gathering the seeds for food, and as he passed through the lower San Joaquin 

 Valley he found "instead of grass, the whole surface of the country closely cov 

 ered with it." In 18S6 it was "common in New Mexico and throughout Sonora 

 and California ;"■'■' so that Thornber*'* is probably mistaken in dating its introduc- 

 tion into Arizona in 1870-71. It is widely scattered throughout the United States, 

 but apparently nowhere so abundant as on the Pacific coast, whence it was proba- 

 bly introduced elsewhere. 

 Pelargonium clandestinum L'Her. 



In a neglected lawn at Santa Ana, Nevin in 1904, the only reported collection. 

 Native of Europe. 

 Pelargonium zonale Willd. Scarlet Geranium. 



Fugitive in the hillside chaparral, Oceanside, in 1897. Native of South Africa. 

 Geranium pyreniacum L. 



A casual on the Vivian creek trail, San Gorgonio Mt., 7,000 ft. alt., G. Robertson 

 in 1905. The presence of this plant, so far from habitations or traveled roads, is 

 remarkable. The only other reported collections were made at Quebec and Bethle- 

 hem, Penn. Native of Europe. 



OXALIDACEAE 

 Oxalis corniculata L. 



A recent immigrant, now abundantly naturalized in lawns and parkings, both 

 the green-leaved and purple-leaved forms. San Bernardino, Parish in 1900. San 

 Diego, Hall in 1903. Santa Barbara, Eastwood in 1908. Probably at an earlier date 

 in central California. Native of Europe. 

 Tropaeolum majus L. Nasturtium. 



In common cultivation and occasionally escaping. Native of Peru. 



LINACEAE 

 Linum usitissimum L. Flax. 



Casual and infrequent. Redlands, in 1891. Los Angeles, Davidson in 1893. Not 

 cultivated in this region. Native of Europe. 



ZYGOPHYLLACEAE 

 Tribulus terrestris L. Puncture Weed. 



A recent introduction along the Southern Pacific Railway, now naturalized and 

 abundant along railroads and highways, but not confined to those habitats.- Rail- 

 way embankments. Port Los Angeles, Davidson in 1903. Railway yards, Colton, 

 abundant, Parish in 1908. Near the railway, San Bernardino, a single piatir, 

 W. G. Wright in 1908. Bakersfield, C. P. Fox in 1905, in which region it is now 

 "one of the two worst weeds."*" In the Colorado Desert, frequent along railways 

 and streets and in lawns. An obnoxious weed; when growing by roadways the 

 long stems extend over the track, and the abundant caltropiform fruits work into 

 the tires of bicycles, and even of automobiles, and cause punctures. Native of 

 Europe. 



RUTACEAE 

 Ruta chalapensis L. Rue. 



An escape or fugitive from Mexican gardens, where cultivated as a medicinal 

 herb. El Monte, Davidson in 1894; Mexican quarter, Ventura, Parish in 1918, and 

 Monterey in 1917. Native of tropical regions. 



SIMARUBACEAE 

 Ailanthus glandulosa Desf. Tree of Heaven. 



Occasional in waste places. Seldom cultivated. Native of China. 



EUPHORBIACEAE 

 Chamaesyce maculata Small. Milk Purslane. 



Street weed at Pasadena, "recently introduced." Grant in 1904. Native of 

 Europe. 

 Tithymalus Peplus Gaertn. Small Spurge. 



Recently introduced, but now naturalized and abundant in city lawns and 

 yards. San Bernardino, rare in 1895; San Diego, abundant in 1914. Native of 

 Europe. 

 Ricinus communis L. Castor-oil Plant. 



In waste places, often becoming a small tree, and sometimes forming small 

 groves. Its distribution and persistence are limited by its susceptibility to oc- 

 casional low temperautres, by which the plants are killed. Formerly occasionally 

 cultivated as a crop, and some forms are grown for ornament. Native of the 

 tropics. 



MALVACEAE 



Abutilon Theophrasti Medic. Velvet-leaf. 



A waif in an orange orchard at Riverside, Gordon Surr in 1917, the only re- 

 ported collection from the state. Native of India. 



"Torrey, J. Bot. Mex. Bound. Surv. 41. 1859. 

 ^^Thornber, J. Plant World 10:206. 1907. 

 "Bull. Cal. State Hort. Com. 6:431. 1917. 



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