A revision of the genus Pteroma (Compositae). '285 



Heads 2-2*5 cm. long, cylindric .... 40. cylindracea. 



Leaves 3-7 cm. long, sheathing at the base for about 



1 cm. . . . . . .41. Jlexicaulis. 



***Heads solitary at the end of each shoot. 

 fLeaves alternate. 



Leaves smooth, uot warted. 



Involucral bracts with long spiny tips. 



Branches white ; leaves club-shaped, small; 



heads 1— 1'5 cm. long ..... 42. leucoclada. 



Branches mostly not white ; leaves oblanceo- 

 late or obovate ; heads 2 2"5 cm. long. 

 Bracts not membranous-winged ; leaves 



1-2 cm. long ...... 43. acuminata. 



Bracts with very broad membranous wings; 



leaves about 5 mm. long . . . 44. scariota. 



Involucral bracts rounded at the apex <>v at most 

 acute, not spine-tipped. 

 Leaves flat. 



Involucral bracts acuminate, hardly ciliate . 45. aspalatlui. 

 Involucral bracts acute or subobtuse, filiate 46. glaucescens. 

 Leaves terete, trigonous or keeled. 



Bracts ciliate; Leaves - 7mm. long; heads 



Avell exserted from the leaves . . . 47. ciliata. 

 Bracts glabrous; leaves 7 13 mm. long; heads 



more or less enveloped by the leaves . 48. trigona. 

 Leaves very densely and coarsely warted . . 49. Bangei. 

 -j-fLeaves opposite. 



Leaves very densely and coarsely warted. 

 Leaves 2 :}•."> cm. long; branchlets not spinuloses 



bracts with jagged margins .... 50. tenuifolia. 



Leaves 0*6 1 cm. long; branchlets densely spinu- 



lose with the persistent leaf-connections . 51. spinulosa. 

 Leaves - 5 1*5 cm. long; branchlets hardly 



spinuloses bracts entire . • • -52. succul> nta. 



Leaves smooth. 



Leaves 3 7 cm. long, sheathing at the base for 



about 1 cm 41. flexicaulis. 



Leaves usually short ; sheaths nothing or very 

 short. 



Leaves acicular 18. camphor ata, 



Leaves not acicular. [var. laev 



Heads widely campanulate, about 1 cm.broad 

 at the base ; leaves Hat, l-2 - 5 em. long, 



2-5 6 mm. broad 513. glabr 



Heads turbinate at the base or constricted 

 in the middle; leaves usually much 

 shorter than in the preceding, if long 

 then narrower. 



