1877.] Knowledge of the Burmese Flora, 1G9 



* * Female florets if present ligulate. 



X Ligulate female florets not yellow (white or rose-coloured to purple). 

 + Pappus none or very short {Bellidece). 

 Myriactis. Involucre broad, the narrow bracts in few rows. Ligules in 2 or more 

 rows, small. Achenes not or very shortly beaked, oily. Pappus none. 



Rhynchospermum. Involucre -bracts in few rows, imbricate. Ligules in 2 or 

 more rows, short and broad. Achenes beaked. Pappus of a few very caducous bristles 

 or none. 



+ + Pappus of elongate bristles, rarely short and paleaceous or 

 awned {Heterochromce) . 

 t Pappus consisting of very short bristles, scales, or awns, or 

 absent in the ray-achenes. 

 BoLTONiA. Receptacle conical or convex. Bristles of pappus very short, almost 

 paleaceous, often accompanied by 2 — 4 awns not exceeding the achene. 



t t Pappus consisting of copious capillary bristles in a single 

 or more rows (rarely depauperate in the ray-aehencs). 

 |; Ligules usually rather broad or ample. 

 Callistbphus. Involucre hemispherical, the outer bracts leafy, the inner ones 

 membranously scarious. Achenes compressed. Outer bristles of pappus very short 

 and forming a small crown. 



Aster. Involucre bell-shaped or hemispherical, the bracts in many rows, not or 

 leafy appendaged, or squarrose, or with scarious margins, or herbaceous and in only 

 2 rows. Bristles of pappus in several to 2 rows, equal. Achenes usually much com- 

 pressed. 



% X Ligules usually numerous, in 2 or more rows, narrow 

 or almost filiform or minute. 

 Erigeron. Involucral bracts nearly in 2 rows, narrow, somewhat unequal. Achenes 

 compressed. Bristles of pappus in a single row, or with a few very short outer ones. 



X X Ligulate female florets (like the disk-florets) yellow. [Homochromce) . 

 SoLiDAGO. Ray-florets few. Involucre narrow, rather wide. Appendage of the 

 style-branches usually lanceolate. Achenes ' obovoid or oblong. Bristles of pappus 

 capillary, copious, somewhat unequal. Shrubs or undershrubs. 



Subtrib. 7. SENECIONIBE^. Flower-heads either heterogamous, with the 

 female florets ligulate or rarely filiform, or sometimes homogamous, with all the florets 

 hermaphrodite and tubular. Receptacle usually naked. Involucre-bracts usually in a 

 single row, vtdth or without outer small ones, rarely in several rows and imbricate. 

 Anthers obtuse or shortly 2-mucronate at the base. Style-branches of the hermaphro- 

 dites truncate and penicillate, or rarely with pubescent tips or appendages. Pappus 

 of capillary bristles. Leaves alternate. 



* Involucre wide, the bracts membranous or herbaceous, elongate or acuminate. 

 DoRONicuM. Flower-heads radiate. Involucre-bracts in 2 rows, equal, herba- 

 ceous, acuminate. Receptacle hemispherical. Herbs. 



* * Involucre-bracts narrow, stiff, usually ribbed or keeled. 



X Flower-heads heterogamous, discoid, the outer female florets filiform, 

 shorter than their style. 

 Erechthites. Involucre etc. oi Senecio. Female florets in 2 or more rows, the 

 outer ones filiform. Flower-heads usually narrow, corymbose. Herbs. 



X X Flower-heads radiate or homogamous. Bristles of pappus not 

 feathery. 

 22 



