Flora of North America species comparison

glabrous or pilose, hairs persistent, close-pressed, golden or clear in age, developing leaves and young stems with same pubescence of simple hairs;

pith solid or spongy.

glabrous in age;

pith spongy.

13–25+ cm;

stipules 0.3–0.4 cm, with conspicuous inner fold throughout, hairs dense, close-pressed, inner fold and base with stipitate, multicellular glands;

pulvinus slightly more than 1/2 as long as petiole;

rachis ± sericeous, without stipitate glands, obscure gland(s) present at petiolule base;

stipels reduced in size between successive leaflets, long-filamentous glandular;

leaflets 28–36+, blades elliptic-ovate to oblong, base acute, apex obtuse to acute, surfaces silky sericeous abaxially, usually glabrous adaxially.

12–19 cm;

stipules 0.2–0.4 cm, with inconspicuous inner fold throughout, inner fold and base with stipitate, multicellular glands or glabrous;

pulvinus less than 1/2 as long as petiole;

rachis ± glabrous, without stipitate glands in canal;

stipels narrow obscure glands;

leaflets 16–50+, blades elliptic-ovate to oblong, base acute, apex obtuse, surfaces glaucous, usually glabrous abaxially, sometimes with diffuse, close-pressed hairs.

5–15+-flowered, racemes.

1–12-flowered, racemes.

(0.6–)1.7–2.1(–4.1) cm.

(0.9–)1.7–1.8(–3) cm.

(0.7–)0.9–1(–1.3) cm;

calyx ± zygomorphic, lobes 5, short-acuminate, rim of tube villose, stalked glands between abaxial lobes absent in fruit;

corolla yellow, banner venation sometimes darker;

banner ovate, base cordate-truncate, apex emarginate, becoming strongly reflexed and contorted, calluses as relatively small, acute teeth at claw base, thickened, knoblike at base of blade/top of claw;

wings without basal tooth;

keel ± same color throughout, apex acute, curved strongly inward, without basal tooth;

stamens incurved within keel;

style recurved;

ovules 4–6.

(0.9–)1.3–1.5(–1.7) cm;

calyx ± zygo-morphic, deciduous before fruits mature, lobes 5, short-deltate, rim of tube with spreading hairs, stalked glands usually present between abaxial lobes;

corolla pale yellow;

banner ovate, base truncate-obcordate, apex emarginate, calluses as relatively small ridges at claw base, forming a pocket, thickened, knoblike at top of claw;

wings without basal tooth;

keel ± same color throughout, apex rounded-obtuse, curved upward to slightly outward in apical tooth, without basal tooth;

stamens curved upward;

style curved upward with stamens;

ovules 4–9.

red- to gray-brown, without horizontal mottling in age, 4-angled, square in cross section, straight or slightly falcate, (0.8–)4.4–5.5(–6.5) × (0.7–)0.8(–0.9) cm, thick, woody, seed chambers apparent in young fruits becoming obscure at maturity, margins of young fruits with shallow thin ridges resembling early wings of S. punicea or S. drummondii, ridges becoming thickened and rounded at maturity, beak short-pyramidal, (0.2–)0.4–0.7(–1.3) cm, indehiscent;

stipe (0.4–)0.5–0.6(–0.9) cm.

light tan to reddish brown, 4-angled, with pronounced torulose wings, square in cross section, straight, (3.2–)5.7–6.2(–9.3) × 0.8(–0.9) mm, seed chambers clearly visible externally, beak short- to long-pyramidal, (0.4–)0.7–0.8(–1.3) cm, indehiscent or tardily dehiscent;

stipe (1.1–)1.6(–2) cm.

(1–)4 or 5(or 6), reddish brown to gray, without mottling, reniform-orbicular.

(1–)3 or 4(–9), dark reddish brown, without mottling, reniform-orbicular.

= 12.

= 12.