CATALOGUE. 193 



mostly ascending; leaves from oblong to lanceolate or linear; flowers 

 small for the section, 1-1 J' long, usually clustered in the axils of the 

 upper leaves, rarely few ; bracts lance-linear ; calyx-lobes linear, unequal, 

 usually shorter than their sometimes cleft tube; lobes of the blue corolla 

 acute, plaits bifid, anthers unconnected ; sessile stigmas lanceolate ; seeds 

 narrowly, or sometimes more broadly, winged. 



Wet, grassy places in the Eocky Mountains of Colorado and Utah. 

 The numerous thin seeds are borne on the whole inner surface of the cap- 

 sule, which thus not only has the function of a placenta, but really seems 

 to be nothing but a thin, membranaceous expansion of the placentas them- 

 selves, forming a free sac within the capsule, which originates from the 

 commissures of the carpels, and remains attached to them only, and is at 

 last otherwise entirely unconnected with the walls of the capsule. It is 

 probable that all the Pneumonanthes with ovules from the entire inner sur- 

 face of the capsule have this structure, and that in the others the ordinary 

 arrangement of commissural placentae prevails. 



Gentiana sekrata, Gun. Fl. Norveg. 10. Gray, Synops. 117. (G. 

 detonsa, Rottb. Fries, Gray's Manual ed. 5th, 387.) — Low, simple specimens, 

 a few inches high, with single flowers, 1-1 J' long. Mount Graham, Ariz. 

 (751), at 9,000 feet altitude. 



The Norwegian specimens of this plant in my herbarium have much 

 smaller flowers than ours and much smaller seeds. The "scales" which 

 roughen the surface of the seeds prove, when moistened, to be transparent 

 vesicles, single protruding cells of the epidermis. In the Norwegian form, 

 these vesicles are small, oblong, or cylindric; in the American specimens, 

 they are much larger and mostly hemispherical ; in the allied O. crinita, I 

 find them large and oblong. 



Gentiana baebellata, Engelm. Trans. Acad. St. Louis, 2, 216, pi. 

 1 1 . — Has thus far been found only in the mountains of Colorado, near the 

 timber-line, and is a very distinct species, which can in no way be con- 

 founded with serrata or simplex. I have already, in the first account of this 

 species, given the diagnostic characters, and have also stated that it is the 

 only perennial one of the section Crossopetalum in America, somewhat allied 

 13 BOT 



