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southern flax

Laredo flax

Habit Herbs, annual, 10–50 cm, puberulent near base, otherwise glabrous. Herbs, perennial (sometimes flowering in 1st year), 15–30 cm, glabrous.
Stems

stiffly ascending-spreading, few to many-branched.

erect to ascending, branches diffuse.

Leaves

alternate, appressed;

stipular glands present at basal nodes or throughout;

blade linear, 7–20 × 0.5–l.9 mm, margins entire, not ciliate, apex aristate.

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

racemes.

panicles.

Pedicels

3–15 mm.

10 mm.

Flowers

sepals deciduous, lanceolate to narrowly ovate, 4–7 mm, margins scarious, delicately glandular-toothed, apex aristate;

petals yellow to yellow-orange throughout, oblanceolate to narrowly obovate, 5–10 mm;

stamens (3–)4–7 mm;

anthers 0.4–1 mm;

staminodia present or absent;

styles connate nearly to apex, 2–5.7 mm;

stigmas green, 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, 3.2–4.5 × 2.5–3.4 mm, relatively thick-walled and with characteristic thickened areas at apex in region of true septa, 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 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

2–3 × 0.8–1.3 mm.

3 × 1.2–1.3 mm.

2n

= 30.

Linum australe

Linum elongatum

Phenology Flowering Feb–May.
Habitat Often on hard-packed, often red, sandy soils.
Elevation 0–300 m. (0–1000 ft.)
Distribution
from FNA
AZ; CO; MT; NM; NV; TX; UT; WY; AB; Mexico
[WildflowerSearch map]
[BONAP county map]
from FNA
TX; Mexico (Nuevo León, Tamaulipas)
[BONAP county map]
Discussion

Varieties 2 (2 in the flora).

The stems of Linum australe are strongly ridged-sulcate to ribbed, especially distally. The corollas are broadly funnelform; petals are yellow to yellow-orange; stamens and styles are yellow; stigmas are bright to olive green. Staminodia in L. australe are short, deltoid, usually two between each pair of stamens, sometimes one or absent. Linum australe is the only species in its range that is glabrous beyond the base and has connate styles. It differs from L. aristatum, which it overlaps in the southern part of the range, in being much more highly branched and having more slender capsules. C. M. Rogers (1984) noted a compact form found in sunny areas from Wyoming northward that warrants more study.

(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.)

Key
1. Stipular glands present only at proximal nodes; stamens (3–)4–5 mm; styles (2–)2.7–3.3(–4) mm.
var. australe
1. Stipular glands present at nodes throughout plant; stamens 5–7 mm; styles 3.6–5.7 mm.
var. glandulosum
Source FNA vol. 12, p. 390. 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. 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. rupestre, 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
Subordinate taxa
L. australe var. australe, L. australe var. glandulosum
Synonyms Cathartolinum elongatum
Name authority A. Heller: Bull. Torrey Bot. Club 25: 627. (1898) (Small) H. J. P. Winkler: in H. G. A. Engler et al., Nat. Pflanzenfam. ed. 2, 19a: 116. (1931)
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