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.

strict, terete, 5–45 cm, simple to freely branched, subglabrous to strigillose proximally, strigillose and often villous and/or glandular puberulent distally.

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.

mostly alternate, often fasciculate distally, petiole 1–12 mm, blade spatulate proximally to narrowly lanceolate or linear distally, usually folded along midrib, 0.5–3 × 0.1–0.7 cm, base long-attenuate, margins subentire or scarcely serrulate, 2–4 remote teeth per side, lateral veins inconspicuous, apex blunt proximally to acute distally, surfaces subglabrous or with scattered short hairs on margins;

bracts much reduced, sometimes attached to pedicel.

erect racemes, densely strigillose, often mixed sparsely glandular puberulent.

suberect panicles or racemes, congested distally, with few thin branches, densely strigillose, often sparsely mixed villous and 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.

erect, often cleistogamous;

buds 1.1–1.9 × 0.8–1.1 mm,often apiculate;

floral tube 0.4–0.8 × 0.5–0.8 mm, with ring of short hairs at mouth inside;

sepals often reddish green, 1.3–2.5 × 0.5–0.7 mm, apex subacute;

petals white,1.4–2.5(–3) × 1–1.8 mm, apical notch 0.5–0.7 mm;

filaments white, those of longer stamens 0.9–1.3 mm, those of shorter ones 0.5–0.7 mm;

anthers 0.3–0.5 × 0.2–0.4 mm, apiculate;

ovary 4–6 mm, strigillose;

style white or cream, 1.2–1.7 mm, stigma subcapitate to obscurely 4-lobed, 0.3–0.4 × 0.4–0.6 mm, surrounded by longer anthers.

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

pedicel 10–35 mm.

12–20 mm, surfaces sparsely hairy;

pedicel 2–5 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, with slight constriction 0.2–0.3 mm from micropylar end, 0.6–0.9 × 0.3–0.5 mm, short chalazal collar 0.2–0.3 mm wide, grayish brown, surface low-papillose in ± irregular rows;

coma easily detached, dingy white, 2–2.5 mm.

= 36.

= 32.