Flora of North America species comparison

prostrate, mat-forming, 10–35(–50) cm, shortly pilose or puberulent at least proximally, often glabrous distally.

erect or ascending, usually unbranched, occasionally few branched, solitary or few, previous year's dead stems not persistent, 20–100 cm, glabrous or slightly pilose to villous.

opposite;

stipules distinct, divided into 5–7 subulate-filiform segments, 0.6–1.1 mm, usually glabrous, rarely pilose;

petiole 0.5–1 mm, glabrous;

blade ovate, elliptic-oblong, or slightly ovate-cordate, 3–11 × 2–5 mm, base asymmetric, truncate to hemicordate, margins serrulate at least toward apex, often entire toward base, apex acute to obtuse, surfaces sometimes with red spot in center, glabrous; usually only the midvein conspicuous.

alternate, ascending;

stipules 0.1–0.2 mm;

petiole minute or absent;

blade oblanceolate, obovate, or elliptic, 25–55 × 5–12 mm, base cuneate to rounded, margins entire, occasionally slightly revolute, apex rounded to subacute, abaxial surface glabrous or pilose to villous, adaxial surface usually glabrous, rarely villous;

venation occasionally obscure on small leaves, midvein conspicuous.

obconic, 0.5–0.6 × 0.4–0.5 mm, glabrous;

glands 4, yellowish to pink, circular to oblong, 0.1 × 0.1–0.2 mm;

appendages absent, or white to pink, semicircular to broadly ovate, to 0.1 × 0.2 mm, distal margin entire or shallowly lobed.

campanulate, 1.2–1.5 × 1.2–1.5(–2) mm, glabrous or moderately puberulent (especially near glands);

glands 5, green, reniform, 0.5 × 0.8–1 mm;

appendages white, flabellate, 2.5–3.5(–4.5) × 2.5–3.2 mm, entire.

3–5.

20–25.

ovary glabrous;

styles 0.1–0.3 mm, 2-fid nearly entire length.

ovary glabrous;

styles 0.8–1.4 mm, 2-fid at apex to 1/2 length.

ellipsoid to ovoid, 1.3–1.5 × 1.1–1.5 mm, glabrous;

columella 1–1.3 mm.

globose, 2.3–3 × 3.5–4.2 mm, glabrous;

columella 2–2.5 mm.

light gray to light brown, narrowly ovoid to ovoid, 4-angled in cross section, 1–1.2 × 0.6–0.7 mm, with 3–5 prominent transverse ridges that often interrupt abaxial keel.

white or light gray, ovoid, 2.5–2.8 × 2.2 mm, with shallow and coarse depressions;

caruncle absent.

solitary at distal nodes of primary stems or at nodes of short congested axillary branchlets;

peduncle 0.2–0.5 mm.

in terminal pleiochasia, dichasial bracts occasionally whorled or rarely alternate;

peduncle (1.5–)5–11(–13) mm (proximal to 70 mm), glabrous.