LINACEAE 663 
5. Linum médium (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 Floridànum (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 
dy so, about 3 cm. long, longer than the sepals, about as long as the pedicels or 
onger. 
In sandy soil, South Carolina to Florida and Louisiana. Summer. 
7. Linum rupéstre 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 
Dr 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 Hárperi 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- 
conspieuous : 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 marginàtum 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 usually 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 rigidum Pursh. Annual or perhaps perennial, glabrous or puberulent, 
glaucous. Stems 1-5 dm. tall, simple below, corymbosely branched and angled above, the 
ranches 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 
nely glandular-serrate ; inner sepals nearly like the outer, sometimes slightly broader and 
shorter, similarly toothed : corolla yellow, 1.5-3.5 em. broad : capsules ovoid, 4-5 mm. 
long, shorter than the sepals. 
In dry soil on prairies, Manitoba to Texas, Arizona and Mexico. Summer. 
