Flora of North America species comparison

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

1–5, erect to ascending, unbranched, 7–20 cm, strigose to pilose, not 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.

alternate, sessile, stipular colleters absent;

blade linear to filiform, 2.5–8 × 0.1–0.2 cm, membranous, base cuneate, margins entire, apex acute, mucronate, venation obscure, surfaces strigose to glabrate, margins sparsely ciliate to glabrate, laminar colleters absent.

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.

extra-axillary at upper nodes, appearing terminal, sessile or pedunculate, 2–5-flowered (appearing greater because umbels are in close proximity);

peduncle 0–0.1 cm, densely strigose, bracts few.

7–13 mm, pilosulous.

6–15 mm, strigose to pilose.

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 lance-ovate, 1.5–2 mm, apex acute, strigose to pilose;

corolla red-violet, lobes reflexed or sometimes spreading, oval, 2.5–4 mm, apex acute, pilose abaxially, glabrous adaxially;

gynostegial column 0.5 mm;

fused anthers brown, cylindric, 1.5–2 mm, wings right-triangular, apical appendages ovate;

corona segments white, sessile, cupulate, 1.5 mm, exceeded by style apex, base saccate, apex truncate with a proximal tooth on each side, glabrous, internal appendage lingulate, barely exserted from cavity, glabrous;

style apex shallowly depressed, pink to reddish.

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

coma 2.5–3 cm.

oval, 9–11 × 4–6 mm, margin corky, winged, erose, faces ruglose-papillate, minutely hirtellous;

coma 1.5 cm.

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

pendulous on spreading to declined pedicels, lance-ovoid, 3–6 × 0.5–0.8 cm, apex attenuate, smooth, faintly striate, strigose.

= 22.