b 



1877.] Knowledge of the Burmese Flora. 185 



O Flower-heads clustered in the axils of the upper 

 leaves and passing more or less gradually into a con- 

 tracted spike-like panicle, or crowded in a dense termi- 

 nal spike, or the sessile clusters remote and in simple 

 or panicled slender spikes. 



A Eeceptacle hairy. Flower-heads sessile, clustered, 

 or rarely solitary simple or panicled spikes. 

 Erect, simple or branched annual, slightly or rarely densely pubescent or pilose, the 

 cauline leaves narrow and simple ; flower-heads about 3 lin. long, often pilose or 



almost woolly, B. Jistulosa. 



A A Eeceptacle glabrous. Flower-heads more or less 

 peduncled to almost sessile, clustered in the leaf- 

 axils and forming leafy or leafless contracted 

 spike-like panicles or spikes (rarely the panicle 

 developed). 

 Erect slender annual, long silky-pilose, the leaves all cuneate- oblong to linear ; flower- 

 heads silky-pilose, nearly 4 lin. long, on longer or shorter slender peduncles or 

 almost sessile, clustered in the upper leaf-axils and passing into a leafy spike-like 



contracted panicle , B. barbata. 



Erect robust annual, villous to silky pubescent, the lower stem-leaves more or less 

 spatulate-oblong or linear ; flower-heads \ — \ in. long, on short, thick, wooUy- 

 tomentose peduncles or almost sessile, forming dense spikes or spike-like (rarely 

 lax) panicles often accompanied by clusters of flower-heads in the upper leaf-axils, 



. . B. hieracifolia. 

 t t Erect or scandent shrubs or under-shrubs, or tall shrub- 

 like biennials. 

 Erect. 



A Peduncles thick and short, densely tomentose. 

 Leaves more or less villous or tomentose, especially 

 beneath. Eeceptacle more or less hairy. 

 Leaves pubescent, especially beneath, decurrent and entire at the base ; flower-heads 4 

 lin long,- the involucral bracts narrow, almost glabrous ; pappus rufescent , recep- 

 tacle shortly pilose, B. macrophylla. 



As preceding, but flower-heads larger, the involucral bracts densely pubescent, pappus 



white, B.procera. 



Leaves silky to silvery villous beneath, with one or two pairs of small dissevered 

 pinnae on the petiole ; flower-heads 4 lin. long, the involucral-bracts densely pubes- 

 cent; pappus rufescent ; receptacle almost glabrous, B. bulsamifera. 



A A Peduncles long and slender, puberulous to glan- 

 dular-pubescent. Leaves narrow. 

 Glandular-pubescent, especially the leaves beneath, the cauline leaves all sessile, membra- 

 nous ; flower-heads 4 — 5 lin. long ; receptacle glabrous, B. aromatica. 



Almost glabrous, or the thick almost coriaceous leaves beneath shortly hirsute, the 

 lower cauline leaves long-petioled ; flower-heads 4 — 5 lin. long ; receptacle densely 



silky pilose to glabrous, B. sessilifoUa. 



O Scandent shrub. Leaves almost coriaceous, simple. 

 Almost glabrous ; flower-heads 5 lin. long, in small axillary corymbs transforming into 



terminal pubescent panicles ; receptacle villous^ pappus white, B. riparia. 



* * Cauline leaves decurrent and forming entire or inter rupted-lacer ate leafy wings. 

 M 



