Flora of North America species comparison

erect, simple to loosely clustered, terete, 15–95 cm, simple to well branched, densely strigillose, often mixed glandular puberulent on inflorescence, rarely with faint 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 proximally, usually alternate, rarely fasciculate distally, subsessile;

blade linear to very narrowly elliptic or sublanceolate, 2–7.5 × 0.1–0.7 cm, usually longer than internodes, base rounded to subcuneate, margins subentire, 4–7 inconspicuous teeth per side, sometimes revolute, lateral veins inconspicuous, apex obtuse proximally to acute distally, both surfaces densely strigillose, increasing distally;

bracts not 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 racemes, densely strigillose, often mixed sparsely glandular puberulent.

erect, open panicles with filiform branches or simple racemes, glabrous or strigillose, often mixed glandular puberulent.

erect;

buds 3–5 × 1.5–2.5 mm;

pedicel 5–12 mm;

floral tube 0.8–1.5 × 1.2–1.8 mm, ring of spreading hairs at mouth inside;

sepals 2.5–4.5 × 0.9–1.3 mm, abaxial surface strigillose;

petals obcordate, white to light pink, 3.5–7 × 1.6–4 mm, apical notch 1–1.8 mm;

filaments white or cream, those of longer stamens 0.8–3.5 mm, those of shorter ones 0.6–2.5 mm;

anthers cream, 0.5–0.9 × 0.4–0.6 mm;

ovary 12–18 mm, densely strigillose, sometimes mixed glandular puberulent;

style cream, 2–3.8 mm, stigma narrowly clavate, entire, 1–1.8 × 0.5–1.2 mm, usually surrounded by, rarely exserted beyond, 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.

straight, narrowly cylindrical, 35–80 mm, surfaces densely strigillose;

pedicel 10–35 mm.

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

pedicel 1–17 mm.

narrowly fusiform to narrowly obovoid, 1.5–2.2 ×0.5–0.7 mm, chalazal collar 0.1–0.2 mm, ± pronounced, surface papillose;

coma persistent, dingy white, 6–8 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.