Flora of North America species comparison

15–35(–70) cm.

erect, branching, filiform, twining branches absent, glandular-hairy, viscid.

petiole 4–15 mm;

blade ovate to broadly ovate, 30–40 × 20–25 mm, smaller distally.

cauline, opposite proximally, alternate distally;

petiole present;

blade not fleshy, not leathery, margins entire.

axillary, flowers solitary;

bracts present, alternate.

1–3 mm, longer in fruit, glandular-hairy.

present, not twining, recurved in fruit;

bracteoles absent.

calyx lobes equal, 4–5 mm in flower, 6.5–9 mm in fruit, glandular-hairy;

corolla 8–10 mm, abaxial lip cream, often with darker veins, palate white with yellow spots, furrowed, adaxial lip cream with deep purple veins;

staminode 0–1 mm.

bisexual;

sepals 5, basally connate, calyx slightly bilaterally symmetric, cupulate, lobes linear to narrowly oblanceolate;

corolla purple with darker veins, bilaterally symmetric, bilabiate and personate, tubular, tube base gibbous abaxially, not spurred, lobes 5, abaxial 2, adaxial 3;

stamens 4, basally adnate to corolla, didynamous, filaments glabrous or sparsely hairy, pollen sacs 1 per filament;

staminode 0 or 1, capitate;

ovary 2-locular, placentation axile;

stigma subcapitate.

capsules, locules equal, dehiscence poricidal.

pendent, globular, 5–8 mm, sparsely glandular-hairy.

1.5–2.5 mm, ridged and tuberculate dorsally, winged adaxially.

30–70, black or dark brown, ellipsoid, wings present, cupulate.

= 13.

= 26.