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

35. Atriplex serenana A. Nelson ex Abrams, Fl. Los Angeles. 128. 1904.

Stinking orach, bracteate orach

Herbs, annual, erect or sprawling, usually branched often forming tangled mats to 10 × (3-)5-20 dm, ascending branches sparsely scurfy. Leaves many, subsessile or very short petiolate; blade subconcolorous, lanceolate to oblong, elliptic, or oval, (8-)10-30(-40) × 3-12(-15) mm, margin sharply dentate to entire. Staminate flowers in glomerules in terminal spikes or panicles 3-20 cm, or reduced to solitary, rounded, terminal glomerule. Pistillate flower in small clusters, axillary. Fruiting bracteoles sessile or subsessile (stipe to 1 mm), cuneate-orbicular to obovate, somewhat compressed, 2.1-3.5 × (1.7-)2-3.7 mm, united 1/2 of length, margin sharply and often slenderly toothed beyond middle, faces often rather strongly veined, smooth or with 1 or more slender or flattened appendages. Seeds brown, 1-1.3(-1.5) mm. 2n = 18.

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

1 Staminate inflorescence an elongate panicle or spike bearing numerous, beadlike glomerules; fruiting bracteoles ± 1-veined; mainly of central valley and Owens Valley, to w Nevada, also coastal and insu- lar, s California   35a var. serenana
+ Staminate inflorescence of solitary, terminal, subglobose glomerule; fruiting bracteoles 3-veined; coastal s California...   35b var. davidsonii


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