1624 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM 



Leaves lanceolate, gradually narrowed at the base. 

 Involucral bracts 5. 



Veins not strongly reticulate 53. S. uspantanensis. 



Veins strongly reticulate. 



Heads radiate; stems above papillose 54. S. standleyi. 



Heads discoid; stems above glabrous or ferruginous. 



55. S. cobanensis. 

 Involucral bracts 8. 



Stems above smooth 56. S. andrieuzii. 



Stems above pubescent 57. S. liebmannii. 



Leaves palmately veined. 



Leaves glabrous 58. S. praecox. 



Leaves arachnoid-tomentose beneath 59. S. velatus. 



VL STREPTOTHAMNL 

 A single species in Mexico 60. S. parasiticus. 



VIL CONVOLVULOIDEL 



Heads 1 to 1.5 cm. high; bracteoles squarrose 61. S. kermesinus. 



Heads 1.5 to 2 cm. high; bracteoles appressed 62. S. confusus. 



1. Senecio palmeri A. Gray, Proc. Amer. Acad. 11: 80. 1876. 

 Guadalupe Island, Baja California, whence the type. 



Suflfruticose, 1 meter or less high, persistently white-tomentose throughout; 

 leaves oblong-spathulate, 3 to 9 cm. long, obtuse, entire to sinuate-dentate, 

 narrowed at the base into a petiole; inflorescence a terminal, pedunculate, few to 

 several-headed, corymbose cyme; heads 10 to 14 mm. high, radiate; disk flowers 

 numerous; achenes sericeous-pubescent. 



2. Senecio lyoni A. Gray, Syn. Fl. ed. 2. 1^: 454. 1886. 

 Islands off Baja CaUfornia; type from San Clemente Island. 



Suffruticose; stems terete below, subangulate and striate above, persistently 

 tomentose in the leaf axils; leaves 3 to 13 cm. long, 1 to 6 cm. broad, bi-tri-pin- 

 natisect into linear obtuse divisions, glabrous above, tomentulose to nearly or 

 quite glabrous beneath; heads 10 to 12 mm. high, few, on long bracteate peduncles, 

 radiate; ray flowers 10 to 12; rays yellow; disk flowers numerous; achenes canes- 

 cent-pubescent. 



3. Senecio cedrosensis Greene, Bull. Calif. Acad. 1: 194. 1885. 

 Cedros Island, Baja California, whence the type. 



Suffruticose; stem below ligneous, covered with a grayish bark; branches 

 sparingly crisp-hirsute with jointed hairs; leaves bi-tri-pinnatisect, 2 to 7 cm. 

 long, 0.5 to 15 cm. broad, pinnately parted into short, irregularly dentate or 

 incised divisions; heads about 1 cm. high, radiate; disk flowers exceeding the 

 involucre; achenes canous-hirtellous. 



4. Senecio lemmoni A. Gray, Proc. Amer. Acad. 17: 220. 1882. 



Arizona and northern Baja California; type from Camp Lowell and Santa 

 Catalina Mountains, Arizona. 



Suffruticose, glabrous or nearly so; stem much branched, covered with a brown- 

 ish, more or less decidous cortex; leaves lanceolate, entire to irregularly and re- 

 motely salient-toothed, membranaceous, the lower narrowed into a petiole, the 

 upper sessile and auriculate-amplexicaul; heads 10 to 12 mm. high, radiate; ray 

 flowers about 12; rays yellow; disk flowers numerous, exceeding the involucre; 

 achenes hirtellous. 



