GENTIANACEAE. 



VOL. III. 



i 



i. Eustoma Russellianum (Hook.) Griseb. 

 Russell's Eustoma. Fig. 3346. 



Lisianthus Russellianus Hook. Bot. Mag. pi. 3626. 1839. 



Lisianthus glaucifolius Nutt. Trans. Am. Phil. Soc. (II.) 

 5:197. 1833-37. Not. Jacq. 1786. 



E. Russellianum Griseb. in DC. Prodr. 9: 51. 1845. 



Stem terete, rather stout, i-2i high. Leaves 

 oblong or ovate-oblong, 3-S-nerved, the upper usually 

 acute at the apex, cordate-clasping at the base, ii'-3' 

 long, the lower usually obtuse at the apex and nar- 

 rowed to a sessile or slightly auricled base ; pedun- 

 cles i '-4' long, stout, bracted at the base, the bracts 

 lanceolate-subulate, small; flowers 2' -3' broad; 

 calyx-lobes long-acuminate, shorter than the purple 

 corolla ; corolla-lobes obovate, about 4 times as long 

 as the tube ; style slender ; anthers remaining nearly 

 straight; capsule oblong, pointed. 



On prairies, Nebraska to Louisiana, Colorado, Texas, 

 New Mexico and Mexico. Canada pest. May-Aug. 



4. GENTIANA [Tourn.] L. Sp. PI. 227. 1753. 



Erect mostly glabrous herbs, with opposite or rarely verticillate, entire sessile or short- 

 petioled leaves. Flowers blue, purple, yellow or white, solitary or clustered, terminal or 

 axillary. Calyx tubular, 4-7- (usually 5-) cleft. Corolla tubular, clavate, campanulate, sal- 

 verform or funnelform (rotate in some exotic species ),4-7-lobed, often gland-bearing within, 

 the lobes entire or fimbriate. Stamens as many as the lobes of the corolla and inserted in its 

 tube, included; anthers connate into a tube, or separate, not recurved or coiled. Ovary 

 i-celled; ovules very numerous; style short or none; stigma cleft into 2 lamellae. Capsule 

 sessile or stipitate, 2-valved. Seeds numerous, sometimes covering the whole inner wall of 

 the capsule, wingless or winged. [Named for King Gentius of Illyria.] 



About 150 species, mostly natives of the north temperate and arctic zones and the Andes of 

 South America. Besides the following, some 20 others occur, in the western parts of North America. 

 Type species : Gentiana lutea L. 



Corolla-lobes fringed or serrate ; flowers i'-3' long. 



Corolla enclosed in the swollen wing-angled calyx. i. G. ventricosa. 



Corolla conspicuously longer than the wingless calyx. 



Corolla-lobes fringed all around their summits ; leaves lanceolate. 2. G. crinita. 



Corolla-lobes fringed mainly on the margins ; leaves linear. 3. G. procera. 



Corolla-lobes with entire or rarely denticulate margins ; flowers 6"-i2" long. 



Corolla-lobes fimbriate-crested at the base, acute. 4. G. acuta. 



Corolla-lobes naked, subulate-acuminate. 



Calyx-lobes unequal ; flowers mostly 4-parted. 



Calyx-lobes equal ; flowers 5-parted. 



5. G. propinqua. 



6. G. quinquefolia. 



i. Gentiana ventricosa Griseb. Swollen Gen- 

 tian. Fig. 3347. 



Gentiana ventricosa Griseb. in Hook. Fl. Bor. Am. 2: 65. 

 pi. 152. 1834. 



Annual; stem strict, terete, branched above, about i 

 high. Basal leaves obovate, small, those of the stem 

 ovate-oblong, obtuse or acute at the apex, rounded or 

 subcordate at the base, i' long, 4"-6" wide; flowers few, 

 solitary at the ends of stout peduncles, 4-parted ; calyx 

 inflated, ovoid, about 9" high, 4"~s" thick, wing-angled, 

 enclosing the corolla; corolla-lobes oblong, obtuse, lac- 

 erate-serrate ; ovary elliptic-oblong. 



Grand Rapids of Saskatchewan, between Cumberland 

 House and Hudson Bay (Drummond). Not recently col- 

 lected. 



