Flora of North America species comparison

erect, 3–10(–15) cm, glabrous.

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.

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

tightly congested cymes.

ca. 0.1–3(–4) mm, glabrous.

0.1–1(–3) mm.

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 8.5–12 mm;

petals ca. 0.8–0.9 times as long as sepals.

2.3–3.3 mm, glabrous.

black, pyriform, 1.2–1.7 mm, tuberculate.