Artemisia ludoviciana subsp. albula (Woot.) Keck

Artemisia albula Wooton, Contr. U. S. Nat. Herb. 16: 193
1913.
Artemisia microcephala Wooton, Bull. Torrey Club 25: 455. 1898. Not A. microcephala Hildebr. 1888.
A perennial, with a cespitose rootstock; stem 3-7 dm. high, branching, white-floccose; leaves white-tomentose on both sides, 1-5 cm. long, sessile; lower leaves ovate or obovate in outline, usually with 3-5 lanceolate lobes, the upper ones linear to oblong-lanceolate, entire or toothed, acute at both ends; heads many in few-headed leafy racemes either paniculate or simple at the ends of the branches; involucre densely tomentose, campanulate, about 3 mm. high and 2 mm. broad; bracts about 10, in 3 series, the outer ones ovate, half as long as the innermost; inner bracts oval, obtuse; ray-flowers about 8; corollas 2-toothed, nearly 1.5 mm. long; disk-flowers 10-12; corollas 2 mm. long; achenes 1 mm. long.
Type locality: Organ Mountains, New Mexico.
Distribution: Texas to Colorado, southern California, Sonora, and Chihuahua.