Perennial, geophytic herb, 50-120(-230) mm. Stems several-branched and ascending. Leaves verticillate, irregularly spaced to opposite, basal half linear, apical half becoming elliptic; blade 10-30 x 0.5-9.0 mm, upper surface pilose or glabrous, lower surface glabrous, midrib pilose. Inflorescence 3-7-flowered, pedunculate. Flowers: pedicels 4-9 mm long; corolla lobes 2-4 x 1-2 mm, spreading at anthesis, dorsal surface glabrous to moderately pilose, ventral surface glabrous or pubescent, green; corona white, apical process short and broadly triangular to long and slender, ventral appendage erect to slightly inflexed. Pollinia pyriform, germination zone inconspicuous; corpusculum 0.1-0.3 mm long. Flowering time Aug.-Apr., June. Fruit 45-60 mm long, with scattered bristles 0.5-2.5 mm long.
Single-stemmed or branched perennial to 20 cm; sap milky. Leaves linear to elliptic, whorled, at least above. Flowers > 10 mm diam., green with white corona usually much longer than style apex.