Flora of North America species comparison

1 (rarely 2 or 3), erect, sparingly branched, arrested vegetative branches absent, 35–90 cm, sparsely puberulent with curved trichomes in lines, not glaucous, rhizomatous.

1–4, erect to spreading, unbranched or rarely branched near base, 6–30 cm, puberulent with curved trichomes to hirtellous, not glaucous, rhizomes absent.

3–6-whorled, sessile, with 1 stipular colleter on each side of leaf base on a ciliate interpetiolar ridge;

blade linear, 1.5–7 × 0.1–0.2 cm, chartaceous, base cuneate, margins entire, apex acute, mucronate, venation obscure, surfaces glabrous abaxially, puberulent with curved trichomes adaxially, especially on midvein, to glabrate, margins ciliate, laminar colleters absent.

persistent or gradually caducous from base, opposite, sessile or petiolate, with 1 stipular colleter on each side of petiole;

petiole 0–17 mm, puberulent with curved trichomes to hirtellous;

blade elliptic to lanceolate or lance-ovate, 3–7.5 × 0.4–2.5 cm, chartaceous, base cuneate, margins often crisped, apex acute, venation eucamptodromous, surfaces hirtellous, usually conduplicate, laminar colleters absent.

extra-axillary at upper nodes, pedunculate, 7–28-flowered;

peduncle 0.8–4 cm, puberulent with curved trichomes on 1 side, with 1 caducous bract at the base of each pedicel.

extra-axillary, sessile or pedunculate, 4–8-flowered;

peduncle 0–2 cm, hirtellous, with 1 caducous bract at the base of each pedicel.

6–10 mm, puberulent with curved trichomes.

7–10 mm, hirtellous.

erect to spreading;

calyx lobes lanceolate, 1.5–2 mm, apex acute, puberulent with curved trichomes to glabrate;

corolla pale green to cream or ochroleucous, sometimes tan-tinged, lobes reflexed with spreading tips, elliptic, 3–4 mm, apex acute, glabrous abaxially, minutely papillose at base adaxially;

gynostegial column 1–1.2 mm;

fused anthers green, columnar, 1.2–1.5 mm, wings narrowly right-triangular, closed, apical appendages deltoid;

corona segments cream, stipitate, cupulate, dorsally flattened, 1.5–2 mm, exceeded by style apex, apex obtuse, margin shallowly lobed (sometimes obscure) to sharply toothed proximally, glabrous, internal appendage acicular, exserted, arching over style apex, glabrous;

style apex shallowly depressed, green to greenish cream.

erect;

calyx lobes linear-lanceolate to narrowly elliptic, 3–4 mm, apex acute, hirtellous;

corolla green, sometimes tinged red or brown, faintly striate, lobes reflexed, elliptic, 5–7 mm, apex acute, hirtellous throughout or glabrate at tips abaxially, glabrous adaxially;

gynostegial column 0.5–1 mm;

fused anthers green, obconic, 1–1.5 mm, wings trapezoidal, closed, apical appendages ovate;

corona segments proximally green, distally white or cream, sessile, tubular, 3.5–5.5 mm, greatly exceeding style apex, apex flared, deeply emarginate, minutely papillose, internal appendage lingulate, sharply incurved, at the same level as and closing the segment apex, minutely papillose.

ovate, 6–7 × 4–5 mm, margin winged, faces smooth;

coma 2.5–3.5 cm.

oval, 7 × 5–6 mm, margin winged, faces smooth;

coma 2.5–3.5 cm.

erect on straight pedicels, narrowly fusiform, 6–11 × 0.4–0.8 cm, apex acuminate to attenuate, smooth, glabrous.

erect on upcurved pedicels, lance-ovoid, 5–9 × 1.2–2 cm, apex attenuate to acuminate, smooth, puberulent with curved trichomes to hirtellous, sometimes faintly striate.

= 22.