



200 BOTANY OF THE DEATH VALLEY EXPEDITION. 



Tlio prevailing form of S. nigra throughout western Texas, Now Mexico, Arizona, 

 and southern California. The varietal name may he regarded as tentative. Should 

 variety wightii of Andersson prove to have been founded upon an abnormal growth of 

 this variety, the name wrightii should be taken instead. Specimens were col- 

 lected at Resting Springs (No. 262); at Winters's ranch, Pah rump Valley, Nevada 

 (No. 295); at Ash Meadows, Nevada (No. 2145); at Furnace Creek Ranch (No. 469); 

 in Mill Creek Canon, Pananiint .Mountains (No. 805); and on the Tulare Plains, 

 about 10 kilometers south of Bakersfield (No. 1236). [At all ihese points the tree oc- 

 curred iu the Lower Sonoran zone, growing in the moist soil about springs or streams, 

 or on irrigated laud. It was often planted in such places as a shade tree. — F. v. c] 



Popnlus fremontli Wats. Proc. Amor, Acad. x. 350 '(1875). Typo locality, "on 

 Deer Creek at 'Lassens' in the Upper Sacramento Valley." 



The name Populus fremontii is here used for the Cottonwood of the desert region 

 which has sometimes been designated P. fremontii mslizeni. While a difference 

 may exist between this plant and the tree of central California, neither the speci- 

 mens in the National Herbarium nor the published descriptions give any real idea 

 of the nature of that difference. The tree was cultivated at Furnace Creek Ranch 

 (No. 470), and occurred also along the Mohave River at Victor; at Cottonwood 

 Spring, Vegas Valley ; along Cottonwood Creek, on the west side of Owens Lake (No. 

 973); and iu Cottonwood Canon, Panamint Mountains. The tree is often cultivated 

 for shade at the desert ranches, but it cannot exist without an abundant supply of 

 water. 



Populus monilifera Ait. Hort. Kew. iii. 400 (1789). Type locality, "Canada." 



Specimens were collected from trees growing iu a wild state along Cottonwood 

 Creek, on the west side of Owens Lake (No. 990), and in the lower part of the Ca- 

 nada do las Uvas (No. 1103). The tree was found also iu the canon east of Tejon 

 Ranch. 



Professor C. S. Sargent, to whom specimens wore sent, says: "Dr. Parry sent me 

 some years ago specimens, from trees cultivated in San Bernardino, of what is evi- 

 dently the same thing. Ho thought it might bo a new species, as it was said to have 

 beeu brought from mountains in the neighborhood. I thought, however, that it had 

 beon carried to California from the East and that it was the common Cottonwood. 

 * I should now be inclined to believe that the western range of Populus 

 monilifera ought to be extended to take in southeastern California." 



So far as is known at present the range of this species in California is confined to 

 the southern Sierra Nevada and the San Bernardino Mountains, at altitudes below 

 the yellow ami black pine timber. 



Populus tremuloides Mx. Fl. ii. 213 (1803). Typo locality, "in Canada et 

 Noveboraoo." 



Near Mineral King (No. 1470). 



Populus trichocarpa Torr. «fc Gr. in Hook. Ic. PI. ix. 878 (1850?). 



This tree was found at several points in the Sierra Nevada, namely, in Tejon Caflon 

 (No. 1215), at Mineral King, in Kings River Canon (No. 2106), and along the Hockett 

 Trail on the eastern slope of the mountains. 



CERATOPHYLLACEiE. 



Ceratophyllum demersum L. Sp. PI. ii. 991' (1753). Type locality European. 

 Near San Bernardino (No. 25) and near Bakersiield (No. 1242). 



ORCHIDACEiS. 



Corallorhiza multiflora Nutt. Jouru. Acad. Phil. iii. 138 (1823). Type locality, 

 "From New England to Carolina." 



Near Mineral King (Nos. 1382, 1422). 



