64 



LINACEiE. 



Linum le^visii Pursh. (Lewis's Wild Flax), — A plant with slender leaves and 

 wand-like stems arising from a woody, perennial root, 1 to 2 feet high; common 

 in the Wtate, but rare in the desert. Red Desert, June 3 (3119). 



ANACARDIACEiE. 



Rhus trilobata Nutt. (Stinking Sumach). — A small, glabrous, branching shrub; 

 leaves, three-lobed; very common on dry ridges and canyon sides. Green River, 

 May 31 (3065). 



MALVACEiE. 



Malvastrum coccineum Gray (Red False Mallow). — A much-branched perennial 

 herb, with silvery leaves and large, red flowers. Plant not more than a few 

 inches high. Green River, May 31 (3057). 



LOASACEiE. 



Meutzelia sp. ( ?). — A small form not yet determined; possibly new. 



CACTACEiE. 



Echinocactus simpsoni minor Engelm. — A small, globular cactus; infrequent. 



South Butte, July 13 (3.-)53). 

 Opuntia polyacantha Haw. (Many-spined Opuntia). — Composed of many flat, 



obovate joints, flercely spiny. Very abundant. Wamsutter, .July 11 (3523). 

 Opuntia polyacantha platycarpa Coulter. — In general appearance very similar to 



the preceding. Both are here often called Prickly Pear cactus. Bitter Creek, 



July 12 (3528). 



ONAGRACEiE. 



Epilobium sp. (?). — Two species in this genus were collected, but they do not seem 

 to agree exactly with any of the descriptions at hand, so they are left unnamed. 

 Nos. 3512 and 4272, from South Butte and Creston, respectively. 



Taraxia breviflora Nutt. — A small, steuilcss plant, with a cluster of root-leaves 

 out of which the flowers hardly rise. Creston, August 29 (4273). 



Auogra albicaulis Brittou (Praikie Evening Primrose). — An herbaceous plant, 

 with rather slender white stems, almost simple or branched from the base, 

 G to 15 inches high; large wliite flowers, becoming pink as they grow older. 

 Green River, May 31 (3064); Point of Rocks, June 1 (3075). 



Chylisma scapoidea Small. — An herbaceous branching plant, with dark green 

 leaves, an<l naked lloweriug stems, from a few inches to a foot high. Common 

 especially on railroad embankments. Green River, May 30 (3025). 



UMBELLIFERiE. 



Peucedanum macrocarpum Nutt. ( LAiJCiE-FitunKD I'ahsi.kv). — A steniless form, 

 with dissected leaves spreading out close to the ground, ))roducing its flowers 

 and large seeds early in the season ; roots large and fleshy. Point of Rocks, 

 June 1 (30>6). 



Cymopterussp. ( ? ). — \ species of this genus that is as yet undcterniined was sciureil 

 at I'oint of Rocks, June 1 (30H3). 



GENTIANACEiE. 



Gentiana afllnis CJriseb. (Oiu.oN(;-leaki;i) (Jkntian). — A perennial with leafy cliis- 

 tired stems, 6 to 12 iucbes high. Common on low, wet ground. I'oiiit of Rocks, 

 August 30 (4275). 



