Flora of North America species comparison

prostrate to ascending, usually mat-forming and rooting at nodes, 5–45 cm, sparsely to moderately villous to pilose (densely on young growth).

erect, unbranched or branched, 30–85(–150) cm, pilose or glabrous.

opposite;

stipules distinct, linear-subulate, often irregularly 2- or 3-lobed, 1–1.3 mm, sparsely villous to pilose;

petiole 0.5–1.5 mm, sparsely to moderately villous to pilose;

blade oblong-ovate to ovate-elliptic or oblong-elliptic, 4–18 × 2.5–8 mm, base strongly asymmetric, one side angled and other rounded to auriculate, margin on longer side serrulate, on shorter side subentire, apex rounded or broadly acute, abaxial surface pale grayish green, sparsely lanulose, adaxial surface usually with irregular reddish streak along midvein, usually glabrate, rarely sparsely lanulose; palmately veined at base, pinnate distally.

alternate;

stipules 0.1–0.3 mm;

petiole 0.2–3 mm, glabrous or minutely pilose;

blade broadly ovate to elliptic, 32–62(–82) × 18–28(–52) mm, base rounded to cuneate, margins entire, often white on distal leaves, apex acute, rarely mucronate, surfaces glabrous;

venation obscure, only midvein conspicuous.

obconic, 0.8–1 × 0.6–0.8 mm, sparsely villous to pilose;

glands 4, green to yellow-green (turning pink with age), usually ± unequal, narrowly oblong, 0.1–0.2 × 0.2–0.5 mm;

appendages white to reddish tinged, lunate, ± irregular and variable in shape, 0.1–0.3 × 0.2–1.5 mm, distal margin crenulate.

campanulate, 2.2–3.5 × 1.3–2.3 mm, margin between glands deeply divided into fringe of fimbriate lobes, pilose;

glands 4–5, green to greenish yellow, reniform to subcircular, 0.7–1.1 × 1–1.6 mm;

appendages white, orbiculate, 1.5–2.7 × 1.9–2.9(–3.6) mm, entire.

2–5.

30–70.

ovary short-sericeous;

styles 0.5–0.8 mm, 2-fid 1/2 length.

ovary pilose;

styles 1–2.5 mm, 2-fid 1/2–2/3 length.

ovoid, well exserted from involucre at maturity, 1.3–1.5 × 1.2–1.6 mm, sparsely to moderately short-sericeous;

columella 0.9–1.2 mm.

oblate, 3–5 × 3.5–7.5 mm, moderately to densely pilose;

columella 3–4.1 mm.

white to light brown, oblong-ovoid, bluntly angular in cross section, 0.8–1.2 × 0.5–0.9 mm, smooth or papillate.

orange-tan to gray, ovoid, 3.7–3.9 × 3–3.3 mm, rugose, with 2 transverse ridges (one dark orange to brown, other inconspicuous);

caruncle absent.

solitary at distal nodes;

peduncle 0.1–0.6(–2) mm.

in terminal pleiochasia, dichasial bracts narrowly elliptic to oblanceolate with conspicuous white margins;

peduncle 1.8–2.7(–22) mm, densely pilose.

= 56.