1634 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM 



Arboreous; leaves lanceolate to elliptic-lanceolate, including the petiole 10 to 

 45 cm. long, 2 to 10 cm. broad, acuminate, acute, entire or remotely and incon- 

 spicuously callous-denticulate, gradually narrowed at the base into a petiole 

 2.5 to 12 cm. in length, glabrous on both surfaces, thickish, dark green or almost 

 black in the dried state, somewhat paler beneath, the midrib and lateral nerves 

 prominent on the under leaf surface but the veinlets indistinct; heads many, 

 small, 8 to 10 mm. high; involucral bracts 5, glabrous; ray flowers 2 or 3; disk 

 flowers 3 to 5; achenes glabrous. 



54. Senecio standleyi Greenm., sp. nov. 



Southwestern Mexico; type from Sierra Madre, Michoacdn or Guerrero, alt. 

 2,000 meters, 18 Feb., 1899, E. Langlasse 895 (Gray Herb, and U. S. Nat. Herb.). 



Arboreous, 4 to 5 meters high; stem above papillose-hirsute; leaves petiolate, 

 lanceolate to oblanceolate, including the petiole 8 to 16 cm. long, 2 to 3.5 cm. 

 broad, acuminate, acute, entire or inconspicuously callous-denticulate, gradually 

 narrowed at the base into a slender petiole 2 to 3 cm. long, glabrous on both 

 surfaces, strongly reticulate-veined; inflorescence many-headed; heads 8 to 

 10 mm. high, radiate; bracts of the involucre 5, glabrous; ray flowers 1 to 3; 

 rays yellow; disk flowers 4 to 6; achenes glabrous. 



55. Senecio cobanensis Coulter, Bot. Gaz. 16: 101. 1891. 



South Mexico and Guatemala; type from Cobdn, Depart. Alta Verapaz, 

 Guatemala. 



Shrub; stems erect, glabrous, leafy at the apex; leaves lanceolate to somewhat 

 oblanceolate, 10 to 12.5 cm. long, 1 to 3 cm. broad, acuminate, acute, remotely 

 callous-denticulate, glabrous on both surfaces, conspicuously reticulate-nerved; 

 heads about 1 cm. high, discoid; involucral bracts usually 5, oblong, 5 to 6 mm. 

 long, obtuse, glabrous, thickened at the base; disk flowers about 5; achenes 

 glabrous. 



56. Senecio andrieuxii DC. Prodr. 6: 430. 1837. 

 Senecio subverticillatus DC. Prodr. 6: 430. 1837. 

 Cineraria verticillata Mairet; DC. Prodr. 6: 430. 1837. 

 South Mexico; type from Toluca. 



Shrub; stem erect, glabrous; leaves petiolate, crowded at the apex of the stem, 

 lanceolate, including the petiole 15 to 30 cm. long, 2 to 5 cm. broad, acute, entire 

 or remotely and inconspicuously callous-denticulate, glabrous, thickish, not 

 strongly reticulate-veined, narrowed at the base into a petiole 2 to 6 cm. in 

 length; heads many, 8 to 10 mm. high, radiate; involucral bracts 8, glabrous; 

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



57. Senecio liebmannii Buchinger; Klatt, Leopoldina 24: 125. 1888. 

 South Mexico; type from Laguna. 



Shrub; stem glabrous below, densely ferruginous-tomentose toward the top; 

 leaves petiolate, lanceolate, including the petiole 6 to 10 cm. long, 1 to 1.5 cm. 

 broad, acute, remotely and somewhat sinuate-dentate, narrowed at the base 

 into a short petiole 0.5 to 1 cm. in length, strongly reticulate-nerved and glabrous 

 on both surfaces ; heads 8 to 10 mm. high, radiate; involucral bracts 8, glabrous; 

 ray flowers commonlj'^ 5; disk flowers about 8; achenes glabrous. 



58. Senecio praecox (Cav.) DC. Prodr. 6: 431.. 1837. 

 Cineraria praecox Cav. Icon. PI. 3: 23. pi. 244- 1794. 



Central Mexico; described originally from specimens grown at the Botanical 

 Garden of Madrid. 



Shrub, or small tree, 1.5 to 5 meters high; stems soft-woody or fleshy, terete, 

 glabrous throughout; leaves clustered at the apex of the stem, petiolate, pal- 

 mately veined, ovate in general outUne, 6 to 18 cm. long, two-thirds as broad, 

 cordate, 5 to 7-angulate-lobed with acuminate lobes, entire-margined, glabrous 



