The green links below add additional plants to the comparison table. Blue links lead to other Web sites.
enable glossary links

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
from FNA
NM; TX; Mexico (Chihuahua, Coahuila, Durango, Nuevo León); Central America (Guatemala)
[WildflowerSearch map]
[BONAP county map]
from FNA
TX; Mexico (Nuevo León, Tamaulipas)
[BONAP county map]
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
L. alatum, L. allredii, L. arenicola, L. aristatum, L. australe, L. berlandieri, L. bienne, L. carteri, L. catharticum, L. compactum, L. elongatum, L. floridanum, L. grandiflorum, L. harperi, L. hudsonioides, L. imbricatum, L. intercursum, L. kingii, L. lewisii, L. lundellii, L. macrocarpum, L. medium, L. neomexicanum, L. perenne, L. pratense, L. puberulum, L. rigidum, L. schiedeanum, L. striatum, L. subteres, L. sulcatum, L. trigynum, L. usitatissimum, L. vernale, L. virginianum, L. westii
L. alatum, L. allredii, L. arenicola, L. aristatum, L. australe, L. berlandieri, L. bienne, L. carteri, L. catharticum, L. compactum, L. floridanum, L. grandiflorum, L. harperi, L. hudsonioides, L. imbricatum, L. intercursum, L. kingii, L. lewisii, L. lundellii, L. macrocarpum, L. medium, L. neomexicanum, L. perenne, L. pratense, L. puberulum, L. rigidum, L. rupestre, L. schiedeanum, L. striatum, L. subteres, L. sulcatum, L. trigynum, L. usitatissimum, L. vernale, L. virginianum, L. westii
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)
Web links