244 NELSON: NEW PLANTS FROM WYOMING 
large membranaceous leaves, somewhat trilobed petals (hence the 
name), and ovoid capsules with broad reticulated wings. None 
of these characters apply to Z. flava. It has a capsule both 
relatively and actually longer than that of the other, with narrow 
wings and not very evident reticulation. In the seeds we find 
further evidence of the distinctness of the two since L. fava does 
not possess the tubercle on the inner upper face nor the broad 
tooth at the apex. 
Dr. Watson seems to be the only one who has called attention 
to the yellow flowers of this western form, which he has done in 
two instances, viz., Bot. King’s Rep. 107, and FI. Calif. 1: 224; and 
in both cases he was, of course, dealing with the western plants. 
I do not venture to say that all the plants of the west that 
have heretofore been called Z. tviloba belong to L. fava. That 
can only be determined by finding whether they have the charac- 
ters of the latter. Hence I name a type, my xo. 219, Laramie, 
June, 1894, and as illustrative of it all of my numbers, distributed 
from time to time, under the name Lavauxia (Oenothera) triloba. 
, Gentiana monantha sp. nov. 
An alpine annual, mostly much less than 1 dm. high: stem 
simple or with one or two branchlets from the base, very short, of 
few internodes, only 1-3 cm. high, terminated by a slender naked 
one-flowered peduncle very much longer than the stem; te 
accessory branchlets (if any) tardily developed and with a shorter 
peduncle : leaves oblong to spatulate, 5-10 mm. long: calyx one 
fourth shorter than the corolla and somewhat exceeding its tube, 
sepals 4, equal, oblong-lanceolate, subacute, distinct nearly to the 
base: corolla about 12 mm. long, its tube twice as long as the 4 
lance-ovate subacute lobes ; the fimbriae of the crown rather coarse 
and short : stamens shorter than the corolla-tube. 
This is G. tenella, in so far as the plant of the southern Rocky 
Mountains is concerned. Seemingly very rare and probably not 
well represented in the herbaria. Most of what has been dis- 
tributed as G. /ene/la, in so faras my own specimens are concerned, 
belongs to other species (G. acuta, G. heterosepala, etc.). The 
true G. tenella Rottb. is an arctic plant with 5-merous flowers, the 
obtuse corolla-lobes as long as its tube; the calyx only half as 
long as the corolla and with unequal sepals. 
Et i Sere 
