Linum. LINAGES. 347 



L. sulcatum, Riddell. Annual, glabrous : stem subsimple below or with a few strict 

 branches at base, corymbosely branched near the top : leaves lanceolate, very acute, S-keeled 

 with the lateral nerves close to the margin, the lowest entire, about 10 lines long, the upper 

 much smaller and glandular-serrulate : flowers scattered on the rather short upper branches : 

 sepals lanceolate, very acute, keeled and with a pair of more or less prominent lateral 

 nerves, occasionally elongated and leaf-like : petals 6 lines long : styles variously united 

 below the middle : capsule ovoid, rather acute, a line and a half long, often conspicuously 

 shorter than the calyx. — Cat. PI. Ohio, Suppl. 10; Gray, Man. ed. 5, 105 ; Trelease, 1. c. 14. 

 L. Bootii, Planch. 1. c. vii. 475. — Connecticut to Manitoba, south to Virginia and Texas. 



-I— -H- Capsule medium-sized (2 to 3 lines long), 5-valved through the complete false septa, 

 the true septa with cartilaginous dorsal thickenings at base : styles united almost to the 

 top : stems mostly angled : upper leaves or bracts glandular-serrulate : petals bearded at 

 base : rather rigid often very corymbose frequently puberulent alternate-leaved Western 

 species. 



++ Sepals at length deciduous : leaves scattered except sometimes at base of shoots, the 

 broader spreading : stipular glands commonly present : capsule oblong-ovoid ; false septa 

 more or less thickened outwardly : small group of variable closely related species, with 

 flowers ranging from deep orange to nearly white. 



= Leaves narrow : capsule 2 lines long ; false septa thickened for a very small distance. 



L. aristatuna, Engelm. Much branched toward the base or throughout, the branches 

 slender, ascending, bluish, glabrous or puberulent : leaves erect, narrowly linear-lanceo- 

 late, 3 or 4 lines long, awn-pointed, 1-nerved : flowers few, solitary at the ends of the 

 branches or seemingly opposite the leaves, their pedicels long, grooved rather than wing- 

 angled : sepals lanceolate, gradually aristate, with prominent midrib and occasionally 2 

 lateral veins above : petals 6 to 8 lines long : capsule scarcely more than half as long as the 

 calyx; the false septa membranaceous except for a short distance from the outer margin. — 

 Engelm. in Wislizenus, Tour Northern Mex. 101 ; Gray, PI. Wright, i. 25, 26; Trelease, 

 1. c. 15. — Southern Utah through Arizona, New Mexico, and Western Texas. (Northern 

 Mex.) 



Var. subteres, Trelease. Blue-green, glabrous, of the lax habit of the type, though 

 more branched below, nearly without stipular glands : branches slightly angled : pedicels 

 sometimes greatly elongated (occasionally 2 inches long), not prominently winged : sepals 

 acute, 1-nerved, more persistent than usual in the group. — Proc. Calif. Acad. Sci. ser. 2, vi. 

 285. — Nevada, Sprucemont, Jones, and Utah, Bluff City, Wether ill, Willow Creek, Miss 

 Eastwood. 



L. rigidum, Pursh. Perennial?, glabrate or with the angles slightly roughened : stems 

 somewhat cespitose, corymbosely branched above, the branches rather rigid and, like the 

 pedicels, strongly wing-angled : leaves green to bluish, linear-lanceolate, obtuse or acute, 

 about 6 lines long, 1-nerved, the broader often with 2 lateral keels towards the apex : flow- 

 ers more or less numerous : sepals lanceolate, slender-pointed, short-awned, strongly 1-3- 

 wing-nerved : petals sometimes 8 lines long : capsule somewhat shorter than the calyx, the 

 false septa thickened for about a third their width. — Fl. i. 210; Torr. & Gray, Fl. i. 204, in 

 part; Planch. 1. c. vii. 474 ; Engelm. in Gray, PI. Wright, i. 25 ; Trelease, 1. c. 16. L. an- 

 nuitm, Nees, Verzeichn. Pfl. Maximilian von Wied, 5, & Bot. Zeit. ii. 547. — Brit. America to 

 Oregon and Iowa, south to Texas. Also collected at Miami, Florida, in 1877, by Garher. 



Var. puberulum, Engelm. Annual, blue-green, puberulent : stems mostly solitary 

 and low, corymbosely stout-branched above : leaves linear, acute, 3 or 4 lines long, 1 -nerved : 

 otherwise like the type. — Engelm. in Gray, PI. Wright, i. 25 ; Trelease, 1. c. Colorado to 

 Nevada, Southern California, and Texas. 



^ = Leaves usually broader, green : capsule 2\ lines long ; false septa thickened for 

 half their width. 



L. Berlandieri, Hook, {aa L. Berendieri). Perennial?, nearly glabrous, few-branched or 

 simple below and rather closely corymbose above : leaves clear green, lanceolate, acute, 

 mostly spreading, occasionally 3 lines wide and 15 lines long, more or less 3-ribbed : sepals 

 elongated, lanceolate, gradually very acute, short-awned, strongly 3- or even 5-ribbed : petals 



