I 



1877.] Knowledge of the Burmese Flora. 173 



* * Achencs not beaked. 



Prenanthes. Achencs almost terete or somewhat compressed, bluntish 3 — 5-cor- 

 nered, not or scarcely ribbed. Bristles of pappus more or less persistent. Florets 

 purple to white, never yellow. 



SoNCHUS. Achencs more or less compressed, ribbed. Bristles of pappus soft, 

 white, at base united into a ring and deciduous with it. Involucral bracts often incraa- 

 sate-dilated in fruit. Florets yellow. 



MiCRORHYNCHUS. Achcncs columnar, truncate at both ends, blxmtly 4 — 5-ribbed, 

 sometimes narrowly 2 — 3 -winged. Florets yellow. 



Xanthium, L. 



1. X. STETJMAEiTJM, L. sp. pi. 1400 DC. Pi'od. V. 524 ; Bth. Fl. 

 Hongk. 181 ; Clark. Comp. Ind. 132. (X Indicum, Eoxb. Fl. Lid. III. 

 601 ; DC. Prod. V. 523 ; Wight Icon. t. 1104 ; Griff. Not. Dicot. 232 ; 

 X BoxhurgUi, Wallr. Beitr. Dot. I. 233 ; Walp. Eep. VI. 151 ; X. disco- 

 lor, Wallr. 1. c. ; Walp. 1. c. ; X. hrevirostre, Wallr. 1. c. ; Walp. 1. c. ; X 

 inaequilaterum, DC. Prod. V. 523 ; Wallr. Beitr. Bot. 232 ; Walp. Kep. 

 VI. 151). 



Hab. Frequent in rubbishy or waste places, along river-banks, etc., 

 not only in the mixed forests, but more so in and around villages, all over 

 Burma from Chittagong and Ava down to Tenasserim. — Fl. Fr.. C. and 

 HS. 



Tridax, L. 



*1. T. PEOCUMBENS, L. sp. pi. ed. 1. 900 ; DC. Prod. V. 679 ; 

 Clark. Comp. Ind. 142. 



Hab. a weed like wild on old walls, in rubbishy places, etc., common 

 about Chittagong ; less so about Akyab in Arracan, and in Rangoon, and 

 probably around other seaports, but not yet spread over the country as in 

 India. — PL Fr. oo . 



Synedrella, Gsertn. 



*1. S. 'nodifloea, Gsertn. Fruct. II. 456. t. 171 ; DC. Prod. V. 

 629 ; Clark. Comp. Ind. 139. {Verlesina nodiflora, L. Amoen. IV. 290). 



Hab. Rubbishy places and neglected garden land in and around 

 villages, rather frequent about Akyab, Arracan ; Upper- Tenasserim, Moul- 

 mein (Dr. Stoliczka) ; on the Andamans now very common and penetrating 

 to the clearings in the jungles. — Fl. Oct. — March ; Fr. Febr. — May. 



Cosmos, Cav. 

 Conspectus of Species. 

 Florets all purple to rose-coloured ; achenes long and slenderly beaked, the beak termi- 

 nated by 2 stiff awn-like bristles, C. caiidatus. 



Florets all yellow ; achenes long but thickly beaked, the beak without pappus-bristles, 



. , C. sulfureus. 



