Flora of North America species comparison

erect or ascending, to 300 cm, pubescent or glabrescent.

prostrate, 100–200(–300) cm, sparsely to densely patent-pubescent and uncinate-puberulent.

trifoliolate;

stipules usually persistent, narrowly ovate-deltate, 5–10 mm;

petiole usually 15–20 mm;

leaflet blades elliptic to ovate, apex obtuse or acute, surfaces finely spreading-villosulous to substrigose abaxially, uncinate-puberulent or glabrescent adaxially;

terminal blade 20–90 × 15–45 mm, length 1.5–4 times width.

trifoliolate;

stipules often caducous, sometimes persistent, ovate or narrowly ovate, 4.5–8 mm;

petiole 28–50 mm;

leaflet blades ovate or rhombic-ovate, lateral veins inconspicuous, arcuate along margin, apex acute or obtuse, surfaces sparsely strigose;

terminal blade 30–70 × 20–50 mm, length 1.4–2 times width.

unbranched;

rachis densely patent uncinate-pubescent;

primary bracts caducous, narrowly ovate, 6–7 mm.

lax-flowered, ascending, terminal and branched, also axillary and unbranched;

rachis uncinate-puberulent;

primary bracts caducous, ovate, 3–4 mm.

persistent with calyx-remnant at top after loments drop, 5–9 mm.

7–9 mm.

calyx 2–3.5 mm, uncinate-puberulent, lobes pilose, tube 1 mm;

abaxial lobes 1.5–2.5 mm, lateral lobes 1–2 mm;

corolla purple, 5–8 mm.

calyx 2.5–3.5 mm, uncinate-puberulent, tube 1 mm;

abaxial lobes 2 mm, lateral lobes 1.5 mm;

corolla purple, 8–9.5 mm.

sutures symmetrically crenate abaxially, straight or slightly sinuate adaxially;

connections central, 1/2–2/3 as broad as segments;

segments 4–8, semiobovate, 3.5–5 × 2.5–3 mm, broadly rounded abaxially, straight or barely convex adaxially, uncinate-puberulent;

stipe 1.5–2 mm.

sutures obtusely dentate abaxially, sinuate adaxially;

connections adaxial, 1/4–1/3 as broad as segments;

segments 3 or 4, deltate-rhombic, 6–8 × 4–5 mm, obtusely angled abaxially, straight or slightly convex adaxially, uncinate-pubescent;

stipe 2 mm.

= 22.