Flora of North America species comparison

erect, 3–10(–15) cm, glabrous.

erect, (8–)10–25 cm, glabrous or stipitate-glandular.

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 usually in 2–4 pairs, reduced distally;

basal blades spreading to recurved, needlelike, 1–3(–3.5) cm × 0.5–0.7 mm, flexuous to rigid, herbaceous, apex spinose, glabrous to puberulent, not glaucous.

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

(1–)3–17-flowered, ± open cymes.

ca. 0.1–3(–4) mm, glabrous.

3–30 mm, glabrous or stipitate-glandular.

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 green or purplish, 1–3-veined, lanceolate to ovate-lanceolate, (3.5–)4–6.5 mm, not enlarging in fruit, margins broad, apex narrowly acute to acuminate, glabrous or stipitate-glandular;

petals yellowish white or sometimes brownish to reddish pink, broadly oblong-elliptic to oblanceolate, 4–6.5 mm, 0.9–1.1 times as long as sepals, apex rounded;

nectaries narrowly longitudinally rectangular, apically cleft or emarginate, adjacent to filaments opposite sepals, 1–2 mm.

2.3–3.3 mm, glabrous.

4–6 mm, glabrous.

black, pyriform, 1.2–1.7 mm, tuberculate.

brown, ovoid to suborbicular with hilar notch, 1.2–1.7 mm, papillate, subechinate;

tubercles conical.