Flora of North America species comparison

40–220 cm, self-supporting, glabrous;

branches not twining.

6–200 cm, not self-supporting, glandular-hairy;

branches twining.

alternate;

blade linear, 50–120 × 3–10 mm, surfaces glabrous.

opposite proximally, alternate distally;

blade ovate, 2–60 × 1–50 mm, surfaces glandular-hairy.

terminal, racemes.

axillary, flowers solitary.

2–6 mm.

2–20(–25) mm.

chasmogamous;

calyx lobes equal, glabrous, adaxial lobe 6–8 × 1.5–2.5 mm;

corolla pink to pale pink, 13–18 mm, base gibbous, mouth 3–5 mm diam., palate not veined, rounded, 5–7.5 mm diam., puberulent.

cleistogamous and chasmogamous;

calyx lobes equal, glandular-hairy, adaxial lobe 3–6 × 1–3.5 mm;

corolla pale purple to purple, sometimes dark-veined, 7–12 mm, base slightly gibbous, mouth 2.5–3.5 mm diam., palate white, purple-veined, rounded, 2.5–6 mm diam., puberulent.

globular-ovoid, 7–9 mm, glabrous, abaxial locule with 2 pores.

ovoid, 3–11 mm, glandular-hairy, abaxial locule with 1 pore.

black, 1–1.5 mm, ridges reticulate.

brown, 0.5–1 mm, ridged longitudinally.

= 32.

= 32.