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.

sometimes with prickles along stem and leaf rachis, glabrous in age;

pith spongy becoming septate.

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.

10–30+ cm;

stipules 1–1.1 mm, with inner fold throughout, inner fold and base with stipitate, multicellular glands;

pulvinus at least 1/2 as long as petiole;

rachis glabrous, with stipitate glands in canal at base of each leaflet pair;

stipels narrow, ± glandular;

leaflets 20–80+, blades rectangular to oblong, base obtuse, apex truncate to obtuse, surfaces usually glabrous.

5–15+-flowered, racemes.

1–18+-flowered, racemes.

(0.6–)1.7–2.1(–4.1) cm.

(0.2–)1.6–1.9(–4.2) 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.

(1–)1.4–1.5(–1.9) cm;

calyx actinomorphic, lobes 5, subulate–acuminate, rim of tube glabrous or with short hairs inside, stalked glands absent;

corolla yellow-orange, banner with purple-maroon spots on outer surface;

banner ovate to obovate, base truncate, apex obtuse-retuse, calluses as shallow ridges or winglike along claw, callus apices truncate to rounded with lobes less than 2 mm;

wings with basal tooth (short, blunt);

keel yellow, apex purple or maroon, rounded-acute, curved upward to inward towards banner, with basal tooth;

stamens strongly curved inward within keel;

style recurved towards banner;

ovules (12–)29–36(–51).

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.

brown, with maroon-red mottling, narrow-elongate, terete to elliptic in cross section, straight to falcate, (8.3–)16.9–19.4(–23.5) × 0.3(–0.4) cm, beak connate, narrowly tapered, (0.3–)0.6–0.8(–1.1) cm, tardily elastic dehiscent;

stipe (0.2–)0.5(–0.7) mm.

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

(12–)29–36(–51), green-brown to reddish, often with purple-black mottling, columnar.

= 12.