Flora of North America species comparison

usually prostrate, occasionally with ascending tips, often mat-forming, not rooting at nodes, 5–45 cm, densely and evenly short-sericeous to sericeous or villous.

erect, branched, 20–60 cm, glabrous.

opposite;

stipules distinct, linear-subulate, sometimes irregularly 2–3-lobed, 1–1.3 mm, sparsely short-sericeous to sericeous or villous;

petiole 0.5–1.5 mm, moderately short-sericeous to sericeous or villous;

blade oblong-ovate to ovate-elliptic or oblong-elliptic, 4–18 × 2.5–8 mm, base strongly asymmetric, one side usually angled and other ± truncate and expanded into small, rounded auricle, margins serrulate (longer side) or subentire (shorter side), apex rounded or broadly acute, abaxial surface pale grayish green, moderately to densely lanulose to villous, adaxial surface usually with irregular reddish streak along midvein, glabrate or with sparse, long, slender hairs; palmately veined at base, pinnate distally.

petiole 0–1 mm;

blade oblong-spatulate, 20–50 × 7–18 mm, base broadly attenuate, margins serrulate, apex rounded to obtuse, surfaces glabrous, ± glaucous;

venation pinnate, midvein prominent.

obconic, 0.8–1 × 0.6–0.8 mm, sparsely strigose to short-sericeous;

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

appendages white to reddish tinged, lunate to oblong, 0.1–0.3 × 0.2–1.5 mm, distal margin crenulate.

narrowly campanulate, 0.8–1.1 × 1.1–1.3 mm, glabrous;

glands 4, elliptic, 0.3–0.5 × 0.5–0.7 mm;

horns absent.

2–5.

5–10.

ovary sericeous;

styles 0.3–0.4 mm, 2-fid at apex.

ovary glabrous;

styles 0.5–0.9 mm, 2-fid.

ovoid, well exserted from involucre at maturity, 1.3–1.5 × 1.2–1.4 mm, sparsely to moderately and evenly sericeous;

columella 1–1.2 mm.

depressed-globose, 2–3 × 2.5–3.5 mm, 3-lobed;

cocci rounded, papillate, papillae 0.2–0.5 mm, glabrous;

columella 1.5–1.9 mm.

white to light brown, oblong-ovoid, sharply angular in cross section, 1–1.2 × 0.6–0.9 mm, with 3–4 low, transverse ridges that cross angles.

purple-black, ovoid, 1.6–2 × 1.3–1.7 mm, reticulate and areolate;

caruncle reniform, flat, 0.5 × 0.7 mm.

solitary or in small, cymose clusters at distal nodes or on congested, axillary branches;

peduncle 0.1–0.6 mm.

peduncle 0.5–1 mm.

arrangement: terminal pleiochasial branches 3, 2–3 times 2-branched;

pleiochasial bracts elliptic-oblanceolate to oblong, similar in size to distal leaves;

dichasial bracts distinct, broadly ovate to orbiculate/reniform, base obtuse, margins serrulate, apex obtuse to rounded and often mucronulate;

axillary cymose branches 6–20(–25).

= 28.