WILD FLOWERS OF CALIFORNIA 



75 



844. Bush-Hops 

 845. 



Hymenoclea Salsola 

 Hymenoclea monogyra 



846. Western Ragweed 



Ambrosia psilostachya 



Low much branched shrub- 

 by plants of arid deserts 

 with linear leaves and 

 with the general aspect of 

 sagebrush. Clusters of 

 flowers resembling hops 

 due to silvery wings of 

 the involucre. Southern 

 California, San Diego and 

 Santa Barbara eastward. 

 A coarse perennial weed, 

 sometimes very tall, with 

 divided and bristly leaves. 

 Creeping rootstocks which 

 make it difficult to eradi- 

 cate. Male flowers very 

 abundant in long racemes ; 

 fertile flowers forming 

 bur-like achenes. Common 

 in Bay region and interior 

 to Imperial Valley. Fol- 

 lows cultivation of lands. 



Ambrosia pumila Vicinity of San Diego only. 



Ambrosia artemisiifolia Introduced weed. 

 FRANSERIA 

 Perennial herbs or shrubs with parted or incised leaves, unattractive flowers 

 and fruit armed with prickles becoming a bur. 



849. Franseria tenuifolia 



850. Franseria acanthicarpa 



847. Dwarf Ragweed 



848. Common Ragweed 



851. 

 852. 



853. 



854. 



855. 

 856. 



857. Cocklebur 



858. Spiny Cocklebur 



858a. 



859. Broad Cocklebur 



Franseria bipinnatifida 

 Franseria chamissonis 



Franseria dumosa 



Franseria chenopodiifolia 



Franseria eriocentra 

 Franseria ilicifolia 



Xanthium Canadense 



Xanthium spinosum 



Xanthium commune 

 Xanthium strumarium 



Southern California. 



Sandy plains and in stubble. 

 Southern California and 

 along eastern side of Si- 

 erras to Oregon. 



Beach sands all along the 

 coast. 



Less common, seashore, 

 middle California north- 

 ward. 



Gravelly soils, a character- 

 istic species of southern 

 California deserts. 



Near Mexican border, San 

 Diego County. 



Mohave Desert. 

 Colorado Desert, Imperial 

 County. 



A common weed along 

 ditches and waste places. 

 Axils not spin)-, large 

 leaves. Burs troublesome 

 in wool of sheep. 



A pernicious weed. Leaves 

 lobed or cut and axils 

 bearing prominent yellow 

 spines. General through- 

 out cultivated areas. 



Bad weed in Imperial Val- 

 ley according to Parish. 



Bad weed from Eastern 

 States. Like 857. 



