Flora of North America species comparison

erect, green or tan to reddish green, terete, (3–)10–120(–190) cm, often thick, well branched or simple, subglabrous proximal to inflorescence with raised strigillose lines decurrent from margins of petioles, ± densely mixed strigillose and glandular puberulent distally, rarely densely strigillose or densely villous throughout.

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 proximal to inflorescence, alternate distally, petiole 0–5(–10) mm, often subsessile distally, sometimes clasping;

blade narrowly obovate, obovate, broadly elliptic, or spatulate proximally, to very narrowly lanceolate to ovateor broadly elliptic distally, (1–)3–12(–16) × (0.2–)0.6–5.5 cm, base rounded to cuneate or short-attenuate, margins serrulate, (8–)15–40 irregular teeth per side, veins prominent, 4–10 per side, apex obtuse to acute or subacuminate, surfaces usually subglabrous with strigillose margins, rarely densely strigillose or villous;

bracts scarcely reduced to very reduced and narrower.

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.

usually erect, rarely nodding, racemes or panicles, well branched and open, to simple and congested, ± densely strigillose and glandular puberulent.

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

erect;

buds 1.5–7 × 1–3 mm;

pedicel 2–14(–20) mm;

floral tube 0.5–2.6 × 0.9–3.5 mm, ring of spreading hairs at mouth inside;

sepals often reddish green, lanceolate, sometimes keeled, 2–7.5 × 0.7–2.5 mm;

petals white or pink to rose-purple, obovate, 2–14 × 1.3–6.3 mm, apical notch 0.4–2.5 mm;

filaments white to dark pink, those of longer stamens 1.4–7 mm, those of shorter ones 0.6–5.2 mm;

anthers light yellow to cream, 0.5–1.8 × 0.3–0.9 mm;

ovary often reddish green, 8–40 mm, ± densely mixed strigillose and glandular pubescent;

style cream to light yellow, 1.1–8.5 mm, stigma cream to orange-yellow, narrowly to broadly clavate or subcapitate, 0.8–2.8 × 0.4–1.2 mm, rarely indented apically, 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.

erect, (15–)30–100 mm, surfaces usually strigillose and glandular puberulent, rarely glabrescent;

pedicel 2–15(–40) mm, rarely subsessile.

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 obovoid or subfusiform, (0.6–)0.8–1.6(–1.9) × 0.3–0.6 mm, chalazal collar ± conspicuous, 0.1–0.3 × 0.2–0.4 mm, grayish tan to brown, surface with conspicuous parallel longitudinal ridges of laterally flattened papillae;

coma readily detached, white or dingy white, 2–8 mm, very rarely absent.

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.