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, unbranched, 7–20 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 1–2 mm, reduced distally;

blade spatulate-cuneate, 8–10 × 4–5 mm (greatly reduced in size proximally), base cuneate, margins entire, apex rounded to emarginate or obcordate, surfaces glabrous;

venation pinnate.

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.

campanulate, 0.8–1.1 × 0.7–1 mm, glabrous;

glands 4, elliptic to trapezoidal, 0.3–0.6 × 0.6–1.2 mm;

horns divergent, 0.5–1 mm.

2–5.

10–15.

ovary sericeous;

styles 0.3–0.4 mm, 2-fid at apex.

ovary smooth, glabrous;

styles 0.6–1 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, 1.8–2.2 × 2.2–2.9 mm, slightly lobed;

cocci rounded to slightly flattened, smooth, glabrous;

columella 1.5–1.8 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.

reddish brown to brown, often glaucous, oblong, 1.3–1.4 × 0.8–0.9 mm, abaxial faces with 15–20 shallow pits or almost smooth, adaxial faces with 4–6 large shallow pits or irregular oblong grooves;

caruncle conic, hat-shaped, 0.3–0.4 × 0.4–0.6 mm.

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

peduncle 0.1–0.6 mm.

peduncle 0.2–0.6 mm.

arrangement: terminal pleiochasial branches 3, each 1–3(–4) times 2-branched;

pleiochasial bracts obovate, similar in size to distal leaves;

dichasial bracts distinct or basally subconnate, not imbricate, triangular-ovate, base truncate or cordate, margins entire, apex mucronate;

axillary cymose branches 1–4.

= 28.