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.

erect, simple or branched, 1–12(–25) dm, pubescent and sometimes obscurely stipitate-glandular distally;

rhizomes thickened;

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.

whorled, opposite, or subopposite;

petiole 0.1–0.6 cm, eciliate;

blade lanceolate to lanceolate-ovate, 7–12 × 1.5–4 cm, base truncate, obtuse, or cuneate, sometimes slightly decurrent, margins entire or sometimes sinuate, slightly revolute or plane, eciliolate, apex acute to acuminate, surfaces obscurely punctate apically or along margins, pubescent abaxially and sometimes sparsely stipitate-glandular adaxially;

venation pinnate to reticulate.

axillary, solitary flowers.

terminal or terminal and axillary in distal leaves, panicles, 2–8 cm.

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

2–7 mm, pubescent and sometimes also stipitate-glandular.

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 streaked with longitudinal maroon resin canals along margins, 2.5–5 mm, pubescent and stipitate-glandular near margins, lobes ovate, margins thin or slightly thickened;

petals 5, corolla yellow, sometimes with reddish base, not streaked, rotate, 8–12 mm, lobes with margins entire, apex acute to rounded, stipitate-glandular adaxially;

filaments connate 1.5–2.2 mm, shorter than corolla;

staminodes absent.

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

(somewhat reddened distally), 3.5–6 mm, not punctate, glabrous.

= 34.

= 28, 42, 56, 84 (Europe).