. 



CATALOGUE OF SPECIES. 129 



This shrub was recorded at several points between Daggett and Lone Willow 

 Spring; on Browns Peak; on Lone Willow Peak; in Long Valley (No. 191); near 

 Bennett Wells, in Death Valley; near Saratoga Springs; in Kesting Springs Valley; 

 west of Amargosa, in the Funeral Mountains; between Furnace Creek and Ash 

 Meadows; between the latter point and Pahrmnp Valley; in Vegas Valley; in the 

 Vegas Wash ; on the divide northwest of Towner's ; near the summit station, between 

 Mohave and Searles's; in Willow Creek and Mill Creek (No. 754) canons, Pana- 

 mint Mountains; in a canon near Swansea; between Keeler and Crystal Spring; on 

 both slopes of Walker Pass; in Tehachapi Canon; and in Antelope Valley. Dr. 

 Merriam reported it also from Deep Spring Valley, California; from Grapevine 

 Canon, and Oasis, Emigrant, Timpahute, Pahranagat, Virgin, and Indian Spring 

 valleys, Nevada; and the Beaverdam Mountains and Santa Clara Valley, Utah. 

 The plant grows from the lower to the upper limit of the Larrta belt, sometimes 

 reaching into the Upper Sonoran zone. Its favorite habitat is the soil of sandy 

 washes. 



Franseria acanthicarpa (Hook.) Fl. Bor. Amer. i. 309 (1834), under Ambrosia. 

 Type locality, " banks of the Saskatchawan and Red River." 



Nuttall 1 referred Hooker's Ambrosia acanthicarpa to the genus Franseria with the 

 speciiic name hookeriana, and used this name only for the plant of the Saskatchewan 

 and Columbia River regions, a plant with linear lobes of the leaves, and not canes- 

 cent. The southern form, to which our specimen belongs, common in California and 

 the Great Basin region, with broader leaf-lobes and canescent with appressed hairs, 

 ho considered distinct and named Franseria montana, its type locality being "in the 

 Eocky Mountains near the Colorado of the W T est." Torrey and Gray, 2 however, 

 united the two and the aggregate has since passed as F. hookeriana. 



The plant was seen at San Bernardino (No. 11); on the banks of the Mohave at 

 Daggett; near Lone Pine; and at several points along our route from the latter 

 place to Visalia. It often occurred as a weed in cultivated soil. 



Franseria dumosa Gray in Frem. Second Rep. 310(1845). Type locality, "on the 

 eandy uplands of the Mohahve river." 



This shrub as stated in the narrative portion of the report, is, next to Larrca triden- 

 tata, the most characteristic plant of the Lower Sonoran zone. Its range practically 

 coincides with that of Larrea tridcnlata and need not be given here. Specimens 

 were collected near Keeler (No. 844). 



The plant has an economic interest in being preferred for forage, by horses, to all 

 the other desert shrubs. When, therefore, they are unable to find grass, this shrub 

 will keep them from starvation for a time. 



Franseria eriocentra Gray, Proc. Amer. Acad. vii. 355(1^68). Type locality, 

 "east slope of Providence Mountain, Arizona." The Provblence Mountains are not 

 in Arizona, but near Ivanpah, in the northeastern part of San Bernardino County, 

 California. 



This shrub occurred on the western slope of the Charleston Mountains, both on 

 the road to Clark's sawmill (No. 297) and on the road to Mountain Springs Pass, in 

 the latter place at an altitude of about 1,200 meters. At both points the plants grew 

 in the dry, gravelly bottom of a broad wash. Mr. Bailey collected the plant also at 

 Beaverdam, Arizona (No. 1938). It was found by Dr. Merriam in Pahranagat Valley, 

 Hyko Mountains, Pahranagat Mountains, and on Hungry Hill Summit. 



Xanthium spinjisum L. Sp. PI. ii. 987 (1753). Type locality European. 

 Between Kernville and Caliente, and at i'reipient intervals in the Tulare Plains. 



1 Trans. Amer. Phil. Soc. new ser. vii, 345 (1841). 



2 Torr. & Gr. Fl. ii, 294 (1842). 



