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, terete, 15–200 cm, simple to paniculate-branched (especially in larger plants), glabrous proximally, strigillose distally, sometimes mixed glandular puberulent.

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.

subsessile or petiole 1–4 mm, blade linear to linear-lanceolate or narrowly elliptical, often folded along midrib, 1–5.5(–7) × 0.1–0.8 cm, usually shorter than internodes, base tapered or cuneate, margins remotely denticulate, 2–10 teeth per side, lateral veins obscure, 2–5 per side, apex acute or acuminate, surfaces subglabrous and sometimes glaucous to strigillose;

bracts very reduced, sometimes attached to pedicel.

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

erect, open panicles with filiform branches or simple racemes, glabrous or 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.

usually erect;

buds 1–12 × 1–3.5 mm;

floral tube obconic to funnel-form, 1–16 × 0.8–2.9 mm, with ring of spreading hairs near mouth inside, in larger flowers, ring swollen;

sepals green to reddish green, 1–8.5 × 0.8–2.1 mm, apex acute, abaxial surface strigillose and glandular puberulent to subglabrous;

petals white to pink or deep rose-purple, 1.5–15(–20) × 1–7.5 mm, apical notch 0.5–6.5 mm;

filaments usually cream-white, rarely pink, those of longer stamens 1–9.5 mm, those of shorter ones 0.5–6.3 mm;

anthers cream, 0.5–4 × 0.3–2 mm;

ovary 2–16 mm, strigillose, often mixed glandular puberulent, to subglabrous;

style cream, 2–18 mm, stigma clavate to subcapitate, entire to deeply 4-lobed, 0.5–1.9 × 0.3–2.5 mm, surrounded by stamens or (in some larger flowers) exserted beyond anthers.

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

erect or ascending, 15–32 mm, surfaces strigillose and glandular puberulent or glabrous;

pedicel 1–17 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 to broadly obovoid, with constriction 0.3–0.7 mm from micropylar end, 1.5–2.7 × 0.8–1.3 mm, chalazal collar inconspicuous, brown or gray, often flecked with darker spots, surface low papillose;

coma easily detached, white to dingy white, 5–10 mm.

= 36.

= 24.