1628 CONTRIBUTIONS FEOM THE NATIONAL HERBARIUM 



20. Senecio hirsuticaulis Greenm. Monogr. Senecio 1: 26. 1901; Bot. Jahrb. 

 Engler. 32: 22. 1902; Field Mus. Bot. 2: 280. 1907. 



East central Mexico; type collected between San Luis Potosi and Tampico. 



Shrub; stem above and the branches, as well as the petioles, densely hirsute- 

 pubescent with spreading hairs; leaves petiolate, ovate-oblong to ovate-rotund, 

 5 to 12 cm. long, 3 to 9 cm. broad, acute at the apex, subangulately 5 to 7-lobed, 

 usually subcordate at the base, shghtly hirtellous above especially on the midrib 

 and lateral nerves, densely and permanently tomentose beneath; heads about 

 1 cm. high, radiate; bracts of the involucre usually 13, glabrous; ray flowers 

 mostly 8; disk flowers 20 to 25; achenes glabrous. 



21. Senecio aschenbornianus Schauer, Linnaea 20: 698. 1847. 

 South Mexico; type from the Valley of Toluca. 



Shrub 1 to nearly 3 meters high; stem below covered with a brownish bark, 

 the younger parts and the branches floccose-tomentulose but soon glabrate; 

 leaves petiolate, broadly oblong-ovate to ovate-rotund, 5 to 12 cm. long, 3.5 to 

 10 cm. broad, shallowly and subangulately 5 to 9-lobed, acute at the apex, 

 mucronate-denticulate, short-cordate to rounded at the base, at first tomentulose 

 above but soon glabrate, densely and persistently lanate-tomentose beneath; 

 heads about 8 mm. high, radiate; bracts of the involucre commonly 8, glabrous; 

 ray flowers 6 to 8; rays yellow; disk flowers about 12; achenes glabrous. 



22. Senecio roldana DC. Prodr. 6: 431. 1837. 



Roldana lohata Llav. & Lex. Nov. Veg. Descr. 2: 13. 1825. 



Senecio sublohatus DC. Prodr. 6: 310. 1837, nomen nudum. 



Cineraria angulata Alamdn; DC. Prodr. 6: 431. 1837. 



Cineraria lohata Mairet; DC. Prodr. 6: 431. 1837. 



Senecio schumannianus Schauer, Linnaea 20: 698. 1847. 



South Mexico. 



An erect branched shrub, 2 to 3 meters high, white-tomentose in the younger 

 parts; leaves petiolate, subpalmately nerved, subrotund to oblong-ovate, 5 to 

 22 cm. long, nearly or quite as broad, sinuate-angulate-lobed, obtuse or acute, 

 callous-denticulate, at first lightly floccose but soon glabrate above, densely and 

 persistent!}' lanate-tomentose beneath; petioles 0.5 to 13 cm. long; heads manj% 

 radiate; ray flowers usually 5; rays yellow; disk flowers 10 to 12; achenes glabrous. 



23. Senecio jaliscanus S. Wats. Proc. Amer. Acad. 26: 143. 1891. 

 Southwestern Mexico; type from Chapala Mountains, near Guadalajara, 



Jalisco. 



Stem 2 to 3 meters high, ligneous below, striate and woolly-tomentose above; 

 leaves petiolate, oblong-ovate, 5 to 20 cm. long, nearly or quite as broad, 5 to 

 7-angulate-lobed, cordate, subpalmately nerved, at first arachnoid-tomentulose 

 above but soon glabrate, permanently white-tomentose beneath; petioles 1 to 

 15 cm. long; heads about 12 mm. high, discoid, 15 to 20-flowered; achenes 

 glabrous. 



24. Senecio hartwegi Benth. PI. Hartw. 18. 1839. 

 West-central Mexico; type from Bolafios, Jalisco. 



Stem fruticose; branches, petioles, and lower leaf surface tomentose; leaves 

 petiolate, suborbicular, 3 to 9 cm. long, nearly or quite as broad, repand-angulate, 

 cordate, palmately 7 to 9-nerved, glabrous and strongly reticulate-nerved on the 

 upper surface; heads small, radiate; achenes puberulent. 



25. Senecio seemannii Schultz Bip. in Seem. Bot. Voy. Herald 311. 1856. 

 Southern Arizona and northern Mexico; type from the Sierra Madre, north- 

 western Mexico. 



Stem erect, 1 to 2 meters high, ligneous at the base, angulate-channeled and 

 more or less purplish-lineolate above, glabrous; leaves petiolate, orbicular-ovate, 

 4 to 24 cm. long, nearly or quite as broad, repand-angula,te-lobed, callous- 



