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FNA | Family List | FNA Vol. 4 | Chenopodiaceae | Atriplex

49. Atriplex acanthocarpa (Torrey) S. Watson, Proc. Amer. Acad. Arts. 9: 117. 1874.


Obione acanthocarpa Torrey in W. H. Emory, Rep. U.S. Mex. Bound. 2(1): 183. 1859

Shrubs or subshrubs, dioecious, evergreen, mainly 2-10 × 4-10+ dm, woody especially basally, unarmed; branchlets obtusely angled to subterete. Leaves persistent, proximal ones opposite, becoming alternate distally, short petiolate or subsessile; blade oblong to oblong-lanceolate, ovate, obovate, or spatulate, 12-40(-50) × 5-25 mm, base commonly subhastate to cuneate, margin entire or sinuate-dentate to strongly undulate-crisped, apex acute. Staminate flowers in interrupted or crowded glomerules 2-4.5 mm thick, in sparsely leafy paniculate spikes to 5+ dm. Pistillate flowers few to solitary, in axillary clusters or in crowded or interrupted, often leafy, erect, branched spicate racemes or racemose panicles to 25+ cm. Fruiting bracteoles on slender or stout stipes (2-)4-20 mm (or sessile), body broadly elliptic to globose, 6-15 mm and wide, spongy, united to the linear apex, margin deeply laciniate, faces appendaged with flattened to hornlike tubercles to 8 mm. Seeds brown, 1.5-2 mm.

Varieties 2 (2 in the flora): sw United States, n Mexico.

1 Leaf blade ovate to rhombic-ovate, elliptic, or spatulate, margin mainly sinuate-dentate; mature fruiting inflorescences ascending to erect; west Texas, s New Mexico, se Arizona.....   49a var. acanthocarpa<
+ Leaf blade, at least some, hastate-lanceolate, or strongly undulate-crisped; mature fruiting inflorescences mainly horizontally spreading; s Texas, Mexico   49b var. coahuilensis<


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