1916-17.] BOTANICAL SOCIETY OF EDINBURGH 169 



4. Agastum type — plants with rigid, blunt leaves and red flowers — 

 includes : 



Rh. ayastum, Rh. eritimum. 



Irroratum. 



Here the foliage is rigid, thick, and coriaceous, the shape 

 of the leaf lanceolate or oblong lanceolate or ovate lanceo- 

 late, sometimes somewhat oblanceolate, with the marginal 

 undulation very distinct and the notching from the fallen 

 glands and flocks conspicuous. The stem and petioles 

 whilst glabrescent retain often the flocks and glands of 

 youth. This little group is markedly glandular, and the 

 punctulations caused by the fallen glands are easily seen. 

 Pedicels, calyx, ovary, style — all have glands sometimes 

 mixed with flocks. The corolla is glandular outside in 

 Rh. irroratuin, the stamens in Rh. adenostemonum ; in Rh. 

 pogonostylum there are glands outside the corolla, as in Rh. 

 irroratum, though fewer, and also a coating of hairs. The 

 flowers are white or yellowish-white, with a flush of rose, 

 or are pink, are in dense many-flowered raceme-umbels, 

 have 5 petaline lobes and 10 stamens. The species cover 

 the area from the north-west of Yunnan to the south-east. 



KEY TO THE SPECIES. 



Leaves rigid, thick, coriaceous, lanceolate oblanceolate or 

 ovate-lanceolate, base obtuse or rounded, 

 mat on both surfaces, margin conspicu- 

 ously undulate and notched. 

 Corolla 5-lobed, glabrous glandular or glandular and 

 puberulous outside, puberulous inside, 

 s|)Otted, not blotched. Stamens 10. Style 

 glandular or floccose and glandular. 

 Calyx glandular. Style glandular. 



Corolla white or cream or suffused rose. 



Ovary glandular. Pedicel 1 cm. or more 

 glandular. 

 Corolla tubular-campanulate glandular out- 

 side. Stamens finely puberulous at ba>e, 

 eglandular. Inflorescence rhachis gland- 

 ular. Petiole glandular and floccose 

 glabrescent .... irroratum 



Ovary glandular with some flocks. Pedicel 

 under 1 cm. glandular. 

 Corolla fuunel-campanulate glabrous out- 

 side. Stamens pubescent to middle and 

 beyond, glandular. Inflorescence rhachis 

 glandular and floccose (?). Petiole gland- 

 glabrescent .... adenostemonum 



