June 30, 1913 59 
only a fragment, but Mr. Davis’ photograph and accurate field 
notes 1ender the determination entirely satisfactory. The sta- 
tion is about twenty-five miles from the Mexican boundary, and 
is described by the collector as “‘very isolated, rocky, miles from 
water, and in a most sterile and forbidding part of the desert, at 
the foot of barren, rocky mountains. The trees, more than fifty 
in number, grow along the banks of dry washes, in hard, sterile 
soil, covered with boulders. "They were associated with cactus, 
Ocatilla and other desert shrubs.” The nearest station known 
to the writer is Maricopa, Arizona, and it is reported from adja- 
cent Sonora and Lower California. 
MALVA SYLVESTRIS L. Sp. Pl. 689. 1753. 
In an orchard at Oak Glen, about 5000 feet altitude, in the 
San Bernardino mountains, near Redlands, July, rg12, S. A. 
Pease. Said to be well established, and perhaps adventive. 
AMMANNIA KOEHNE!I Britton, Bull. Torr. Club 18: 271. 1891. 
Abundant on the bottom lands of the Colorado river at Ft. 
Yuma, October 21, 1912, Parish 8324, and at Bard, a few miles 
above. 
AMBROSIA ARTEMISIAEFOLIA L. Sp. Pl. 988. 1753. 
Riverside, growing on soil in which plants brought from 
Chico, California, had been packed. F. WZ Reed rrgo. Casual 
here, and not mentioned in Jepson’s Flora of Western Middle 
California, but it is a weed to be expected in the state. 
XANTHIUM STRUMARIUM L. Sp. Pl. 987. 1753. 
Common in cultivated fields, and in waste places, in the 
bottom lands of the Colorado river at Ft. Yuma, October 21, 
1912, Parish 8 360. 
XANTHIUM COMMUNE Britton, Manual 912. Igol. 
With the above species and equally abundant. Parzsh 8359. 
The first of the above xanthiums is reported in the Botany 
of California, but in recent works X. canadense is the only 
smooth stemmed cocklebur mentioned, and this is the only spe- 
cies as yet detected in southern California. 
San Bernardino, California. 
