 mm, minutely papillose distally.