Iresine arenaria Standl.

Iresine arenaria Standley, Contr. U. S. Nat. Herb. 18: 93
1916.
Erect perennial, suffrutescent at the base, much branched, the branches slender, erectascending, green, striate, glabrous; petioles slender, 4-5 mm. long; leaf-blades linear to narrowly ovate, 2.5-4.5 cm. long, 2-12 mm, wide, acute or acuminate at the apex, obtuse to acuminate at the base, rather thick, deep-green, glabrous; flowers polygamous, narrowly paniculate, the panicles open or congested, nearly naked, 4-20 cm. long, the branches slender or stout, ascending, short, the spikelets few, short or elongate, pedunculate or sessile, the rachis densely lanate ; bracts and bractlets roundedovate, obtuse or acutish, short-cuspidate, hyaline, whitishstramineous, densely shortvillous ; sepals oblong-oval, 1.5 mm. long, rounded at the apex, 3-nerved, densely pilose with soft white hairs; filaments subulate-linear, shorter than the sepals, the staminodia one third as long as the filaments, narrowly triangular, entire; style short, the stigmas slender; utricle orbicular, compressed ; seed orbicular, 1 mm. broad, dark reddish-brown, shining.
Typ3 locality: Topolobampo, Sinaloa.
Distribution: On sandy hillsides, vicinity of the type locality.