Flora of North America species comparison

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

erect, unbranched or branched, 5–20 cm, glabrous.

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.

petiole absent;

blade obovate, linear-oblong, or spatulate, 2–20 × 2–10 mm, base cuneate or attenuate, margins entire, apex acute, obtuse, emarginate, or mucronate, surfaces glabrous;

venation usually inconspicuous, sometimes 3-nerved from base, midvein prominent.

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.

cupulate, 0.5–1.2 × 0.6–1.3 mm, glabrous;

glands 4, elliptic to orbiculate, 0.2–0.3 × 0.3–0.8 mm;

horns usually absent, occasionally divergent, 0.5–1.2 mm.

3–5.

6–10.

ovary glabrous;

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

ovary pilose only at base, styles 0.9–1.1 mm, 2-fid.

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

columella 1–1.3 mm.

subovoid, 2–3 × 1.8–3 mm, slightly lobed;

cocci rounded, smooth, glabrous or slightly pilose along abaxial region;

columella 1.1–1.8 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.

grayish, whitish, or light brownish, ovoid, 1.2–1.8 × 0.7–1.1 mm, transversally sulcate;

caruncle subglobose to subconic, 0.2–0.5 × 0.2–0.5 mm.

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

peduncle 0.2–0.5 mm.

peduncle 0–2 mm.

arrangement: terminal pleiochasial branches 2–5, each 2–6 times 2-branched;

pleiochasial bracts similar in shape to but usually shorter and wider than distal leaves;

dichasial bracts distinct, widely ovate, rhombic, or suborbiculate, imbricate, base cordate, truncate or cuneate, margins finely denticulate, apex acute or obtuse, strongly mucronate;

axillary cymose branches 0–10.