Flora of North America species comparison

solitary, erect to ascending, unbranched (rarely), (10–)20–125 cm, puberulent with curved trichomes, not glaucous, rhizomes absent.

1–few, erect, unbranched, 30–120 cm, puberulent with curved trichomes, sometimes in a single line, sometimes glaucous, rhizomes absent.

opposite to subopposite, sessile or petiolate, with 1 or 2 stipular colleters on each side of petiole and also in axil;

petiole 0–5 mm, puberulent with curved trichomes;

blade linear to broadly oval or nearly orbiculate, 2–13 × 0.8–6 cm, chartaceous, base cuneate to rounded, margins entire or crisped, apex acute or obtuse to truncate or emarginate, mucronate, venation brochidodromous, surfaces sparsely pilosulous to glabrate, margins ciliate, laminar colleters absent.

opposite, petiolate, with 1 or 2 stipular colleters on each side of petiole;

petiole 10–25 mm, puberulent with curved trichomes;

blade oval to ovate, obovate, lanceolate, or oblanceolate, 6–15 × 3–9 cm, subcoriaceous, base cuneate to obtuse or subtruncate, margins sometimes crisped, apex rounded to obtuse, apiculate or mucronate, venation eucamptodromous to faintly brochidodromous, surfaces puberulent on veins with curved trichomes, sometimes glaucous, margins ciliate, 8–12 laminar colleters.

extra-axillary at upper nodes, sometimes branched at peduncle apex, sessile or pedunculate, 22–60-flowered;

peduncle 0–4 cm, puberulent with curved trichomes to pilosulous, with 1 caducous bract at the base of each pedicel.

terminal, branched, also usually extra-axillary at 1 distal node, pedunculate, 11–28-flowered;

peduncle 1–7 cm, densely puberulent with curved trichomes, with 1 caducous bract at the base of each pedicel.

7–13 mm, pilosulous.

12–20 mm, densely puberulent with curved trichomes.

erect to pendent;

calyx lobes narrowly lanceolate, 2–3 mm, apex acute, pilosulous;

corolla green to yellowish green, sometimes tinged red, lobes reflexed, oblong, 5–7 mm, apex acute, inconspicuously pilosulous at apex abaxially, glabrous adaxially;

gynostegium sessile;

fused anthers green, cylindric, 3–4 mm, wings triangular, widest at middle, closed, apical appendages ovate, marginally inflexed, apically deflexed;

corona segments green to cream, sometimes tinged red, sessile, laminar, margins incurved, appressed to column, 3–4 mm, greatly exceeded by style apex, apex obtuse, glabrous, internal appendage absent or obscure, glabrous;

style apex shallowly depressed, green.

erect to spreading;

calyx lobes lanceolate, 2–3 mm, apex acute, pilosulous;

corolla white, red-violet in throat, lobes reflexed with spreading tips, elliptic, 6–8 mm, apex acute, glabrous abaxially, minutely papillose at base adaxially;

gynostegial column red-violet, 1–2 mm;

fused anthers brown, truncately obconic, 1.5–2 mm, wings right-triangular, rounded, closed, apical appendages ovate;

corona segments white, stipitate, conduplicate with a lateral flange on each side, 2.5–4 mm, exceeding style apex, apex truncate, glabrous, internal appendage falcate, exserted, sharply inflexed over style apex, glabrous;

style apex shallowly depressed, white.

ovate, 7–8 × 4–5 mm, margin winged, faces minutely rugulose;

coma 2.5–3 cm.

ovate, 5–7 × 3–5 mm, margin winged, faces rugulose;

coma 2.5–4 cm.

erect on upcurved pedicels, fusiform to lance-ovoid, 6–10 × 1.5–2 cm, apex acuminate to attenuate, smooth, pilosulous.

erect on upcurved pedicels, narrowly fusiform, 10–15 × 1.5–2 cm, apex long-acuminate, smooth, pilosulous.

= 22.