Froelichia arizonica Thornb. ex Standl.

Plants perennial; taproot en-larged, woody. Stems 1-several, ascending or decumbent, often branched distally, 3-10 dm, sericeous-tomentose with white hairs. Leaves usually crowded at base, few on stems, sessile or short-petiolate; blade lanceolate, proximal leaves 3-12 × 0.5-2.5 cm, base attenuate, apex acute or rarely obtuse, scaberulous or canescent adaxially, sericeous-tomentose with bright whitish hairs abaxially. Spikes dense, stout, flowers arranged in 3-ranked spiral; bracteoles dark, glabrous. Flowers (3.5-)4-5.5 mm; perianth lobes narrowly oblong, apex obtuse, or acutish, pubescence dense, bright white; filament lobes stramineous or darkened, blunt. Utricles narrowly or broadly winged laterally, 2.5-5.5 × 3-4.5 mm, longer than broad, wing margins irregularly dentate, 1 or both surfaces of perianth with 1 or more basal tubercles or spines.

Ariz., N.Mex., Tex.; Mexico (Chihuahua, Coahuila, Nuevo León).

Flowering year-round.

Open rocky or gravelly hillsides; 700-2200m.

Froelichia arizonica Thornber, sp. nov
Froelichia campestris Small, Fl. SB. U. S. 397, in part. 1903.
Stout, erect or ascending perennial, from a thick woody root; stems usually several or numerous, simple or branched, 3-10 dm. high, sericeous-tomentose with usually white hairs; leaves usually crowded at the base, few on the stems, short-p etiolate, the blades elliptic, obovateoblong, oblong, or oval, the upper often narrowly oblong, 2-9 cm. long, 0.6-2.7 cm. wide, obtuse or acute at the apex, attenuate at the base, scaberulous or canescent on the upper surface, sericeous-tomentose beneath with white or grayish hairs; spikes stout, dense, 4 cm. long; bracts broadly ovate, acute or acuminate, usually fuscous; bractlets fuscous, rarely stramineous; calyx-lobes narrowly oblong, obtuse or acutish; calyxtube narrowly winged, the wings dentate, often interrupted or very short, one or both sides of the tube with short thick crests, or merely tuberculate; seed 1.5 mm. long, brown.
Type collected in Stone Cabin Canyon, Santa Rita Mountains, Arizona, in 1902, David Griffiths&J. J. Thornber 73 (U. S. Nat. Herb. no. 497162).
Distribution: Dry stony plains and hillsides, western Texas to southern Arizona, south toCoahuila and Nuevo Le6n.