Flora of North America species comparison

blades ovate to subspheric, unlobed or acutely 3-lobed, 5–10(–30) cm, base closed-cordate.

blades ovate to transversely ovate, unlobed or with low hiplike lobe on either side, 5–13 cm, base mostly open-cordate.

terminal, usually open panicles or cymes, individual units 2+-flowered, sometimes solitary flowers.

usually dense or open cymes, sometimes solitary flowers.

calyx campanulate, smooth or ribbed, (7–)8–13.5 mm, subequal or slightly exceeding fruits, lobes ovate to triangular, (3–)4–6.5 × (3–)4–5.5 mm;

corolla orange-yellow, (12–)15–25 mm;

staminal column 10 mm, including filaments.

calyx campanulate, densely tawny-hairy, strongly 10-ribbed at base, 8–12 mm, subequal to fruits, lobes keeled, ovate to deltate-ovate, (3–)4–8 × 4–6 mm;

corolla yellow to orange-yellow, 13–20 mm;

staminal column to 12 mm including filaments.

reddish brown to blackish, 2.3–3 mm.

grayish with reddish-brown raphe, 2.7–3 mm.

moderately dorsolaterally constricted, 7–9 mm including dorso-apical apiculus or spine to 1.5(–2) mm, stellate- and glandular-hairy, endoglossum absent.

strongly dorsolaterally constricted, 7.5–10 mm including dorso-apical apiculus or spur 0.5–2 mm, densely tawny stellate-hairy, endoglossum narrow, stout, spearlike, nearly reaching ventral suture.

= 16.

= 16.