Linum rupestre |
Linum elongatum |
|
---|---|---|
rock flax |
Laredo flax |
|
Habit | Herbs, perennial, 20–75 cm, glabrous or rarely sparsely hairy proximally. | Herbs, perennial (sometimes flowering in 1st year), 15–30 cm, glabrous. |
Stems | erect, branched at base and in inflorescence. |
erect to ascending, branches diffuse. |
Leaves | opposite near base or alternate throughout, appressed-ascending; stipular glands present; blade linear to linear-lanceolate, 8–20 × 0.5–2.1 mm, margins entire or with scattered minute marginal glands, not ciliate, apex acute; 1-nerved. |
alternate, ascending; stipular glands present throughout or at distal nodes only; blade linear, 5–25 × 0.5–1 mm, margins entire, sometimes glandular, not ciliate, apex acute. |
Inflorescences | panicles, with ascending to spreading branches. |
panicles. |
Pedicels | 0–3 mm. |
10 mm. |
Flowers | sepals persistent, lanceolate to ovate, 2.5–5 mm, margins of inner sepals narrowly scarious, conspicuously glandular-toothed, apex acute or acuminate; petals lemon yellow, oblanceolate or narrowly obcordate, 7–11 mm; stamens 2–8 mm; anthers 0.5–1 mm; staminodia present; styles distinct, 3–6.5 mm; stigmas capitate. |
sepals deciduous, mostly lanceolate, 6–11 mm, margins not scarious, all conspicuously glandular-toothed, apex attenuate; petals yellow-orange to salmon or brownish red, with prominent wine-colored band proximal to middle, broadly obovate, 14–18 mm; stamens 5–6 mm; anthers 1.5–2.5 mm; staminodia absent; styles connate nearly to apex, 7–9.5 mm; stigmas capitate. |
Capsules | ovoid, 2–3 × 2–2.5 mm, apex sharp-pointed, dehiscing readily into 10, 1-seeded segments, segments falling freely, false septa incomplete, false and true septa margins ciliate. |
ovoid, 4 × 3 mm, apex obtuse, dehiscing into 5, 2-seeded segments, segment persistence unknown, apex blunt or subacute, minutely apiculate, false septa complete, proximal part membranaceous, not terminating in loose fringe, distal part cartilaginous, margins not ciliate. |
Seeds | 1.2–1.9 × 0.7–1.1 mm. |
3 × 1.2–1.3 mm. |
2n | = 36. |
= 30. |
Linum rupestre |
Linum elongatum |
|
Phenology | Flowering Apr–Aug. | Flowering Feb–May. |
Habitat | Sandy soils, rocky slopes and ledges, often on limestone. | Often on hard-packed, often red, sandy soils. |
Elevation | 150–1500 m. (500–4900 ft.) | 0–300 m. (0–1000 ft.) |
Distribution |
NM; TX; Mexico (Chihuahua, Coahuila, Durango, Nuevo León); Central America (Guatemala)
|
TX; Mexico (Nuevo León, Tamaulipas) |
Discussion | Linum rupestre has narrowly funnelform corollas and yellow stamens and styles. The anthers and stigmas are held closely adjacent at the mouth of the corolla tube, below the broad, spreading limbs. The species occurs from southeastern New Mexico and central Texas to Guatemala. It often grows with L. schiedeanum in Texas and Mexico. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
The stems of Linum elongatum are ribbed. In the flora area, it occurs in southern Texas, especially along the Rio Grande, and in south central Texas. The yellow-orange to salmon or brownish red petals with the distinctive wine-colored band proximal to the middle, brick red anthers, and wine-colored stigmas make the flowers of L. elongatum striking. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 12, p. 381. | FNA vol. 12, p. 391. |
Parent taxa | Linaceae > Linum > sect. Linopsis | Linaceae > Linum > sect. Linopsis |
Sibling taxa | ||
Synonyms | Cathartolinum elongatum | |
Name authority | Engelmann ex A. Gray: Boston J. Nat. Hist. 6: 232. (1850) | (Small) H. J. P. Winkler: in H. G. A. Engler et al., Nat. Pflanzenfam. ed. 2, 19a: 116. (1931) |
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