1923 J mm 



GREENMAN — SOUTH AMERICAN SENECIOS 77 



Venezuela: Paramo de Timotes, State of Tachira, alt. 3000- 

 3500 in., March, 1910, John 6 (U. S. Nat. Herb.); Paramo 

 Pieclras Blancas, alt. 4000 m., March 27, ,1915, Jahn 1>26 (U. S. 

 Nat. Herb.) ; Paramo de La Sal, Merida, alt. 3100 m., September, 

 1921, John 556 (U. S. Nat. Herb.) ; Paramo de Timotes, Merida, 

 alt. 3600 m., January 22, 1922, Jahn 789 (U. S. Nat. Herb.). 



This species is known in Venezuela under the common name 

 of "Romerito cenizo." 



Senecio arboreus Greenm., comb. nov. 



Cacalia arborea HBK. Nov. Gen. & Sp. 4:163, pi. 359. 1820. 

 Colombia : shrub zone, below Paramo del Chaquiro, Cordillera 

 Occidental, Department of Bolivar, alt. 2800-3100 m., February 



24, 1918, Pennell 4313 (N. Y. Bot. Gard. Herb 



aridus Greenm 



Plate 



Herbaceus perennis ubique floccoso-tomentosus ; caule erecto 

 vel suberecto circiter 3 dm. alto plus minusve glabrato; foliis al- 

 ternis inferioribus oblanceolatis 3.5-8 cm. longis 4-10 mm. latis 

 acutis vel obtusis calloso-denticulatis vel integris marginibus 

 revolutis juventate utrinque floccoso-tomentosis supra plus mi- 

 nusve glabratis, eis caulinis lanceolatis sessilibus et brevi-decur- 

 rentibus; inflorescentiis terminalibus paucicapitatis magnis ra- 

 diatis; involucris campanulatis calyculatis; involucri bracteis 

 21 lineari-lanceolatis circiter 13 mm. longis 2-3 mm. latis parce 

 tomentulosis ad apicem penicillatis ; floribus liguliferis 15-20, 

 ligulis late oblongis 13-15 mm. longis 5-7 mm. latis pallide flavi- 

 bus : floribus disci circiter 125 ; achaeniis glabris. 



Herbaceous perennial, floccose-tomentulose throughout; stem 



suberect, about 3 dm. high, more or less glabrate ; leaves 

 alternate, the lowermost oblanceolate, 3.5-8 cm. long, 4-10 mm. 

 broad, acute or obtuse, callous-denticulate, or entire, revolute- 

 margined, in the early stages floccose-tomentose on both sur- 

 faces, more or less glabrate above ; upper stem-leaves lanceolate, 

 sessile and short-decurrent ; inflorescence terminal, few-headed; 

 heads large, radiate; involucre campanulate, calyculate; bracts 



f 



about 13 mm. long, 2-3 mm 



broad, sparingly tomentulose, penicillate at the apex ; ray-flowers 

 15-20, rays broadly oblong, 13-15 mm. long, 5-7 mm. broad, light 

 yellow ; disk-flowers about 125 ; achenes glabrous. 



Colombia: dry open places, Paramo de Ruiz, Department of 

 Tolimo, alt. 3800-4300 m., December 16-17, 1917, Pennell 3037 

 (N. Y. Bot. Gard. Herb, and Mo. Bot. Gard. Herb.), type. 



