Flora of North America species comparison

strict, erect, terete, 2–50(–60) cm, rarely branched only in larger plants, subglabrous proximal to inflorescence except for raised strigillose lines decurrent from margins of petioles, or sometimes ± densely long-villous throughout with inconspicuous decurrent lines.

erect or ascending, terete, 10–50 cm, branched at base and apically, densely strigillose throughout, sometimes mixed villous distally.

opposite proximally, alternate on inflorescence, subsessile or proximally with petioles 1–1.5 mm;

blade ovate proximally to lanceolate or narrowly elliptic distally, 0.5–4.7 × 0.2–1.4 cm, base rounded to cuneate, margins subentire proximally to denticulate distally, 8–20 teeth per side, veins inconspicuous, 3–6 per side, apex obtuse to subacute, surfaces mostly glabrous with strigillose margins;

bracts much reduced.

proximal pairs often early-deciduous, petiole 1–4 mm, blade lanceolate-elliptic to narrowly so, ± folded along midrib, 0.9–1.7 × 0.2–0.6 cm, shorter than internodes, base attenuate or narrowly cuneate, margins denticulate, 6–10 low teeth per side, lateral veins inconspicuous or absent, apex acute with deciduous, rigid mucronate gland, surfaces usually glabrescent with scattered hairs on abaxial midrib, rarely strigillose-villous throughout;

bracts much reduced, sublinear, often attached to pedicel.

usually nodding in bud, erect later, open racemes, sometimes congested, usually mixed strigillose and glandular puberulent, rarely also mixed villous, or rarely subglabrous.

erect, open racemes or panicles, strigillose, often mixed glandular puberulent.

erect;

buds 2–5 × 1–2 mm;

pedicel 3–8 mm;

floral tube 0.5–1.7 × 0.8–1.6 mm, with slightly raised ring of spreading hairs at mouth inside;

sepals green, 1.2–2.8 × 0.5–1 mm, abaxial surface subglabrous or sparsely glandular puberulent;

petals white, often fading pink, 1.6–5.5 × 1.2–3 mm, apical notch 0.3–1.2 mm;

filaments white or cream, those of longer stamens 0.6–2.5 mm, those of shorter ones 0.4–1.5 mm;

anthers cream, 0.2–0.9 × 0.2–0.5 mm;

ovary 10–14 mm, strigillose and glandular puberulent or subglabrous;

style cream, 0.8–5 mm, stigma clavate, entire, 0.4–1.2 × 0.3–0.7 mm, usually surrounded by, rarely exserted beyond, anthers.

erect to ± nodding;

buds rounded-obovoid, 5–6 × 3–4 mm;

floral tube with slight constriction 2–3 mm distal to base, 2.7–3.2(–5) × 1.8–2.5(–3.1) mm, without ring or scales inside, glabrous;

sepals erect or sometimes deflexed in late anthesis, green or reddish green, lanceolate, 2.6–4.2 × 0.9–1.3 mm, apex acute;

petals deep rose-purple, obcordate, 5–7.2 × 3.2–4.1 mm, apical notch 2–3 mm;

filaments cream or white, those of longer stamens 5–7.5 mm, those of shorter ones 3.5–5.5 mm;

anthers cream, 1–1.8 × 0.5–0.8 mm, scarcely apiculate;

ovary 2.5–3.8 mm, densely strigillose and/or glandular puberulent;

style cream, 6–9.5 mm, glabrous, stigma 4-lobed, 0.8–1.2 × 1–1.5 mm, lobes reflexed or sometimes incompletely spread, then forming cup-like structure, exserted beyond longer anthers.

very narrowly cylindrical, (15–)24–60 mm, surfaces usually subglabrous to mixed strigillose and glandular puberulent, rarely sparsely villous;

pedicel 8–40 mm.

erect, subfusiform, 8–12 mm, surfaces strigillose and/or glandular puberulent;

pedicel 1–1.8 mm.

narrowly fusiform to narrowly obovoid, 1.1–1.6 × 0.4–0.6 mm, chalazal collar ± conspicuous, 0.05–0.2 mm, light brown, surface papillose;

coma easily detached, white, 3–6 mm.

obovoid, with constriction 0.6–1 mm from micropylar end, 2.1–2.9 × 1.2–1.5 mm, very inconspicuous chalazal collar 0.05–0.06 mm wide, dark brown, surface low papillose, papillae often with central pit;

coma easily detached, white, 6–7.5 mm.

= 36.

= 30.