Linum compactum

A. Nelson

Bull. Torrey Bot. Club 31: 241. 1904.

Common names: Wyoming flax
Synonyms: Linum rigidum var. compactum (A. Nelson) C. M. Rogers
Treatment appears in FNA Volume 12. Treatment on page 390. Mentioned on page 379, 392.

Herbs, annual, 5–30 cm, glabrous throughout or puberulent at base. Stems erect, branched from base and throughout, bushy. Leaves alternate, spreading to ascending; stipular glands absent; blade linear, 10–28 × 1–1.5 mm, margins entire or sparsely toothed on distal leaves, not ciliate, apex acute. Inflorescences dense panicles. Pedicels 2–7 mm. Flowers: sepals tardily deciduous, lanceolate, 5–9 mm, margins narrowly scarious, conspicuously glandular-toothed, apex acute to acuminate; petals yellow, obovate, 6–11 mm; stamens 4–6 mm; anthers 0.4–0.8 mm; staminodia absent; styles connate nearly to apex, 2.5–4 mm; stigmas capitate. Capsules ovoid, 3.5–4.4 × 2.7–3.5 mm, apex obtuse, dehiscing into 5, 2-seeded segments, segments persistent on plant, false septa complete, proximal part membranaceous, not terminating in loose fringe, distal part cartilaginous, margins not or only minutely ciliate. Seeds 2.6–3.1 × 1–1.3 mm. 2n = 30.

Phenology: Flowering Jun–Aug(–Sep).
Habitat: Sagebrush grasslands, ponderosa pine woodlands, meadows, prairies, rocky outcrops.
Elevation: 600–1800 m.


V12 87-distribution-map.jpg

Alta., Sask., Colo., Ill., Kans., Mo., Mont., Nebr., N.Mex., N.Dak., Okla., S.Dak., Tex., Wyo.


Linum compactum is generally low-growing, much branched, and bushy; its flowers are smaller than those of L. rigidum. Linum compactum is found on the high plains in open areas. C. M. Rogers (1984) suggested that it might be closely related to L. australe, which differs in being more slender with more open habit and of pine forest habitats.

Selected References


Lower Taxa

... more about "Linum compactum"
Nancy R. Morin +
A. Nelson +
Linopsis +
Wyoming flax +
Alta. +, Sask. +, Colo. +, Ill. +, Kans. +, Mo. +, Mont. +, Nebr. +, N.Mex. +, N.Dak. +, Okla. +, S.Dak. +, Tex. +  and Wyo. +
600–1800 m. +
Sagebrush grasslands, ponderosa pine woodlands, meadows, prairies, rocky outcrops. +
Flowering Jun–Aug(–Sep). +
Bull. Torrey Bot. Club +
Linum rigidum var. compactum +
Linum compactum +
Linum sect. Linopsis +
species +