A straggling, strongly aromatic perenÂnial herb, stems up to 2m long when supported by other vegetation, simple below, branching above, branches long, terminating in corymbose panicles, gland-dotted, commonly greyish-white woolly, sometimes glabrous, leafy. Leaves up to 120 x 15 mm, decreasing in size upwards and passing into distant inflorescence bracts, lanceolate or linear-lanceolate, apex very acute to acuminate, base narrowed, decurÂrent on stem in long narrow wings, margins revolute, gland-dotted below, both surfaces glabrous or, more commonly, scabrous above and lightly cobwebby at least initially, white-felted below. Heads heterogamous, c. 3x1 mm, very many in congested cymose clusters corymbose-paniculately arranged. Involucral bracts in 2—3 series, loosely imbricate, about equalling tlowers, not radiating, translucent, inner tipped bright canary-yellow. Receptacle with fimbrils at least equalling ovaries. Flowers 4—6, 3—5 ("female"), 1-2 ("bisexual"), yellow. Achenes 0,75 mm, glabrous. Pappus bristles many, delicate, bases cohering by patent cilia. Fig. 11:2.
