Flora of North America species comparison

erect, 3–10(–15) cm, glabrous.

erect, 1–15(–20) cm, scabrid-puberulent.

basal leaves persistent;

cauline leaves in 6–10 pairs, closely overlapping, not reduced;

basal blades arcuate-spreading, needlelike, (0.6–)1–2 cm × ca. 1 mm, ± rigid, herbaceous, apex spinose, glabrous, not glaucous.

basal leaves persistent;

cauline leaves in 1–4 pairs, usually little overlapping, often larger than basal leaves;

basal blades straight to arcuate-spreading, subulate to needlelike, 0.3–4 cm × 0.5–1.5 mm, flexible or rigid, herbaceous, apex spinose, glabrous, often glaucous.

3–45+-flowered, usually congested, subcapitate cymes.

3–30+-flowered, congested, capitate or subcapitate cymes.

ca. 0.1–3(–4) mm, glabrous.

0.2–2 mm, scabrid-puberulent.

sepals 1–3-veined, linear-lanceolate, (5–)8.5–12 mm, not enlarging in fruit, margins narrow, apex acuminate, glabrous;

petals white, oblong-lanceolate to narrowly spatulate, 7–9 mm, 0.8–1.1 times as long as sepals, apex rounded to blunt;

nectaries not apparent.

sepals 1–3-veined, often obscurely so, linear-lanceolate to lanceolate, (5–)6–10 mm, not enlarging in fruit, margins narrow, apex narrowly acute or acuminate, glabrous or pubescent;

petals white, oblanceolate, 4.5–8.5 mm, ± equaling sepals, apex rounded to obtuse;

nectaries as lateral and abaxial mounds with transverse groove at base of filaments opposite sepals, 0.2–0.3 mm.

2.3–3.3 mm, glabrous.

to 4 mm, glabrous.

black, pyriform, 1.2–1.7 mm, tuberculate.

black, ellipsoid-oblong to pyriform with hilar notch, 1.8–2 mm, tuberculate;

tubercles rounded, elongate.