GENUS 2. 



FLAX FAMILY. 



439 



6. Cathartolinum sulcatum (Riddell) Small. 

 Grooved Yellow Flax. Fig. 2682. 



Linum sulcatum Riddell, Suppl. Cat. Ohio PL 10. 1836. 

 Linum Boottii Planch. Lond. Journ. Bot. 7: 475. 1848. 

 ?Linum simplex Wood, Bot. & Flor. 66. 1870. 

 Cathartolinum sulcatum Small, N. A. Fl. 25*: 78. 1907. 



Annual, simple or branched, i-2 high. Stem 

 wing-angled and grooved, at least above; leaves 

 alternate, lanceolate or linear, 8"-i2" long, l"-ij" 

 wide, acute or acuminate, 3-nerved, the lower gla- 

 brous, the upper smaller and glandular-ciliate, as are 

 the floral bracts and sepals; stipules represented by 

 a pair of small globose dark-colored glands; flowers 

 racemose or corymbose, about 6" broad, yellow ; 

 pedicels i"-4" long; sepals lanceolate, acute, slightly 

 longer than the ovoid, acute, incompletely lo-celled 

 pod ; styles separate above the middle ; septa of the 

 capsule ciliate. 



In dry soil, Ontario to Manitoba, Massachusetts, 

 Georgia, west to Texas, rare near the Atlantic coast. 

 Summer. 



7. Cathartolinum rigidum ( Pursh) 



Small. Large-flowered Yellow 



Flax. Fig. 2683. 



Linum rigidum Pursh, Fl. Am. Sept. 210. 



1814. 

 Cathartolinum rigidum Small, N. A. Fl. 25* : 



82. 1907. 



Perennial (?), 6'-i5' high, branched, 

 glaucous, glabrous or puberulent. 

 Branches stiff, more or less angular; 

 leaves erect, linear or linear-lanceolate, 

 4"-: 2" long, i"-i" wide, acute or mu- 

 cronate, the upper ones glandular-serru- 

 late or ciliate ; stipular glands minute, 

 globose, sometimes wanting ; flowers yel- 

 low, 9"-i5" broad; sepals lanceolate, 

 acute or awn-pointed, glandular-serru- 

 late, the outer ones becoming 3"-4" 

 long; petals cuneate-obovate, twice the 

 length of the sepals ; styles separate 

 only at the summit ; capsule ovoid, 

 5-valved, shorter than the sepals, 2"-2i" 

 long. 



Prairies, Saskatchewan to Manitoba, Mis- 

 souri, Texas and Colorado. Summer. 



8. Cathartolinum Berlandieri (Hook.) Small. Ber- 

 landier's Yellow Flax. Fig. 2684. 



Linum Berlandieri Hook. Bot. Mag. sub pi. 3480. 1836. 



L. arkansanum Osterhout, Bull. Torr. Club 28: 644. 1901. 



C. Berlandieri Small, N. A. Fl. 25' : 82. 1907. 



Annual (?),2i'-i6' high, often much-branched, bright green 

 and sometimes glaucescent when young. Branches ascending, 

 striate-winged ; leaves spreading or ascending, linear to nar- 

 rowly linear-lanceolate, mostly 7"-2o" long, acuminate; stipu- 

 lar glands, when present, short; bracts glandular-toothed; 

 flowers bright yellow, i6"-24" broad; sepals lanceolate, the 

 outer ones becoming 4^"-5J" long, all evenly glandular- 

 toothed; petals obovate, 85"-u" long; capsule ovoid, 2"-2i" 

 long. 



In dry soil, Kansas and Colorado to Texas. Spring. 



Cathartolinum compactum (A. Nelson) Small, a species re- 

 lated to C. rigidum, ranges from the Rocky Mountain region into 

 North Dakota and Kansas. It is a low dull green plant with small 

 flowers, the petals less than 5" long. 



