STANDLEY TREES AND SHRUBS OF MEXICO 1631 



late, hirtellous-piiberulent above, subtomentose beneath; heads many, 8 to 9 mm. 

 high, radiate; invohicral bracts 8 to 9 mm. long; ray flowers 4 to 6; disk flowers 

 6 to 9; achenes glabrous. 



38. Senecio hypomalacus Greenm. Monogr. Senecio 1: 26. 1901; Bot. Jahrb. 

 Engler 32: 22. 1902; Ann. Mo. Bot. Gard. 1: 278. pi. 10. 1914. 



South Mexico; type from mountains of TeHxtlahuaca, Oaxaca. 



An erect -shrub; leaves petiolate, or the uppermost sessile, ovate-rotund to 

 ovate-oblong, palmately 3 to 5-nerved, distinctly 5 to 11-lobed, densely crisp- 

 hirtellous above, lanate-tomentose beneath, callous-denticulate, subcordate to 

 truncate at the base; petioles 6 cm. or less long; heads many, 10 to 12 mm. high, 

 radiate; disk flowers about 10, much longer than the involucre; achenes glabrous. 



39. Senecio langlassei Greenm. Monogr. Senecio 1: 26. 1901; Bot. Jahrb. 

 Engler 32: 22. 1902; Field Mus. Bot. 2: 283. 1907. 



South Mexico; type from the Sierra Madre, Michoacdn or Guerrero. 



Shrub 3 to 4 meters high; leaves petiolate, palmately nerved, ovate-rotund, 

 10 to 20 cm. long, equally broad, 7 to 13-lobed, granulose-hirtellous on the upper 

 surface, white-tomentose beneath as well as on the petioles, the margins denticu- 

 late; inflorescence a terminal many-headed paniculate cyme; heads 1 cm. or 

 less high, radiate; ray flowers 6 to 8; disk flowers 15 to 20; achenes glabrous. 



40. Senecio cristobalensis Greenm. Monogr. Senecio 1: 26. 1901; Bot. Jahrb. 

 Engler 32: 22. 1902; Bull. Herb. Boiss. II. 6: 867. 1906. 



South Mexico; type collected between San Crist6bal and Teopisca. 



Shrub; stems in the younger stages purplish and glandular-hirtellous; leaves 

 petiolate, palmately nerved, subrotund, 3 to 14 cm. long, quite as broad, 7 to 

 9-lobed, cordate, mucronate-denticulate, glandular-hirtellous above, paler and 

 crisp-hirtellous beneath; inflorescence a terminal many-headed paniculate cyme; 

 heads discoid; involucral bracts usually 8, glandular-hirtellous; disk flowers 

 10 to 12, much longer than the involucre; achenes glabrous. 



41. Senecio cordovensis Hemsl. Biol. Centr. Amer. Bot. 2: 238. 1881. 

 South Mexico; type collected near Cordoba, Veracruz. 



Stems more or less ligneous; leaves petiolate, suborbicular, peltate, 5 to 16 

 cm. in diameter, 9 to 11-lobed, remotely callous-denticulate, somewhat hirtellous 

 above, tomentulose beneath; petioles 3 to 10 cm. long; inflorescence a terminal 

 many-headed paniculate cyme; heads about 1 cm. high, radiate; ray flowers 3 to 

 5, inconspicuous; rays much reduced and more or less irregular; disk flowers 

 8 to 10; achenes glabrous. 



42. Senecio macrobotrys Hemsl. Biol. Centr. Amer. Bot. 2: 243. 1881. 

 South Mexico; type from Orizaba, Veracruz. 



Scandent shrub (?); stems above terete, purplish, ferruginous-puberulent; 

 lower stem leaves petiolate, suborbicular, 10 to 30 cm. in diameter, excentrically 

 peltate, 9 to 11-lobed, callous-denticulate, somewhat hirtellous-puberulent above, 

 tomentulose beneath; petioles 3 to 12 cm. long; uppermost leaves sessile, oblong- 

 ovate; inflorescence a terminal, rather leafy, manj'-headed, paniculate cyme; 

 heads about 1 cm. high, subdiscoid; involucral bracts usually 8, glandular- 

 hirtellous; ray flowers 2 to 5, the corollas reduced to short filiform tubes; disk 

 flowers 7 to 11; achenes glabrous. 



This species may prove eventually to be conspecific with S. cordovensis. 



43. Senecio angulifolius DC. Prodr. 6: 431. 1837. 

 Senecio acerifolius K. Koch, Wochenschr. 237. 1861. 

 South Mexico. 



Shrubby plant, 1.5 to 3 meters high; stem soft-woody; leaves petiolate, or 

 the uppermost winged-petiolate to sessile, suborbicular, 6 to 15 cm. long, nearly 

 or quite as broad, 5 to 7-angulate lobed, cordate at the base, not infrequently 

 57020—26 ^21 



