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.

delicate, erect, loosely clumped, terete, 5–20 cm, simple or branched from base, densely glandular puberulent, without decurrent lines.

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.

opposite proximal to inflorescence, alternate distally, subsessile;

blade broadly obovate to orbiculate proximally to ovate or lanceolate distally, 0.4–2 × 0.3–1.2 cm, base cuneate to rounded, margins finely denticulate, 4–6 low teeth per side, veins indistinct, 2–6 per side, apex obtuse to subacute distally, surfaces subglabrous with strigillose margins and veins or both surfaces sparsely strigillose distally;

bracts much reduced and narrower.

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

erect, open racemes, 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.

sometimes cleistogamous;

buds 2–3.5x 1–1.5 mm, often nodding;

pedicel 8–16 mm;

floral tube 0.4–0.8 × 0.5–1 mm, ring of sparse hairs at mouth inside, or absent;

sepals 1.5–2 × 0.8–1 mm;

petals white, 2–3 × 1.5–2 mm, apical notch 0.4–0.5 mm;

filaments white, those of longer stamens 1.8–3 mm, those of shorter ones 1–1.5 mm;

anthers 0.3–0.4 ×0.3–0.4 mm;

ovary 9–12 mm, sparsely glandular puberulent;

style white, 2–3 mm, stigma white, narrowly clavate, entire, 0.5–0.6 × 0.4–0.5 mm, surrounded by anthers.

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

35–45 mm, surfaces subglabrous to sparsely glandular puberulent;

pedicel 25–40 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.

narrowly oblanceoloid, 0.8–1.1 × 0.3–0.4 mm, chalazal collar inconspicuous, surface low papillose;

coma easily detached, dingy white, 3–6 mm.

= 36.

= 36.