stems tufted, erect or decumbent, 3/4–1 (or under cultivation up to 3) in. long, 4–7 lin. thick, obtusely 4-angled, with the teeth along the angles tubercle-like, apiculate, sometimes rather obscure, dull green or greyish-green, subglaucous; flowers 1–4 (often 2) together, between the angles, near or at the apex or sometimes near the middle of the stem, erect; pedicels 2–6 lin. long, glabrous; sepals 3/4–1 1/2 lin. long, ovate or lanceolate, acuminate, glabrous; corolla rotate, 7–9 lin. in diam., glabrous and dull greenish or greenish-brown outside, shortly pubescent all over the inner face, not ciliate, whitish, marked all over with small round dark purple-brown spots; disk flattish; lobes 2 1/2–3 1/2 lin. long, 2 lin. broad at the base, ovate-lanceolate, acute or acuminate, slightly convex from the margins being slightly recurved; corona-lobes closely incumbent on the backs of the anthers and not prolonged beyond them, 3/4–1 lin. long, linear or linear-lanceolate, acute, obtuse or subdenticulate at the apex, dorsally expanded at the base into a truncate minutely tuberculate or more or less bifid crest, with or without a small warted tubercle between the teeth at the top, entirely yellow or dotted with purple-brown; odour somewhat sour, only perceptible close to the flower. null
