Flora of North America species comparison

stellate hairs of younger stems dense, appressed, 4-armed, arms approximate in pairs, aligned with stem axis, lines of fine, curved hairs absent or obscured;

older growth grayish, rough, glabrescent.

additionally with line of fine, curved hairs.

stipules linear-subulate, 3–10 mm;

petiole primarily in distal 1/2, sometimes themselves shallowly pinnately lobed, surfaces scabridulous, hairs appressed-stellate, obscure nectary present abaxially on midvein near base.

stipules linear or linear-filiform, 2–6 mm;

petiole of lower leaf 2/3 to equaling blade, much shorter in inflorescence, with fine, curved hairs adaxially in addition to normal pubescence;

blade broadly to transversely ovate, 3–5-fid, sometimes lobed, often unlobed in inflorescence, 3.5–9.5 × 4.5–13.5 cm, narrower in inflorescence, base cordate to cuneate, lobes obovate to oblanceolate, margins coarsely and irregularly crenate-serrate, apex acute to short-acuminate, surfaces scabrous, slitlike nectary present abaxially at or near base of midvein.

solitary flowers in axils of distal leaves.

solitary flowers in axils of distal leaves, or appearing racemose by reduction of subtending leaves.

jointed below apices, to 17 cm, usually much exceeding subtending leaves;

involucellar bractlets 8–14, linear-subulate, 1–2 cm, margins ciliate.

inconspicuously jointed at base, to 1.5 cm;

involucellar bractlets 8–11, linear-subulate, 1–1.6 cm, margins not or inconspicuously ciliate, apex 2-fid, bristly-hairy.

erect or ascending;

calyx divided 3/4+ length, funnelform, 1.4–2.2 cm, equaling or slightly exceeding involucel, lobes narrowly lanceolate-triangular, margins ciliate, apices attenuate, nectaries absent;

corolla rotate, petals yellow to cream, usually with dark to obscure maroon lines basally, asymmetrically obovate to broadly obovate, 1.6–4 × 1–3.5 cm, margins ± entire, sparingly hairy abaxially where exposed in bud;

staminal column straight, yellow or cream, 0.6–1.4 cm, bearing filaments throughout, free portion of filaments not secund, 1–3 mm;

pollen yellow-orange;

styles cream, 1.5–5 mm;

stigmas maroon or cream.

horizontal or declinate;

calyx divided 2/3 length, campanulate, 1.6–2.8 cm, lobes triangular, with 3 prominent, often reddish ribs, 1 medial, 2 marginal, medial with prominent nectary, apices acute or acuminate, veins and sometimes spaces between them with conspicuous simple or few-armed, stellate hairs;

corolla funnelform, petals pale yellow to white, dark red basally, obovate, 5–8 × 2.5–5 cm, margins ± entire to crenate-dentate, sometimes undulate, minutely hairy abaxially where exposed in bud;

staminal column straight, dark red, 2–4.5 cm, bearing filaments ± throughout, free portion of filaments not secund, 1.5–2.5 mm;

pollen dark red;

styles dark red, pink, or white, 9–22 mm;

stigmas dark red, pink, or white.

pale olivaceous gray with darker median stripe on each valve, ovoid or ellipsoid, 0.7–1.7 cm, to 2/3 calyces, apex rounded, hairy near apex or glabrous throughout.

medium brown to stramineous, ovoid, 1.2–2 cm, apex acute to acuminate, variously antrorsely hispid, more minutely stellate-hairy.

dark brown, angulately reniform-ovoid, 2.4–3 mm, silky-hairy ± throughout.

reddish brown to dark brown, sometimes with raised, pale concentric lines, angulately reniform-ovoid, 3.3–4.5 mm, sparingly to moderately papillose-verrucose.

= 72.