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.

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

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

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

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

12–20 mm, surfaces sparsely hairy;

pedicel 2–5 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 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.