Genus 5. 



GEXTIAX FAMILY. 



1. Dasystephana affinis (Griseb.) Rydb. Ob- 

 long-leaved Gentian. Fig. 3353. 



Gentiana affinis Griseb. in Hook. Fl. Bor. Am. 2: 56. 1834. 

 D. affinis Rydb. Bull. Torr. Club 33: 149. 1906. 



Perennial; stems clustered from deep roots, minutely 

 puberulent, simple, 6'-i8' high. Leaves linear-oblong 

 to lanceolate-oblong, obtuse or acutish, rounded or 

 narrowed at the base, firm, roughish-margined, indis- 

 tinctly nerved, l'-li' long, the floral smaller; flowers 

 few, numerous, or rarely solitary, 5-parted, sessile and 

 solitary or clustered in the axils of the upper leaves, 

 about 1' high, not bracted under the calyx ; calyx-lobes 

 linear of subulate, unequal, the longer about equalling 

 the tube, the smaller sometimes minute ; corolla nar- 

 rowly funnelform, blue, its lobes ovate, acute or mu- 

 cronate, entire, spreading, with laciniate appendages in 

 the sinuses; anthers separate; seeds broadly winged. 



In moist soil, Minnesota to British Columbia, south in 

 the Rocky Mountains to New Mexico. Aug.-Oct. 



2. Dasystephana puberula (Michx.) Small. 

 Downy Gentian. Fig. 3354. 



Gentiana puberula Michx. Fl. Bor. Am. 1 : 176. 1803. 

 D. puberula Small, Fl. SE. U. S. 930. 1903. 



Perennial; stems usually solitary, leafy, 8'-i8' high, 

 minutely puberulent or glabrous, nearly terete. Leaves 

 firm, lanceolate, or the lower oblong, roughish- 

 margined, indistinctly nerved, pale beneath, nar- 

 rowed or rounded at the base, 1-3' long; flowers 

 sessile or nearly so in the upper axils, rarely soli- 

 tary and terminal, 2-bracteolate under the calyx, 

 1Y-2' high ; calyx-lobes linear-lanceolate, equal, about 

 as long as the tube, rough ; corolla campanulate- 

 funnelform, 2-3 times as long as the calyx, its lobes 

 ovate, entire, spreading, much longer than the cleft 

 or laciniate appendages ; anthers at first connivent, 

 soon separate; seeds oblong, broadly winged. 



On prairies, Maryland to Ohio, Minnesota, South 

 Dakota, Georgia and Kansas. Aug.-Oct. 



3. Dasystephana parvifdlia fChapm.) 

 Small. Elliott's Gentian. Fig. 3355. 



^Gentiana rigida Raf. Med. Fl. 1: 212. 1S32. 

 Gentiana Elliottii Chapm. Fl. S. States, 356. i860. 



Xot Raf. 

 IGentiana seaberrima Kusnezow, Act. Hort. Petrop. 



13: 59. 1893. 

 D. farvifoha Small, Fl. SE. U. S. 930. 1903. 

 D. latifclia Small, Fl. SE. U. S. 930. 1903. 



Perennial: roots a cluster of thick fibres; stems 

 slender, leafy, terete, minutely rough-puberulent, 

 simple, 8'-2 high. Leaves ovate or lanceolate, 

 acute or acutish at the apex, rounded or narrowed 

 at the base, thin, roughish-margined, 1-2' long, 

 3-nerved, or the lower much smaller and obtuse; 

 flowers 1-4, terminal, or rarely I or 2 in the 

 upper axils, about 2' long, sessile. 2-bracteolate 

 under the glabrous calyx ; calyx-lobes oblong or 

 lanceolate, foliaceous, longer than the tube; co- 

 rolla campanulate-funnelform, blue, its lobes 

 ovate, obtuse, sometimes mucronate, entire, 3" 4" 

 long, about twice as long as the fimbriate or 

 toothed appendages ; anthers cohering in a tube ; 

 seeds oblong, broadly winged. 



In moist soil, Virginia to Florida. Sampson snake-root. Sept.-Oct. 



Gentiana decora Pollard, of the same range, differs in having the calyx-tube 



pubescent. 



