Flora of North America species comparison

strict, erect, sometimes reddish green, terete, 3.5–40 cm, simple or freely branched, subglabrous proximally to strigillose and glandular puberulent distally.

erect, subterete, (20–)40–85(–120) cm, freely branched distally, subglabrous proximal to inflorescence, often with raised strigillose lines decurrent from petioles, densely strigillose distally.

alternate distally, not fasciculate, petiole 0–2 mm, blade subspatulate proximally to lanceolate, oblanceolate, or narrowly elliptical distally, not folded along midrib, 0.9–2.5 × 0.2–0.6 cm, shorter than internodes, base tapered, margins entire or scarcely denticulate, 1–4 teeth per side, lateral veins obscure, apex subacute or often blunt proximally, surfaces subglabrous or with scattered hairs along margins;

bracts much reduced, sometimes attached to pedicel.

opposite proximal to inflorescence, alternate distally, petiole 4–10 mm;

blade narrowly lanceolate to lanceolate or narrowly elliptic, 3–10(–15) × 0.5–3 cm, subequal to internodes, base rounded to cuneate, margins sharply and irregularly serrulate, 30–75 teeth per side, veins prominent, often raised abaxially, 10–25 per side, apex acute or acuminate, surfaces subglabrous with strigillose margins and abaxial veins;

bracts abruptly reduced.

erect racemes or open panicles, relatively loose and uncrowded, branches thin, mixed strigillose and glandular puberulent.

usually upright panicles, sometimes corymbiform, rarely racemes, densely strigillose.

erect or, sometimes, nodding in bud;

buds broadly ovoid, 1.2–2.5 × 1–1.5 mm;

floral tube 1.1–1.5 × 1–1.4 mm, usually with ring of spreading hairs at mouth inside;

sepals 0.5–2.5 × 0.4–1.3 mm, apex acute, abaxial surface strigillose, sometimes mixed glandular puberulent;

petals white to pink, 2–5 × 1.5–3 mm, apical notch 0.2–1.9 mm;

filaments white, those of longer stamens 0.5–3 mm, those of shorter ones 0.3–2 mm;

anthers 0.6–1 × 0.5–0.8 mm;

ovary 4–9 mm, mixed strigillose and glandular puberulent;

style light pink, 1–3.5 mm, stigma subclavate to obscurely 4-lobed, 0.4–0.6 × 0.4–0.5 mm, surrounded by longer anthers.

erect;

buds 2–3 × 1.5–2.5 mm;

pedicel 5–10 mm;

floral tube 0.3–0.6 × 0.3–0.5 mm, raised ring of sparse spreading hairs at mouth inside;

sepals 1.3–3.2 × 0.5–1.5 mm, abaxial surface strigillose;

petals white, 2.5–5.5 × 2–3.8 mm, apical notch 0.5–1 mm;

filaments white, those of longer stamens 1.8–2.5 mm, those of shorter ones 1.5–2 mm;

anthers pale yellow, 0.3–0.4 × 0.2–0.4 mm;

ovary 15–30 mm, ± densely strigillose;

style erect, white, 1.5–2.8 mm, glabrous, stigma cylindrical to subcapitate, entire, 1–1.5 × 0.8–1.2 mm, surrounded by longer anthers.

9–28 mm, surfaces strigillose and glandular puberulent;

pedicel 3–10 mm.

40–65 mm, surfaces strigillose;

pedicel 8–12 mm.

obovoid, without constriction, 0.9–1.2 × 0.4–0.6 mm, low chalazal collar 0.1–0.2 mm wide, brown, surface reticulate;

coma easily detached, white, 2.5–3 mm.

narrowly oblanceoloid, 1.2–1.7 × 0.3–0.5 mm, abruptly rounded with very short chalazal neck, brownish gray, surface evenly papillose;

coma not easily detached, cinnamon red, 8–12 mm.

= 26.

= 36.