Flora of North America species comparison

erect, branched, 40–90 cm, glabrous.

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.

petiole 0.5–1 mm;

blade elliptic to oblong, 8–20(–40) × 3–6 mm, base truncate, rounded, or attenuate, margins entire, apex obtuse or acute, sometimes slightly mucronate, surfaces glabrous;

venation inconspicuous, only midvein prominent.

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.

turbinate or campanulate, 1.5–2.5 × 1.1–1.9 mm, glabrous;

glands 4, crescent-shaped to semicircular, 0.5–0.8 × 1–1.8 mm;

horns usually convergent, 0.2–0.8 mm.

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.

8–12.

2–5.

ovary glabrous;

styles 1–1.8 mm, 2-fid.

ovary sericeous;

styles 0.3–0.4 mm, 2-fid at apex.

depressed-ovoid, 4.3–5 × 5–6 mm, 3-lobed;

cocci rounded, smooth, glabrous;

columella 3.5–4 mm.

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.

gray to dark brown, ovoid-oblong, truncate at both ends, 2.6–3.4 × 2–2.6 mm, shallowly pitted to almost smooth;

caruncle conic, 1 × 0.8 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.

arrangement: terminal pleiochasial branches 3–5(–6), each 3–4 times 2-branched;

pleiochasial bracts ovate-lanceolate to slightly subpandurate, similar in size or wider than distal leaves;

dichasial bracts distinct, lanceolate to broadly ovate, base usually truncate to rounded or subcordate, sometimes attenuate, margins entire or slightly crenulate, apex usually obtuse to acute, occasionally acuminate;

axillary cymose branches 2–8.

peduncle 1–3 mm.

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

peduncle 0.1–0.6 mm.

= 26.

= 28.