Gardneriance. N. O. Compositse, 



TAB. CCXXXIX. 



Adenostemma triangulare. 



Caule erecto pubescenti-hirto, foliis petxolatis trilobo-triangu- 

 laribus grosse ineequaliter acutissime serratis laevibus, petiolo 

 superne alato, paniculae ramis elongatis glabriusculis, involucre 

 hemisphaerico truncate obtuse clentato, squamis fere ad apicem 

 concretis, corollas dentibus valde hirsutis, styli ramis brevibus, 

 acheniis grosse muricato-tuberculatis. 



Hab. Brazil. About Rio Janeiro. Lund. On a moist bank 



in the Organ Mountains, at an elevation of about 3800 feet 

 above the level of the sea. Mr Gardner (2d CoIL n. 503). 

 Although, at first sight, this very much resembles the A. Bra- 

 silinianum, it is truly and abundantly distinct. The leaves are 

 larger, smoother, with a tendency to be 3-lobed; the styles are 

 short; the tips of the corolla very hairy, and the achenia more 

 coarsely muricated or tuberculated ; but what distinguishes it 

 best, is the circumstance of the scales of the involucre being united 

 into one piece, an hemispherical cup, truncated, or at most only 

 shortly and bluntly toothed, at the margin. In these two species, 

 and probably in all, the corollas adhere together by their viscid 

 surface, so as to fall off in a mass from the achenia. 



Fig. 1. Involucre and flowers. /. 2. Single floret. /. 3. 

 Achenium : — magnified. 



