Flora of North America species comparison

erect, simple to loosely clustered, terete, 15–95 cm, simple to well branched, densely strigillose, often mixed glandular puberulent on inflorescence, rarely with faint strigillose lines decurrent from margins of petioles.

erect, terete, (1–)4–65 cm, usually with several erect or ascending virgate branches proximally or simple, densely villous, sometimes mixed strigillose, or sometimes subglabrous.

opposite proximally, usually alternate, rarely fasciculate distally, subsessile;

blade linear to very narrowly elliptic or sublanceolate, 2–7.5 × 0.1–0.7 cm, usually longer than internodes, base rounded to subcuneate, margins subentire, 4–7 inconspicuous teeth per side, sometimes revolute, lateral veins inconspicuous, apex obtuse proximally to acute distally, both surfaces densely strigillose, increasing distally;

bracts not much reduced.

opposite only in proximal pairs, distally alternate, subsessile, blade linear-lanceolate to very narrowly elliptic, 0.5–4.5 × 0.2–0.3(–0.6) cm, usually longer than internodes, base cuneate, margins subentire to sparsely serrulate, 2–5 low teeth per side, lateral veins obscure, 2–5 per side, apex acute, surfaces subglabrous proximally to densely villous and/or strigillose distally;

bracts slightly reduced.

erect racemes, densely strigillose, often mixed sparsely glandular puberulent.

erect spikes, simple or sparsely branched, ± densely villous and/or strigillose.

erect;

buds 3–5 × 1.5–2.5 mm;

pedicel 5–12 mm;

floral tube 0.8–1.5 × 1.2–1.8 mm, ring of spreading hairs at mouth inside;

sepals 2.5–4.5 × 0.9–1.3 mm, abaxial surface strigillose;

petals obcordate, white to light pink, 3.5–7 × 1.6–4 mm, apical notch 1–1.8 mm;

filaments white or cream, those of longer stamens 0.8–3.5 mm, those of shorter ones 0.6–2.5 mm;

anthers cream, 0.5–0.9 × 0.4–0.6 mm;

ovary 12–18 mm, densely strigillose, sometimes mixed glandular puberulent;

style cream, 2–3.8 mm, stigma narrowly clavate, entire, 1–1.8 × 0.5–1.2 mm, usually surrounded by, rarely exserted beyond, anthers.

erect, often initiating in most proximal nodes, usually cleistogamous;

buds 0.8–1.5 × 0.5–1 mm;

floral tube 0.4–1 × 0.6–1.2 mm, ring of lax hairs near base inside;

sepals 0.7–2 × 0.4–0.8 mm;

petals pink with darker veins or white, 1.2–3.2 × 0.9–1.8 mm, apical notch 0.4–1 mm;

filaments pale pink, those of longer stamens 0.4–1.8 mm, those of shorter ones 0.3–1 mm;

anthers 0.3–0.6 × 0.3–0.4 mm, apiculate;

ovary 3–6 mm, densely pubescent;

style pale pink, 1.2–2.8 mm, stigma clavate to subcapitate or irregularly 4-lobed, 0.5–1.2 ×0.3–0.6 mm, surrounded by longer anthers.

straight, narrowly cylindrical, 35–80 mm, surfaces densely strigillose;

pedicel 10–35 mm.

cylindrical to subfusiform, terete to slightly 4-angled, (6–)8–14 × 1.1–2 mm, beak 2–3 mm, central column disintegrating, villous;

sessile.

narrowly fusiform to narrowly obovoid, 1.5–2.2 ×0.5–0.7 mm, chalazal collar 0.1–0.2 mm, ± pronounced, surface papillose;

coma persistent, dingy white, 6–8 mm.

3–6 per locule, irregularly angular-oblong or fusiform, 0.9–1.6 × 0.4–0.9 mm, chalazal collar absent, brown, surface irregularly reticulate.

= 36.

= 18.