GENTIAN AC E^E. (GENTIAN FAMILY.) 245 



expanded; the lobes or plaits in the sinuses broad and emarginate: anthers 

 cordate. 



7. G. humilis, Stev. Stems single or numerous, 1 to 5 inches long, 

 erect or ascending : leaves glaucescent and broadly white-margined ; the radical 

 orbicular or ovate and rosulate ; cauline linear-oblong, erect, connate-sheathing, 

 2 or 3 lines long : corolla whitish or dull-colored ; its tube little exceeding the 

 calyx ; the limb inch in diameter : capsule clavate-obovate, at length exserted 

 on a long and stout stipe much beyond the flower. Grassy banks in the moun- 

 tains from Colorado to Wyoming. 



8. G. prostrata, Haenke. Stems weaker than in the preceding, and when 

 elongated the lateral ones often procumbent : leaves ovate, less erect, greener, and 

 less white-margined: flower 4-merous: corolla azure-blue, in fruit enclosing the 

 linear-oblong rather short-stipitate capsule. Alpine regions from Colorado 

 northward. 



* * Flowers comparatively large, mostly short-peduncled or sessile : anthers 

 linear or oblong: usually a pair of bracts under the flower. 

 - Dwarf, 1 to 3-flowered: cauline leaves only 2 to 4 pairs. 



9. G. frigida, Haenke. Stems 1 to 5 inches high : leaves linear, varying 

 to lanceolate or spatulate, thickish, the pairs connate-sheathing at base : calyx- 

 tube obconical: corolla funnelform, l inches long, yellowish white or tinged 

 with blue, purplish-dotted ; the lobes short and broad ; the plaits entire and 

 broad but slightly extended at summit. Including var. algida, Pall. Alpine 

 regions of Colorado, Utah, and northward. 



H- H- Low: stems several from the same caudex: cauline leaves 6 to 16 pairs, 

 more or less connate or even sheathing at base; the uppermost involucrate 

 around the sessile terminal flower or 3 to 5-flowered cluster : corolla blue, 1 to 

 l inches long ; the lobes broadly ovate, and the appendages at the sinuses 2-cleft 

 or lacerate. 



10. G. calycosa, Griseb. A span or more high : leaves ovate; the low- 

 est pairs usually smaller and with connate-sheathing base, the upper hardly 

 so ; the involucrate uppermost leaves somewhat exceeding the calyx of the com- 

 monlij solitary flower : calyx-lobes ovate or oblong, or even subcordate, about the 

 length of the tube : corolla oblong-fun nelform, its appendages in the sinuses 

 triangular-subulate, laciniate, or 2-cleft at the tip. California and Oregon to 

 Montana, Wyoming, and northward. 



11. G. Parryi, Engelm. A span or more high : leaves glaucescent, thick- 

 ish, ovate, varying to oblong-lanceolate, most of the pairs with a somewhat 

 sheathing base ; the involucrate uppermost 2 or 3 concealing the calyx and some- 

 times almost equalling the corolla of the 1 to 5 flowers: lobes of the calyx short- 

 linear, more or less shorter than the tube : appendages at the sinuses of the corolla 

 narrow, deeply 2-cleft. Trans. St. Louis Acad. ii. 218. Alpine and subalpiue 

 regions of New Mexico, Colorado, Utah, and Nevada. 



H_ ^_ -H_ Stems rather taller, man //-leaved : flowers not involucrate : the laciniate- 

 toothed or cleft appendages at the sinuses of the corolla sometimes almost equal- 

 ling the lobes. 



12. G. affinis, Griseb. Stems clustered, a span or more high : leaves 

 from oblong or lanceolate to linear : flowers from numerous and thyrsoid- 

 racemose to few or rarely almost solitary : bracts lanceolate or linear : calyx- 



