GENTIANACEAE. 73! 



10. Sabbatia dodecandra (L.) B.S.P. LARGE MARSH PINK. (I. F. f. 

 2864.) Stem 3-6 dm. high, the branches alternate. Basal leaves spatulate, 

 obtuse, 38 cm. long; stem-leaves lanceolate or oblong -lanceolate, acute, the 

 uppermost usually narrowly linear; flowers few, pink, sometimes white, solitary at 

 the ends of the branches or peduncles; calyx-lobes narrowly linear, about one-half 

 as long as the 9-12 spatulate-obovate corolla-segments; anthers coiled; style deeply 

 2-cleit, its divisions clavate; capsule globose-oval, 6 mm. high. In sandy borders 

 of ponds and along salt marches, Mass, to Fla. and Ala. July-Sept. 



3. EUSTOMA Salisb. 



Glaucous annual herbs, with opposite sessile or clasping entire leaves. Flowers 

 large blue, purple or white, long-peduncled, axillary and terminal. Calyx deeply 

 5-6-cleft, the lobes lanceolate, acuminate, keeled. Corolla deeply 5-6-lobed, the 

 lobes oblong or obovate, convolute in the bud. Stamens 5-6, inserted on the 

 throat ol the corolla; filaments filiform; anthers oblong, versatile. Ovary i-celled; 

 stigma 2-lamellate. Capsule 2-valved. Seeds small, numerous, foveolate. [Greek, 

 open-mouth, referring to the corolla.] Two species, natives of the southern 

 U. S., Mex. and the W. Indies. 



i. Eustoma Russellianum (L.) Griseb. RUSSELL'S EUSTOMA. (I. F. f. 

 2865.) Stem terete, 3-8 dm. high. Leaves oblong or ovate-oblong, 3-5-nerved, 

 the upper usually acute at the apex, cordate-clasping at the base, 3-8 cm. long, 

 the lower usually obtuse and narrowed to a sessile or slightly auricled base; 

 peduncles 2-10 cm. long; bracts lanceolate-subulate, small; flowers 5-8 cm. 

 broad; calyx-lobes shorter than the purple corolla; corolla-lobes obovate, about 4 

 times as long as the tube; anthers remaining nearly straight. On plains, Neb. to 

 La., Tex. and Mex. May- Aug. 



4. GENTIANA L. 



Mostly perennial and glabrous herbs, with opposite or rarely verticillate, entire 

 sessile or short- petioled leaves. Flowers solitary or clustered. Calyx tubular, 

 4-7- (usually 5-) cleft. Corolla 4-7-lobed, often with membranous plaits in the 

 sinuses. Stamens as many as the lobes of the corolla and inserted on its tube, 

 included; anthers connate into a tube, or separate. Ovary i-celled; ovules very 

 numerous; stigma cleft into 2 lamellae. Capsule 2-valved. Seeds numerous. 

 [Named for King Gentius of Illyria.] About 300 species. Besides the following, 

 some 30 others occur in the western parts of N. Am. 



* Corolla without plaits or teeth in the sinuses; annuals. 

 Corolla-lobes fringed or serrate ; flowers 2-8 cm. 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. detonsa. 

 Corolla-lobes with entire or rarely denticulate margins; flowers 1-2.5 cm - long. 



Corolla-lobes fimbriate-crested at the base, acute. 4. G 7 . acuta, 



Corolla-lobes naked, subulate-acuminate. 



Calyx-lobes unequal; flowers mostly 4-parted. 5. G. propinqua. 



Calyx-lobes equal; flowers 5-parted. 6. G. guinquefolia. 



* * Corolla with membranous, toothed or lobed plaits in the sinuses; perennials. 

 Margins of leaves and calyx-lobes scabrous or ciliate; seeds winged. 

 Anthers separate, or merely connivent. 



Stems usually clustered; calyx- lobes unequal ; corolla narrowly funnelform. 



7. G. ajfinis. 

 Stems mostly solitary; calyx-lobes equal; corolla campanulate-funnelform. 



8. G. puberula. 

 Anthers cohering in a ring or short tube. 



Corolla-lobes distinct, longer than or equalling the plaits. 



Flowers 1-4; corolla campanulate-funnelform, its lobes 2-3 times as long as 



the plaits. 9. G. Elliottii. 



Flowers several or numerous; corolla club-shaped, its lobes not much 



longer than the plaits. 10. G. Saponaria. 



Corolla-lobes none or minute, the plaits very broad. n. G. Andrewsii. 



