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.

also 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-lanceolate, 10–16 mm, ciliate;

petiole mostly 2/3 to equaling blade, with fine, curved hairs adaxially, sometimes sparingly prickly;

blade broadly to transversely triangular-ovate, mostly 5-fid, 4.5–15 × 6–17 cm, base truncate or broadly and shallowly cordate, margins serrate, apex acuminate, segments lanceolate, surfaces glabrous but veins sometimes with retrorse prickles abaxially, nectary sometimes present abaxially on midvein near base.

solitary flowers in axils of distal leaves.

solitary flowers in axils of distal leaves.

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

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

jointed near middle, to 1.5 cm, prickly distal to joint;

involucellar bractlets 8–10, flattened or canaliculate, 1–1.8 cm, margins setose, apex simple, 2-fid, or appendaged, spreading in flower to reflexed in fruit.

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 ascending;

calyx divided 2/3+ length, cylindric-campanulate, 1.5–2.5 cm, accrescent, lobes narrowly triangular, with 3 prominent, setose ribs, 2 marginal, 1 medial, these often darker and with stinging bristly hairs, apices acuminate-attenuate, nectary absent;

corolla rotate, petals usually dark red to rose-purple, rarely yellow, with dark purple basally, asymmetrically obovate, 3.5–7 × 3–5.5 cm, margins repand, finely hairy abaxially where exposed in bud;

staminal column straight, maroon, 2.4–3.5 cm, bearing filaments nearly throughout, free portion of filaments not secund, mostly 1.5–2.5 mm;

pollen dull yellow;

styles maroon, 1.5–3 mm;

stigmas dark maroon.

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.

pinkish brown, ovoid, 1.8–2.5 cm, apex acute, apiculate, antrorsely hispid, hairs readily deciduous, simple.

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

dark olivaceous, with fine, raised, concentric lines, angulately reniform-ovoid, 4.2–4.8 mm, moderately verrucose-lepidote, scales striate-fimbriate.

= 72 (Trinidad, where cultivated).