60 ERYTHEA. 
Centaurea Melitensis, L. This promises in due time to 
become as injurious a weed as the hoarhound, by its forming 
dense and wide masses, to the total exclusion of every other 
plant. 
Bidens pilosa, L. A city weed, common along the road- 
sides, in ditches and moist ground. 
Xanthium Canadense, Mill., iscommon. X. spinosum, L., 
scarcely to be found outside the city limits. 
Cotula coronopifolia, L. Frequent in shallow pools and 
moist places. 
Sonchus oleraceus, L. When the State Survey volumes 
were published this plant was apparently unknown in the 
State. Now it is more common than S. asper, Vill., which is 
associated with it everywhere. 
Anthemis Cotula, L. Widely diffused and generally more 
abundant in the country than in the city. At Avalon, on 
Catalina Island, it covers quite a large area. 
Melampodium perfoliatum, HBK. In the orchards to the 
southeast of Los Angeles, and in Vernon district, it is fairly 
common, but very variable in size, sometimes only six inches 
in height, at other times six feet. 
Verbesina encelioides, B. & H. At El Monte some twelve 
miles from Los Angeles, it was found established years 
ago. At present it is quite common in some of the corn 
fields. Last season I found a few plants near the river; so 
that this Mexican species is gradually widening its range as 
a naturalized plant. 
Silybum Marianum, Gertn. This is another plant appar- 
ently more common at El Monte than elsewhere. Near 
Pasadena a few specimens are to be found, but in both 
places it is quite localized. 
Senecio vulgaris, L. Occasionally observed on waste 
grounds. 
Taraxacum Dens-leonis, Desf. Solitary plants may be 
frequently observed in the lawns, but show no disposition 
either to multiply or to extend their range. 
