LINACEAE 663 



5. Linum medium ( Planch. ) Britton. Perennial or sometimes annual, bright green, 

 glabrous. Stems 3-6 dm. tall, often tufted, strict, rigid, corymbosely branched above, 

 the branches stiff, erect-ascending : leaves firm, appressed or strongly ascending ; blades 

 0.6-2 cm. long, the lower ones often opposite, spatulate, the rest linear-elliptic or linear- 

 lanceolate, acute, sessile : pedicels mostly shorter than the sepals or the lower ones some- 

 times longer : outer sepals oblong to lanceolate, 2-4 mm. long, acuminate, entire ; inner 

 sepals shorter and broader than the outer, glandular-toothed, especially above the middle, 

 abruptly pointed : corolla light yellow: capsules depressed-globose, 2-3 mm. broad, shorter 

 than the persistent sepals. 



In dry soil, Ontario to Florida and Texas. Summer. 



6. Linum Floridknum (Planch. ) Trelease. Perennial, glabrous, bright green. Stems 

 3-8 dm. tall, strict, rigid, branching above or near the top : leaves firm, nearly erect or 

 appressed ; blades acute, 0.8-1.8 cm. long, the lower ones usually opposite, oblanceolate to 

 linear-lanceolate, the upper ones linear or linear-elliptic : outer sepals lanceolate or oblong- 

 lanceolate, 3-4 mm. long, entire, acuminate ; inner sepals shorter and narrower than the 

 outer, glandular-toothed : corolla yellow, 12-15 mm. broad : capsules ovoid or sometimes 

 broadly so, about 3 cm. long, longer than the sepals, about as long as the pedicels or 

 longer. 



In sandy soil, South Carolina to Florida and Louisiana. Summer. 



7. Linum rup6stre Engelm. Perennial. Stems tufted, often densely so, 2-7 dm. 

 tall, grooved or angled, sparingly branched above, the branches ascending, corymbose : 

 leaves firm, few, scattered ; blades linear-subulate, 3-10 mm. long, acute : pedicels shorter 

 than the sepals or the lower ones rarely longer : outer sepals lanceolate to elliptic, 3 mm. 

 long, mostly acuminate, glandular-toothed ; inner sepals elliptic or ovate, about 0.5 mm. 

 shorter than the outer, more finely glandular-toothed and abruptly pointed : corolla 

 yellow : capsule spheroidal-ovoid, broader than long, about 2 mm. broad, longer than the 

 sepals. 



On plains and prairies, Texas and adjacent Mexico. Spring and summer. 



8. Linum Harper! Small. Annual. Stems 3-8 dm. tall, nearly simple or sparingly 

 branched, corymbose above or virgate : leaves mainly alternate, erect or nearly so ; blades 

 narrowly linear, 0.5-2 cm. long, slender-tipped, sessile, glabrous, the marginal nerves in- 

 conspicuous : stipular glands black : pedicels mainly shorter than the sepals : outer sepals lan- 

 ceolate, 3.5-4 mm. long, acuminate, sparingly glandular-toothed ; inner sepals somewhat 

 shorter than the outer, acuminate, more copiously toothed : corolla pale yellow, 12-15 mm. 

 broad : capsules ovoid, 2.5-3 mm. long, obtuse, about as long as the sepals. 



In dry pine lands, Georgia. Summer. 



9. Linum sulcatum Ridd. Annual. Stems 2-7 dm. tall, simple or corymbosely 

 branched, sharply angled or winged, at least above : leaves firm, alternate, erect or ascend- 

 ing ; blades linear or linear-lanceolate, 0.8-2.5 cm. long, acute or acuminate, 3-nerved (the 

 marginal nerves prominent), sessile, glabrous : stipular glands black : pedicels shorter than 

 the sepals : outer sepals lanceolate, 5-6 mm. long, long-acuminate, glandular-toothed ; in- 

 ner sepals shaped like the outer, slightly shorter, more finely toothed : corolla light yel- 

 low, 10-13 mm. broad : capsules ovoid, about 3 mm. long, acute, surpassed by the sepals, 

 incompletely 10-celled, the septa ciliate. 



In dry soil, Ontario to Manitoba, Georgia and Texas. Summer. 



10. Lioum marginatum Small. Annual, smooth and glabrous. Stems simple or 

 branched at the base, 1-1.5 dm. tall : leaf-blades linear and linear-lanceolate, 1-2 cm. long, 

 acuminate, more or less involute : corymbs us'ually few-flowered : bracts linear-lanceolate : 

 outer sepals oblong-ovate, 5-6 mm. long, acute or slightly acuminate, with a broad coarsely 

 glandular-toothed margin ; inner sepals slightly broader and shorter than the outer, and 

 with more and rather smaller teeth : corolla yellow^ about 2 cm. broad : capsules broadly 

 ovoid, about 4 mm. high. 



In dry soil, Texas. Spring to fall. 



11. Linum rfgidum Pursh. Annual or perhaps perennial, glabrous or puberulent, 

 glaucous. Stems 1-5 dm. tall, simple below, corymbosely bra'nched and angled above, the 

 branches rigid : leaves firm ; blades linear or linear-lanceolate, erect or appressed, 0.6- 

 2.5 cm. long, acute or acuminate, sessile, the upper ones glandular-ciliate : pedicels longer 

 or shorter than the sepals : outer sepals lanceolate, 5-7 mm. long, long-acuminate, rather 

 finely glandular-serrate ; inner sepals nearly like the outer, sometimes slightly broader and 

 shorter, similarly toothed : corolla yellow, 1.5-3.5 cm. broad : capsules ovoid, 4-5 mm. 

 long, shorter than the sepals. 



In dry soil on prairies, Manitoba to Texas, Arizona and Mexico. Summer. 



