[Vol. 2 



580 ANNALS OF THE MISSOURI BOTANICAL GARDEN 



Surv. Canada Herb. 14882 and Kew Herb. 872, in part) ; 

 Painsec Junction, 8 Aug., 1901, Churchill (Gray Herb.). 



Massachusetts: along Boston and Albany Railroad, Sept., 

 1879, Boott (Gray Herb.); streets of Cambridge, 1 Sept., 

 1897, Robinson (Gray Herb.). 



Rhode Island: wharves at Providence, 4 Sept., 1874, 

 Con (i don (Gray Herb.) ; streets of Providence, coll. of 1876, 

 Bailey (Gray Herb, and Field Mus. Herb.) ; East Providence, 

 20 July, 1890, Collins (Mo. Bot. Gard. Herb.). 



Pennsylvania : on ballast, Girard Point, July, 1877, Martin- 

 dale (Gray Herb.) and Aug., 1877, Rothrock (Field Mus. 

 Herb.). Introduced from Europe. 



2. S. mohavensis Gray, Syn. Fl. N. Am. I 2 : 446. 1884, and 

 ed. 2, 454. 1886 ; Greenm. Monogr. Senecio, I. Teil, 23. 1901, 

 and in Engl. Bot. Jahrb. 32 : 19. 1902. Plate 17. 



Glabrous throughout; stems erect or nearly so, 1.5 to 4 

 dm. high, freely branching; leaves membranous, ovate to 

 oblong-ovate, 2 to 6 cm. long, 1 to 4 cm. broad, apiculate-acute, 

 irregularly toothed, or somewhat laciniate-dentate, the lower- 

 most narrowed into a petiolate base, those of the stem sessile 

 and amplexicaul; inflorescence a terminal corymbose cyme; 

 heads 1 cm. high on slender peduncles, discoid or with much 

 reduced ligulate flowers; involucre calyculate with few short 

 inconspicuous bracteoles, 18-20-flowered ; bracts of the in- 

 volucre about 13, linear, acute, slightly shorter than the 

 flowers of the disk ; achenes canescent pubescent. 



Distribution: southern California, Arizona, and northern 

 Mexico. 



Specimens examined: 



California: Pleasant Canon, Panamint Mountains, alt. 

 900 m., 10 May, 1906, Hall & Chandler 6910 (Mo. Bot. Gard. 

 Herb, and Field Mus. Herb.) ; Hall Canon, Panamint Moun- 

 tains, 18 April, 1891, Coville & Funston 697 (U. S. Nat. 

 Herb.) ; Panamint Valley, alt. 450 m., 5 May, 1897, Jones (Mo. 

 Bot. Gard. Herb.) ; Mohave region, April-May, 1884, Lemmon 

 3129 (Gray Herb.), type; Colorado Desert, April, 1889, C. R. 

 Orcutt (U. S. Nat. Herb, and Gray Herb.). 



