Flora of North America species comparison

erect, simple or sometimes branched distally, 1–10 dm, glabrous (rarely sparsely stipitate-glandular or pubescent near nodes);

rhizomes slender;

bulblets absent.

prostrate to ascending, simple or branched proximally, 1–3 dm, pubescent;

rhizomes very slender;

bulblets absent.

opposite or whorled near stem apex, dimorphic;

distal petioles absent or 0.1–0.7 cm, proximal 0.3–2(–3.5) cm, ciliate proximally, cilia 0.3–1.2(–2) mm;

distal blades narrowly elliptic to elliptic-lanceolate or linear-lanceolate, proximal blades broadly elliptic or lanceolate, distal 3–18 × 0.2–1.6 cm, proximal 2–5 × 0.6–1.8 cm, bases of distal leaves cuneate, decurrent, bases of proximal leaves rounded to obtuse or cuneate, decurrent, margins entire (rarely serrulate), plane, ciliolate proximally, apex rounded to acute or acuminate, surfaces not punctate, glabrous;

venation pinnate-arcuate.

opposite or sometimes alternate near apex of stem;

petiole 0.5–1.5 cm, pubescent;

blade orbiculate to ovate or deltate, 1.5–4 × 0.7–2 cm, base rounded to truncate, slightly decurrent, margins entire, plane, pubescent, apex acute to obtuse, surfaces punctate, sparsely pubescent;

venation pinnate-arcuate.

axillary, solitary flowers.

axillary in distal leaves, solitary flowers.

1–5 cm, glabrous to sparsely stipitate-glandular (rarely pubescent).

0.2–0.8 cm, pubescent.

sepals 5, calyx not streaked, 3.5–8(–10) mm, glabrous or stipitate-glandular, lobes narrowly lanceolate to ovate, margins thin;

petals 5, corolla yellow, sometimes with slightly reddish base, not streaked, rotate, 4–10 mm, lobes with margins slightly erose apically, apex apiculate or mucronate, sparsely stipitate-glandular adaxially;

filaments distinct or nearly so, shorter than corolla;

staminodes 0.7–1 mm.

sepals 5, calyx not streaked, 5–9 mm, pubescent, lobes narrowly lanceolate, margins thin;

petals 5, corolla yellow, not streaked, rotate, 5–9 mm, lobes with margins entire, apex acute to rounded, stipitate-glandular;

filaments connate, shorter than corolla;

staminodes absent.

2–5 mm, usually not punctate, glabrous or slightly stipitate-glandular distally.

2.5–3 mm, not punctate, pubescent distally.

= 34.

= 18, 20, 22 (all Asian).