Flora of North America species comparison

repent, decumbent, or ascending to erect, leafy or leafless, (1.2–)2–30 cm (often as short as 2 cm in C. wrightii), glabrous or sparsely to densely villous.

repent, decumbent, or ascending, branching in distal 1/4–1/2, 4–30 cm, glabrous.

cauline or arising from stolons or rhizomes, opposite or alternate;

stipules absent;

petiole present, glabrous or villous;

blade ovate, depressed-ovate, depressed-elliptic, reniform, flabellate, or, sometimes, nearly orbiculate, unlobed, base attenuate, cuneate, truncate, or cordate, ultimate margins subentire, crenate, crenulate, or crenate-dentate, crenae sometimes prominent and margins appearing ± lobed, apex obtuse, rounded, or truncate, surfaces glabrous or sparsely villous to villous;

venation palmate.

opposite, sometimes alternate distally, membranous.

4–9;

petiole absent or 0.1–4 mm, glabrous;

blade ovate to depressed-ovate, round, or flabellate, 2.5–15 × 2–10(–20) mm, base attenuate to cordate, margins 5–7(–9)-crenate or -crenulate, glabrous, surfaces glabrous abaxially and adaxially.

simple or compound cymes, from terminal bud in rosette, 2–30-flowered, sometimes flowers solitary, bracteate.

terminal or axillary solitary flowers or 2–10-flowered, open cymes;

bracts green, not purple-spotted, foliaceous, ovate to flabellate, 2–7 × 2–7 mm, margins subentire or 5–7-crenate or -crenulate.

absent or 0.1–0.8 mm.

hypanthium 1/2–3/4 adnate medially or distally to ovary, 0.5–1.5 mm free from ovary, greenish or yellow-green;

sepals 4, yellow, greenish yellow, green, greenish red, reddish orange, or purple, sometimes purple-spotted;

petals absent;

nectary disc conspicuous or apparently absent;

stamens 2–8, usually 4 or 8;

filaments lanceolate to narrowly oblong;

ovary 1/2–3/4-inferior, 1-locular, carpels connate 3/4–4/5 their lengths;

placentation parietal;

styles 2;

stigmas 2.

hypanthium green, not purple-spotted, turbinate, 0.9–1.8 × 1.4–2.6 mm, glabrous;

sepals spreading to erect, green, greenish yellow, or greenish red, not purple-spotted or purplish brown-spotted distally, broadly triangular or broadly ovate to nearly round, 1.3–1.8 × 0.9–1.6 mm, apex obtuse to rounded;

nectary disc conspicuous, green or purple, 8-lobed;

stamens 4–8, 0.5–0.9 mm;

anthers purple, red, or orange, 0.2–0.3 × 0.4–0.5 mm;

styles 0.2–0.6 mm.

(cuplike after dehiscence), 2-beaked (beaks divergent).

dark brown or reddish brown, ellipsoid, ovoid, or spheroid, smooth.

6–16, dark brown, spheroid to ovoid, (0.5–)0.6–0.8 mm, puberulent.

leaves: petiole 1–4 mm, glabrous;

blade ovate to depressed-ovate, round, or flabellate, 2.5–15 × 2–10(–20) mm, base attenuate to cordate, margins subentire or 5–7(–9)-crenate or -crenulate, not purple-spotted, glabrous, surfaces glabrous abaxially and adaxially.

= 11.

= 18, 24.