Flora of North America species comparison

slender, filiform, mainly with whitish or pale hairs.

stipules lanceolate or ovate-lanceolate, 3.5–8.5 × 1–3 mm, in younger stems basally connate, sparsely strigillose;

petiole 2.5–9.5(–17) cm, covered with retrorse hairs;

rachis 1–1.5(–3.5) cm, covered with antrorse hairs;

stipels narrowly triangular, relatively small;

lateral leaflet blades asymmetrically ovate to broadly ovate, smaller than terminal;

terminal blade broadly ovate to rhomboid-ovate, 3–10.5 × 1.6–8 cm, base rounded, apex acute, rarely with mucro.

2–6 cm, 6–12 floral nodes;

bracts firm, widely ovate to truncate at apex, flabellate or bilobed, 2–5 × 1–3.5 mm, often silky-canescent.

chasmogamous with pedicels 2–5 mm;

calyx 5–8 × 3 mm, cleistogamous 3 × 1 mm, lobes triangular to lanceolate, 1–2 mm;

corolla becoming darker in age;

banner obovate to suborbiculate, 13–15 × 4–5 mm;

wings oblong, with claws 7 mm, auriculate above claws;

keel similar to wings;

ovary pubescent.

those of chasmogamous and cleistogamous aerial flowers oblong to slightly falcate, narrow at base and apex, 3–3.7 × 0.7 cm;

valves strigose or glabrous, sutures with mostly ascending hairs or often at base with retrorse hairs.

2 or 3(or 4) in chasmogamous and cleistogamous aerial fruits, dark red-brown, 3.5–4 × 3 mm;

hilum reniform to broadly ovate, 1.5 mm;

subterranean 1–1.5 cm diam. 2n = 22.