Artemisia sulcata

Artemisia sulcata Rydberg, sp. nov
A perennial, with a rootstock; stem 5 dm. high or more, glabrous or nearly so, strongly grooved, yellowish-green; leaves 5-10 cm. long, green and glabrate above, white-tomentose beneath, the lower pinnately divided into narrowly lance-linear lobes, the upper entire and lance-linear; inflorescence paniculate; branches elongate and raceme-like; involucre broadly campanulate, 3 mm. high and fully as broad, slightly tomentose when young, soon glabrate, shining and yellowish; bracts about 10, in 3 series, broadly oval, obtuse; ray-flowers 6 or 7; corollas 1 mm. long; disk-flowers 12-15; corollas yellow, 2 mm. long, funnelform; achenes 1 mm. long.
Tvpe collected at Casjis Grandes, Chihuahua, August 30, 1899, Townsend &■ Barber 437 (herb. N. Y. Bot. Gard.).
Distribution: New Mexico to San Luis Potosi, Durango, and Arizona.