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.

terete, 1.5–32 cm, simple or often with sprawling, stout, prostrate proximal branches, proximally glabrous, often distally spreading-hairy and ± 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, blade grayish green, linear to narrowly elliptic, proximally broader and surfaces subglabrous, distally narrower and surfaces densely villous, especially on margins and midrib, often folded along midrib, usually early-withering, 1.5–5.5 × 0.2–0.6 cm, base cuneate, margins serrulate, 5–18 low teeth per side, lateral veins obscure, 1–4 per side, apex acute;

bracts scarcely reduced.

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

erect spikes, leafy, densely villous and glandular puberulent, first flowers at most proximal nodes.

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.

± cleistogamous, suberect, often hidden by subtending bracts;

buds 2–4 × 1–1.5 mm, apiculate;

floral tube 0.5–1 × 0.4–1 mm, raised ring of lax hairs near mouth inside;

sepals pale green or reddish green, not keeled, 1.5–3 × 0.6–1.2 mm, apex acute, abaxial surface villous and glandular puberulent;

petals white to pale pink, 2–5.8 × 0.8–1.8 mm, apical notch 0.5–1.5 mm;

filaments light pink, those of longer stamens 0.6–1.6 mm, those of shorter ones 0.5–0.8 mm;

anthers light yellow, 0.4–0.5 × 0.3–0.5 mm;

ovary 8–11 mm, densely villous and glandular puberulent;

style light pink, 1.4–2.4 mm, stigma capitate, ± 4-lobed to subentire, 0.5–0.9 × 0.4–0.8 mm, surrounded by longer anthers.

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

pedicel 10–35 mm.

narrowly cylindrical, often curved-ascending, sharply 4-angled with 4 strong ribs, 8–12 mm, beak 1.5–3 mm, tardily dehiscent on distal 1/3, central axis disintegrating, sparsely villous and glandular puberulent;

sessile.

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.

10–14 per tightly packed row, irregularly angular to fusiform, 1.2–1.5 ×0.4–0.6 mm, chalazal collar absent, surface irregularly reticulate.

= 36.

= 30.