LINACEAE 663 



narrower than the inner ones. 13. C. elongatum. 



Outer sepals with prominent lateral ribs. 



False septa of the capsule slightly thickened. 14. C. rigidum. 



False septa of the capsule thickened for about one half 



their length. 15. C. Berlandieri. 



Outer sepals much shorter than the inner: leaf-blades spatulate 



to narrowly oblong, prominently 3-ribbed. 16. C. sanctum. 



Inner and outer sepals with broad scarious erose-ciliate margins. 17. C. mullicaule. 



1. Cathartolinum striatum (Walt.) Small. Stems 2-8 dm. tall, paniculate, 

 winged below the nodes: leaves mainly opposite; blades oblong or elliptic, 1-3 cm. 

 long: outer 'sepals lanceolate to oblong-lanceolate, 2-2.5 mm. long; inner sepals ovate 

 to suborbicular : capsules depressed-globose, 2 mm. broad. 



In low grounds, Ontario to Arkansas, Florida and Texas. Summer. 



2. Cathartolinum Virginiinum (L.) Small. Stems 2-6 dm. tall, corymbose 

 above, the branches long: leaves mainly alternate, spreading; blades thinnish, spatu- 

 late to oblanceolate or elliptic, 1-3 cm. long: outer sepals lanceolate to oblong- 

 lanceolate, 2-3.5 mm. long; inner sepals rather broader than the outer: capsules 

 depressed, 2 mm. broad. 



In dry soil, Maine and Ontario to Georgia and Alabama. Summer. 



3. Cathartolinum medium (Planch.) Small. Stems 3-6 dm. tall, corymbose 

 above, the branches rigid: leaves mainly alternate, erect or appressed; blades sj^atu- 

 late to linear-elliptic or linear-lanceolate, 0.6-2 cm. long: outer sepals oblong to 

 lanceolate, 2-4 mm. long: capsules depressed-globose, 2-3 mm. broad. 



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



4. Cathartolinum Curtissil Small. Stems 2-6.5 dm. tall, corymbose above: 

 leaves mainly alternate, ascending or erect; blades oblong-spatulate to oblanceolate or 

 linear above, 0.5-1.5 cm. long: outer sepals ovate, 2-2.8 mm. long: capsules spheroidal, 

 about 2.5 mm. broad. 



In the Everglades, Florida. Also in the Bahamas. Spring to fall. 



5. Cathartolinum Plorid^num (Planch.) Small. Stems 3-8 dm. tall, corym- 

 bose: leaves mainly alternate, nearly erect or appressed; blades oblanceolate to linear- 

 lanceolate or linear above, 0.8-1.8 cm. long: inner sepals ovate to oblong-ovate, nearly 

 jis long as the outer ones: capsules ovoid, 2-2.5 mm. broad. 



In sandy soil, Massachusetts and southern Indiana to Florida and Louisiana. Summer. 



6. Cathartolinum macrosfepalum Small. Stems 2.5-9 dm. tall, corymbose: 

 leaves alternate, erect-ascending or appressed; blades linear-subulate to subulate, or 

 narrowly linear or linear-spatulate near the base of the stem, 1-1.5 cm. long: inner 

 sepals lanceolate to elliptic-lanceolate, much shorter than the outer ones: capsules 

 ovoid, 2-2.5 mm. broad. 



In the Everglades, southern Florida. Spring and summer. 



7. Cathartolinum arenicola Small. Stems or branches 2-7 dm. tall: leaves 

 alternate, early deciduous; blades, at least of the leaves above the base of the stem, 

 subulate to subulate-acicular, mostly less than 1 cm. long, entire: outer sepals 

 broadly oblong to oblong-ovate, becoming 2.5-3 mm. long, acuminate: capsules de- 

 pressed, about 1.5 mm. long. 



In pine lands, southern peninsular Florida and Pine Key. Spring. 



8. Cathartolinum rup6stre (Engelm.) Small. Stems or branches 2-4 dm. tall: 

 leaves scattered, rather deciduous; blades linear to subulate, 0.3-1.1 cm. long: outer 

 sepals lanceolate to elliptic, 3 mm. long, subulate-tipped or long-acuminate: capsules 

 ovoid-spheroidal, about 2 mm. broad. 



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



9. Cathartolinum Hdrperi Small. Stems 3-8 dm. tall : leaves mainly alternate ; 

 blades linear-spatulate to narrowly linear, 0.5-2 cm. long: outer sepals lanceolate, 

 3.5-4 mm. long, sparingly toothed: capsules ovoid, 2.5 mm. long, obtuse. 



In pine lands, Georgia and Florida. Summer. 



10. Cathartolinum sulcatum (Ridd.) Small. Stems 2-7 dm. tall: leaf -blades 

 linear to linear-lanceolate, 0.8-2.5 cm. long: outer sepals lanceolate, 5-6 mm. long, 

 copiously toothed: capsules ovoid, about 3 mm. long. 



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



