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.

Froelichia arizonica là loài thực vật có hoa thuộc họ Dền. Loài này được Thornber ex Standl. mô tả khoa học đầu tiên năm 1917.