246 GENTIANACE.E. (GENTIAN FAMILY.) 



lobes linear or subulate, unequal and variable, the longest rarely equalling the 

 tube, the shorter sometimes minute : corolla an inch or less long, rather narroivhj 

 fnnnelform; its lobes ovate, acutish or mucronulate-pointed , spreading. From 

 the mountains of New Mexico and California to British Columbia and the 

 Saskatchewan. 



13. G. Bigelovii, Gray. Very similar to the last, but the corolla is oblong, 

 with shorter lobes, and bears salient crenulate or roughened ridges which in the 

 bud externally border the infolded plicae : the stipe is shorter and broader and 

 completely fistulous. Proc. Am. Acad. xix. 87. G. affinis in part. Colorado 

 to Arizona. 



14. G. ForWOOdii, Gray. Resembling G. affinis, but the corolla decidedly 

 smaller (f- inch long), narrow, and with shorter and rounder lobes, these little sur- 

 passing the plical appendages: stems 6 to 12 inches high and equably leafy to 

 the very top : calyx subcampanulate, with no vestige of lobes or teeth. Proc. 

 Am. Acad. xix. 86. High meadows of the Wind River Mountains, Wyoming. 



3. PLEUROGYNE, Eschsch. 



Small annuals of cold regions, with blue or whitish flowers, and distin- 

 guished by the remarkable decurrent stigmas. 



1. P. TOtata, Griseb. Stems 2 to 10 inches high, the smaller simple and 

 1-flowered ; the larger either simple and racemosely several-flowered or fasti- 

 giately much branched : leaves linear or lanceolate, or the radical ones short 

 and spatulate : sepals similar to the upper leaves : lobes of the corolla bearing 

 at base a pair of glandular and scale-like processes. In subalpine regions of 

 Colorado and northward throughout British America. 



4. SWERTIA, L. 



Simple-stemmed perennials, occasionally with alternate leaves, the lower 

 tapering into a margined petiole : inflorescence thyrsoid : flowers blue, varying 

 to white. 



1. S. perennis, L. A span or more high: lowest leaves oblong or 

 obovate-spatulate (2 to 4 inches long) ; upper cauline few and narrower, ses- 

 sile : inflorescence racemiform or narrowly paniculate, few to many-flowered : 

 sepals narrowly lanceolate : lobes of the corolla bearing at base a pair of 

 nectariferous pits which are crested with a fringe. Colorado, Utah, and 

 northward. 



5. PRASERA, Walt. 



Large and stout herbs ; with single erect stem from a thick bitter root, the 

 broader leaves commonly nervose, inflorescence thyrsoid with copious flowers 

 and dark-dotted corolla. 



1. P. speciosa, Dougl. Stem 2 to 5 feet high, very leafy : leaves in 4's 

 and 6's ; the radical and lowest cauline obovate or oblong, 6 to 10 inches long ; 

 the upper lanceolate and at length linear : flowers very numerous in a long 

 leafy thyrsus : lobes of the greenish-white or barely bluish and dark-dotted 

 corolla oval-oblong, bearing a pair of contiguous and densely long-fringed 

 glands about the middle, and a distant transversely inserted and setaceously 

 multifid scale-like crown near the base. In the mountains from Wyoming to 

 Oregon, and southward to New Mexico and California. 



