1907] HallCcmpositae of Southern California. 217 



less numerous and shorter lobes, and more scattered heads of 

 larger size. A form intermediate betwen this and the mainland 

 form comes from the Coronados Islands. 



4. A. biennis Willd., Phytogr. 11, no. 39 (1794). 



Erect, 4 to 8 dm. high, from an annual or biennial root : her- 

 bage glabrous, inodorous : leaves 3 to 8 or the lower even 12 cm. 

 long, bipinnately divided into lanceolate or broadly linear in- 

 cised or serrulate divisions, or the uppermost only pinnatifid to 

 nearly entire : heads erect, sessile, crowded on the short branch- 

 lets, forming a spike-like inflorescence, which is more or less 

 leafy : involucre hemispheric, about 2 mm. high : achenes with a 

 small epigynous disk. 



Sparingly introduced on low moist ground near Los Angeles 

 and Santa Ana ; to be expected elsewhere. Native of northwestern 

 America. 



5. A. Ludoviciana Nutt., Gen. ii. 143 (1818). 



Three to 10 dm. high : stems scarcely woody below, from run- 

 ning rootstocks, simple and erect, or with few virgate branches : 

 herbage whitened throughout with a lanate tomentum or the 

 upper surface of the leaves rarely somewhat glabrate: lower 

 leaves 4 to 6 cm. long, narrowly to broadly lanceolate, somewhat 

 dilated above and coarsely toothed, cleft, or parted into entire 

 acute lobes : upper leaves becoming narrow and entire, acute : 

 heads erect or horizontal, the dense spikes in a narrow compact 

 panicle the lower part of which is leafy-bracteate : involucre 

 hemispheric, 15 to 25-flowered, 3 to 4.5 mm. high. 



Western North America ; not common in our district : San 

 Bernardino Mts. at Bear Valley, etc., Blasdale, Parish, no. 1456, 

 Abrams, no. 2823, Grant, no. 6367 ; Santa Rosa Mts., Mrs. Trask. 

 nos. 85, 112, 138; Providence Mts., Brandegee (herbage only). 



In case A Ludoviciana Nutt., and A. gnaphalioides Nutt. 55 are 

 considered not distinct then, by the rule of priority of position, 

 the latter name has precedence. 



6. A. heterophylla Nutt., Trans. Am. Philos. Soc. ser. 2, vii. 

 400 (1841). A. Kennedyi A. Nelson, Proc. Biol. Soc. Wash, xviii. 



55 Nuttall, I.e. 



