Shrubby, robust, erect, branched; leaves broadly linear-subulate or lanceolate-subulate, acute, flat, 3-nerved, ciliato-serrate; pedunc. numerous, corymbose at the ends of the branches, scabrous, pluribracteate; involucral scales 3-seriate, lanceolate, acute, glabrous, ciliate, 3-ribbed; achenes of ray densely cano-pubescent, 2 feet high or more; the most robust and woody of the genus. Leaves 1-1 1/2 inch long, 1-3 lines wide at base, the young ones erect, the old deflexed, all rather rigid, with immersed glands. The branches are leafy to the summit, and from the axils of the uppermost leaves spring many short (2-3 inch long) peduncles, each bearing several depauperated, scattered leaves or bracts. Invol. scales each with 3 glandular rib-striae. Achenes of the ray with copious, plumose pappus.
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Very like G. corymbosum but involucral bracts glabrous with ciliate margins and pappus bristles conspicuously plumose not barbellate.
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