2. Gonolobus suberosus (Linnaeus) R. Brown in W. Aiton and W. T. Aiton, Hortus Kew. 2: 82. 1811.
[E F]
Angle-pod
Cynanchum suberosum Linnaeus, Sp. Pl. 1: 212. 1753; Matelea suberosa (Linnaeus) Shinners; Vincetoxicum suberosum (Linnaeus) Britton
Stems sparsely to moderately pubescent, pubescence of internodes ubiquitous, trichomes eglandular and glandular-capitate. Leaves: petiole 2.8–5 cm, pubescent; blade deltate to ovate-elliptic, oblong, or suborbiculate, 2.9–24.5 × 2.5–17.5 cm, base cordate, apex acuminate, abaxial surface pubescent, hairs eglandular and glandular, adaxial surface pubescent, hairs eglandular, colleters 2–4, ca. 0.3 mm. Peduncles to 17 mm, pubescent. Pedicels 0.7–3.7 cm, pubescent. Flowers: calyx lobes lanceolate, 1.6–5.4 × 0.2–1 mm, margins entire, apex obtuse, abaxial surface pubescent to glabrate, adaxial surface glabrous; corolla uniformly green, olive-green, yellow-green, or neon green or multicolored and generally dark maroon to brownish near base and green to yellow-green near tips, subcampanulate at base, tube 1–1.4 × 1–1.5 mm, lobes ovate to elongate-deltate, 2.6–11 × 2–4 mm, slightly lobed at base, glandular swelling frequently present in sinus, apex obtuse, abaxial surface glabrous, adaxial surface glabrous or pubescent only along right sides; corolline corona reduced to small mounds opposite anthers, glabrous; gynostegial corona prostrate-undulating; style-head 2.6–3.7 mm diam., stipe ca. 0.5 mm; dorsal anther appendages 0.9 × 0.9 mm, apex rounded to truncate, or 2-lobed to emarginate; pollinia ovate, 0.6 × 0.2 mm. Follicles ovoid, 8–15 × 1.5–2.8 cm, surface glabrous or minutely pubescent. Seeds 6–10 × 3–7 mm, distal margin dentate, surfaces somewhat muricate, glabrous, coma white, to 4.5 cm.
Varieties 2 (2 in the flora): c, e United States.
