1916-17] BOTANICAL SOCIETY OF EDINBURGH 219 



tubular-cam panulate as much as 4*5 cm. long, at the base 

 5-gibbous and retuse, outside glaudless and hairless, inside 

 glabrous and marked on the back by a blotch and many 

 spots, 5-lobed ; lobes rounded emarginate subcrenulate 

 about 1'7 cm. long and 2 cm. broad. Stamens 10 unequal 

 the longer about 3 cm. long the shorter about 1'5 cm. long, 

 much shorter than the corolla and style ; anthers about 

 2'5 mm. long ; filaments scarcely widened at the base 

 glabrous. Disk glabrous. Gjmaeceum as much as 4*2 cm. 

 long very slightly shorter than the corolla ; ovary cylindric 

 about 7 mm. long blackening glabrous slightl}^ grooved 

 obscurely papillate and tuberculate : style glabrous long 

 far exceeding the stamens slightly expanding into the 

 purple lobulate stigma. 



E. Upper Burma :— Hpimaw. 9000-10,000 ft. Medium- 

 sized scraggy bush or more generally thin tree of 20 ft., 

 well inside rain-forest. Flowers crimson. F. Kingdon 

 Ward. No. 1566. 19.5.14. 



This species is the only one known outside Yunnan of 

 the Irroratum series, and it is most like Rh. araiophylluin, 

 Ball f. et W. W. Sm. of the Shweli-Salween divide — the 

 species of the series nearest to it geographically. With 

 Rh. araiopliyllum it differs from some others of the 

 Irroratum series in its very thin twigs, in the general 

 absence of glands, and in the smaller flower-truss with 

 thin axis. It is readily told from Rh. araiophyllum, the 

 under-leaf surface in which is not punctulate and which 

 has also longer pedicels, a hairy rhachis to the inflorescence, 

 an openly campanulate smaller white corolla, pubescent 

 staminal filaments, a puberulous ovary, and a style hardly 

 longer than the stamens. 



Our species falls, as I have pointed out above (see p. 171) 

 into the set of Gymnanthum. When describing Rh. 

 araiopliyllum (see p. 186), I said that its relationships to 

 Rh. gymnanthum, Diels must not be overlooked. The 

 relationships of Rh. tanastylum to RJt. gymnanthu'm are 

 nearer, yet the two plants are not the same species. Foliage 

 and habit characters distinguish them at once. If we knew 

 enough we might be able to correlate these with habitats 

 — Rh. gymnanthum a plant of " open rocky situations," 

 Rli. tanastylum from " well within the rain forest." In 



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