Flora of North America species comparison

erect, strict, terete, 4–55 cm, simple or well branched in age, subglabrous proximally to mixed strigillose and glandular puberulent distally, with raised strigillose lines decurrent from margins of petioles.

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

opposite proximal to inflorescence, alternate and reduced distally, often ± appressed, usually subsessile, rarely petiole 1–3 mm, often clasping;

blade obovate proximally to ovate, lanceolate, or narrowly elliptic distally, 1–5.5(–6.5) × 0.4–2(–2.4) cm, base rounded or obtuse, margins low denticulate, 9–30 teeth per side, veins ± conspicuous, 3–6 per side, apex subacute, surfaces subglabrous 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.

erect, sometimes nodding in bud, racemes, sometimes sparsely branched.

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

erect;

buds 2–3.5 × 1.8–2.5 mm;

pedicel 0–1 mm;

floral tube 0.8–1.4 × 0.8–1.9 mm, ring of sparse spreading hairs at mouth inside;

sepals sometimes flushed red, 1.2–3.5 × 0.6–1.4 mm, abaxial surface strigillose and sometimes mixed glandular puberulent;

petals usually white, infrequently pink, 2.2–5(–7) × 1.7–3.2 mm, apical notch 0.4–1.5 mm;

filaments usually cream, rarely light pink, those of longer stamens 2–3.5 mm, those of shorter ones 1–2 mm;

anthers cream to light yellow, 0.3–0.8 × 0.3–0.5 mm;

ovary 9–30 mm, densely strigillose and glandular puberulent;

style cream or yellow, 1.6–2.8 mm, stigma usually narrowly to broadly clavate, rarely subcapitate, 1–3 × 0.8–2 mm, surrounded by at least longer 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.

30–55(–70) mm, surfaces mixed strigillose and glandular puberulent; usually subsessile, rarely pedicel 1–5 mm, often appressed to stem.

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

pedicel 1–1.8 mm.

very narrowly obovoid, 1–1.6(–1.8) × 0.4–0.6 mm, chalazal collar 0.1–0.2 mm, light brown or gray, surface rugose to papillose;

coma usually readily detached, white, 3–9 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.