Flora of North America species comparison

prostrate or climbing, branched, angular (3-sided), 40–200 cm, uncinate-pubescent and villous.

trifoliolate;

stipules usually persistent, sometimes caducous, ovate-deltate, 5.5–12 mm;

petiole 4–8 cm;

leaflet blades ovate, elliptic to broadly ovate, or rhombic, apex acute to acuminate, surfaces more densely sericeous abaxially, sparsely to densely sericeous adaxially;

terminal blade 35–100 × 24–60 mm, length 2.5–3 times width.

branched or unbranched;

rachis patent-villous and uncinate-pubescent to puberulent;

primary bracts densely imbricate before anthesis, caducous, narrowly ovate, 7–10 mm.

4–8 mm.

calyx 3–5 mm, sparsely puberulent throughout, lobes often villous, tube 1 mm;

abaxial lobes 4–5.5 mm, lateral lobes 2.5–4 mm;

corolla purple, fading blue-green, 7–9 mm.

sutures crenate or somewhat angled abaxially, sinuate adaxially;

connections adaxial, 1/2 as broad as segments;

segments 5–9, semiorbiculate, 3–4 × 2–2.5 mm, obliquely rounded abaxially, slightly angled adaxially, uncinate-pubescent;

stipe 1–2 mm.

= 22.