Flora of North America species comparison

procumbent, not twining, herbaceous, minutely and sparsely strigulose, hairs usually retrorse, rarely antrorse.

procumbent and trailing at least proximally, often weakly climbing-twining distally, hirsute to villous-hirsute, hairs spreading to slightly upcurved or slightly to strongly deflexed.

3, blades linear-oblong or narrowly oblong to narrowly lanceolate, narrowly elliptic-lanceolate, or linear-elliptic, 20–55 × 2–8(–11) mm, leathery, veins prominently raised on both surfaces, apex rounded to obtuse, surfaces glabrate to sparsely strigulose abaxially, sometimes glaucous, glabrous adaxially.

3, blades narrowly to broadly oblong to elliptic-oblong, elliptic, or ovate, (20–)25–50 × 10–30 mm, herbaceous, veins not raised, apex rounded to obtuse, surfaces loosely strigose to pilose or villous.

flowers solitary and axillary or 2–8(–10) in reduced pseudoracemes, usually on distal 1/4–1/2 of axis;

axis 30–150 mm.

flowers 6–10, usually on distal 1/4–1/2 of axis, often in fascicles;

axis (3–)5–15(–20) mm.

calyx 5–9 mm, strigulose, lobes greenish yellow to tan on inner surface when dry;

corolla not persisting after anthesis, blue to purple or purplish or pink-purple, lighter when dry, 11–15 mm.

calyx 5–8 mm, densely villous, lobes brown to reddish brown on inner surface when dry;

corolla persisting after anthesis, sometimes still present in mature fruit, purplish pink to red or rose-purple, distinctly dark reddish when dry, 7–10 mm.

straight, 25–50 × 4 mm, densely strigose to strigulose, hairs minute.

straight, 25–35 × 4–5 mm, loosely densely strigose-sericeous to villous-sericeous.

5–7.

7–12.