Zyrphelis nervosa Zinnecker

Plant up to 8 ft high, sparsely branched, young branches subherbaceous, becoming woody. Branches stiffly erect, glabrous, leafy to the summit. Leaves 2.5-7.5 cm long, up to about 0.75 cm broad at the base, linear-subulate, acute, flat, 1-3 nerved, ciliate-serrate, decurrent. Peduncles 6-12 from the axils of the uppermost leaves, 1-headed, 3-8 cm long, with several to many leafy bracts decreasing in size and more widely spaced upwards, roughly hairy and glandular. Inflorescence corymbose. Capitula radiate, 3 cm in diameter including the rays, 1 cm diameter excluding them. Involucral bracts fairly rigid, 1-3-seriate, but nearly all equal in length, up to 8 mm long, oblong-linear, roughly pubescent and glandular, with a few long hairs near the apex, and often black-tipped, slightly keeled on back. Ray-florets white, about twenty-four in a capitulum, 1.4-1.6 cm long, with a slender basal tube 2-3 mm long and with the ligulate portion 1.2-1.3 cm long and about 3 mm broad, minutely 3-toothed at the apex; tube with a few short yellowish hairs around the top; immature achenes flattened, 3.5 mm long, elliptic-oblong in outline, minutely glandular-papillose on the sides, and with a thickened glabrous margin, with a pappus of a single closely set row of barbellate caducous bristles about the length of the corolla-tube; nearly mature achene 5 mm long, 3 mm broad. Style slightly exserted. Disc-florets about 4 mm long, with the tube slender in the basal 1 mm and expanded above; achene aborted, glabrous with a pappus of a few barbellate caducous bristles.