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

31d. Atriplex parishii S. Watson var. subtilis (Stutz & G. L. Chu) S. L. Welsh, Rhodora. 102: 423. 2001.

Subtle orach

Atriplex subtilis Stutz & G. L. Chu, Madroño 44: 184, figs. 1, 2a. 1997

Stems erect, much branched, 1-3 dm, densely scurfy; branches opposite, often purple-reddish, neither ribbed nor striate; internodes 5-15 mm. Leaves mostly opposite, sessile; blade ovate-triangular to broadly ovate, 2-4 × 1-3 mm, mostly cordate-clasping, densely scurfy on both sides. Flowers of both sexes intermixed in axillary glomerules, but sometimes staminate clustered toward apex. Fruiting bracteoles persistent, deltoid, 2.4-2.8 mm and wide, margin with 1-3 pairs of irregular teeth, proximalmost usually larger and retrorse, apex shortly acuminate, with 2 longitudinal rows of tubercles on 1 or both surfaces. Seeds dark brown.

Flowering late spring-fall. Saline depressions, often within or later growing in depressions of vernal pools; of conservation concern; 40-100 m; Calif.

Atriplex depressa var. subtilis occurs with Allenrolfea occidentalis, Distichlis spicata, Centromadia pungens, Suaeda Moquin-Tandonii, Spergularia macrotheca, Frankenia salina, and Sporobolus airoides and other Atriplex spp. Stutz and Chu compared this variety with Atriplex depressa, with whose more northern range in the Central Valley it is contiguous. The leaves are relatively small and the stems are thin. Plants of var. subtilis appear very much like an elongated, gracile form of var. parishii.


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