Part 1, 1907] LINACEAE VI 



VII. RlGIDA. 



Outer sepals copiously glandular-toothed, but sometimes less so than the 

 inner ; staminodia wanting or entire. 

 Stem, branches, and pedicels densely puberuleut. 35. C. puberulum. 



Stem, branches, and pedicels not densely puberulent, usually glabrous. 



Leayes numerous and imbricate on the lower part of the stem. 36. C. vernale. 

 Leaves neither numerous nor imbricate on the lower part of the 

 stem. 

 Inner sepals with relatively coarse and prominently gland-tipped 

 teeth ; upper leaves and bracts lax or spreading. 

 Ovary and filaments glabrous. 



Inner sepals with wide and very coarsely toothed margins. 37. C. alalum. 

 Inner sepals with narrower finely toothed margins. 

 Petals 5-9 mm. long. 



Outer sepals with faint lateral ribs near the base ; 



branches blunt-angled. 38. C. australe. 



Outer sepals with prominent lateral ribs throughout ; 

 branches wing-angled. 39. C. compaction . 



Petals 10-22 mm. long. 



Inner and outer sepals slightly unequal ; leaf-blades 

 narrowly linear to subulate, 1-ribbed or indis- 

 tinctly 3-ribbed. 

 Outer sepals with indistinct lateral ribs near the 

 base. 

 Outer sepals lanceolate, 6-7 mm. long, slightly 



narrower than the inner ones. 40. C. Carieri. 



Outer sepals linear-subulate, 11-14 mm. long, 

 much narrower than the inner ones. 41. C. clongatum. 



Outer sepals with prominent lateral ribs. 



False septa of the capsule slightly thickened. 42. C. rigidum. 

 False septa of the capsule thickened for about 



one half their width. 43. C. Bcrlandieri. 



Inner sepals much shorter than the outer ; leaf- 

 blades spatulate to narrowly oblong, prominently 

 3-ribbed. 44. C. sanctum. 



Ovary and filaments pubescent. 45. C. Earlei. 



Inner sepals with very numerous fine inconspicuously gland- 

 tipped teeth. 46. C. aristatum. 

 Outer sepals entire or with few scattered teeth ; staminodia 2-lobed. 47. C. subteres. 



VIII. Multicaulia. 

 One species. 48. C\ muliicaule. 



1. Cathartolinum striatum (Walt.) Small. 



I. mum striatum Walt. Fl. Car. 117. 1788. 



Linum virginianum diffusion Wood, Class Book. ed. 2. 195. 1848. 



Linton virginianum opposiiifolium Engelm. in A. Gray, PI. Wright. 1 : 26. 1852. 



Union diffusion Wood, Bot. & Fl. 66. 1870. 



Perennial, glabrous, bright-green, the stems solitary or several from the persistent 

 base, erect or decumbent, 2-11 dm. tall, paniculately branched, typically with many short 

 spreading or ascending branches arising from the upper leaf-axils, winged below the nodes 

 and angled ; leaves opposite below the inflorescence or sometimes all alternate, spreading 

 or ascending, the blades thinuish, oblong to elliptic, or sometimes oblong-spatulate near 

 the base of the stem, 1-3 cm. long, entire, acute, or those of the lower leaves obtuse, 

 slightly paler beneath than above ; bracts entire ; outer sepals lanceolate to oblong-lanceo- 

 late, 2-2.5 mm. long at maturity, acuminate, entire ; inner sepals shorter and broader than 

 the outer ones, entire, or erose near the abruptly pointed apex by the bases of the few- 

 deciduous marginal glands; petals yellow; capsules depressed-globose, about 2 mm. broad. 



Type locality : Carolina. 



Distribution : Ontario to Florida and Texas. 



Illustration : Britt. & Brown, 111. Fl. f. 2263. 



2. Cathartolinum virginianum (L.) Reichenb. Handb. 307. 1837. 



Linum virginianum h. Sp. PI. 279. 1753. 



Perennial, glabrous, often deep-green, the stems solitary or sometimes several together 

 from the persistent base, usually erect, 2-7 dm. tall, corymbosely branched near the top, 

 typically with few relatively long lax and somewhat spreading or partially drooping 

 branches, terete or nearly so ; leaves spreading or ascending, opposite on the lower part 

 of the stem, alternate above ; blades thinnish, spatulate to oblanceolate near the base of 



