CATALOGUE OF SPECIES. 141 



but from the hairs about it appears obtuse, and somewhat resembles that of Tetra 

 dymia. The plant forcibly suggests the reuniting of Lepidospartum with Tetradymia, 

 as a subgenus, a position in which Dr. Gray once placed it, but the involucres of 

 the two genera are of quite different types. 



''Type specimen in the United States National Herbarium, No. 558, Shockley, 1888; 

 collected in August, 1888, in Soda Springs Canon, Esmeralda County, Nevada, by W. 

 H. Shockley." 



Specimens were collected in the Charleston Mountains, near Clark's sawmill (No. 



309). 



Tetradymia canescens DC. Prodr. vi. 440 (1837). Type locality, "in American 

 borealis ora occidentali ad Columbia river." 



The Tetradymia canescens of the Rocky Mountain region is all referable to T. canes- 

 cens inermis, the type locality of which is "on the dry barren plains of the Rocky 

 Mountains. Common particularly near Lewis River of the Shoshonee, but not in 

 the plains of Oregon.'' Our No. 1601 differs from this in its larger leaves, longer 

 involucres (9 to 11 mm.) and flowers, and crucially in its glabrous achenia. In T. 

 canescens inermis the involucral scales are 5.5 to 7 mm. long. No. 6144, Bolander, 

 1866, from "Mono Lake," and No. 681, King Survey, from Virginia Mountains, Ne- 

 vada, alt. 6,000 feet, are the same as our plant. Those plants were referred by Gray 

 to the type form of the species. I have been unable to see the type specimen of it. 

 Nob. 785 and 2007 are fragmentary winter specimens, doubtfully referable here, per- 

 haps belonging to T. canescens inermis. The former was collected on Mount Magru- 

 der, Nevada, the latter on the Tanamint Mountains, near the head of Willow Creek. 

 The same plant was seen on the crest of the Panamints, north of Johnson Canon, at 

 an altitude of 3,000 meters. No. 1601 was collected -on the North Fork of Kern 

 River, near Soda Springs, in the belt of Finns jeffreyi. 



Tetradymia comosa Gray, Proc. Amer. Acad. xii. 60 (1876). Type locality, 

 " W. Nevada," " S. E. borders of California," " Potrero, San Diego Co.," California. 



Observed on the first divide north of Daggett, on the road to Lone Willow Spring; 

 on the northeast slope of Lone Willow Peak; at the summit station between Searles's 

 and Mohave; in Mill Creek Canon, Panamint Mountains; near Crystal Spring, Coso 

 Mountains; at several points between Lono Pine and Indian Wells; and on both 

 slopes of Walker Pass. The plant occupies in this region the upper altitudes of the 

 Lower Sonoran zone. Some of the localities recorded may belong to T. stenolepis. 



Tetradymia glabrata Gray, Pac, R. Rep. ii. pt. ii. 122 (1855). Type locality, 

 "on the Sierra Nevada," California. 



This plant occurred sparingly about the summit station on the road from Searles's 

 to Mohave and abundantly in the desert plains about Lone Pine. Specimens were 

 collected by Mr. Bailey near Panaca, Nevada (No. 1978), and in Sarcobatus Flat, 

 Ralston Desert (No. 2001). Dr. Merriam reported it also in Nevada., between Gold. 

 Mountain and Mount Magruder, in Grapevine Canon, Sarcobatus Flat, and Oasis, 

 Emigrant, Timpahute, Pahranagat, Desert, and Meadow Creek valleys. The plant 

 belongs to the upper part of the Lower Sonoran zone. 



Tetradymia spinosa Hook. & Am. Bot. Beech. 360 (1810-41). Type locality, 

 " Snake Country," Idaho. • 



This species was found on the Beaverdam Mountains, Utah (No. 1949) ; on the 

 western slope of the Charleston Mountains, along the roads to Clark's sawmill and 

 to Mountain Springs; near Cottonwood Springs, Vegas Valley ; in Johnson and Willow 

 Creek canons, Panamint Mountains; near Crystal Spring, Coso Mountains (No. 930) ; 

 and on both slopes of Walker Pass. It is a shrub characteristic of the upper portion 

 of the Lower Sonoran zone. Dr. Merriam reported it also in Deep Spring Valley, 

 California; in Gold Mountain, the Highland Range, and in Oasis, Emigrant, Timpa- 

 hute, and Pahranagat valleys, Nevada; and the Beaverdam Mountains, Utah. 



