1916-17.] BOTANICAL SOCIETY OF EDINBURGH 217 



marks Rh. irroratum, but the oblanceolate form of the 

 leaf is much more marked liere and the tip is more 

 definitely beaked or shortly acuminate. Then the flowers 

 are red not white or yellow- white tinged with rose as in 

 Rh. irroratum, the inflorescence rhachis is glabrous not 

 glandular, the pedicels are under not over 1 cm. long, the 

 calyx is glabrous or sparinglj^ floccose not glandular, the 

 campanulate corolla (not tubular-campanulate) has no 

 glands on the outside and is glabrous not hairy inside, the 

 staminal filaments are glabrous not finely puberulous at 

 base, the ovary is very sparingly floccose not densely 

 glandular, and the style is glabrous not glandular. 



The relationship to Rh. gyinnanthunn is closer than to 

 Rh. irroratuin, and the species is a distinct member of 

 that set within the Irroratum series which are grouped 

 under Gymnanthum. See p. 171, where diagnostic char- 

 acters are given. 



Rliododendron tanastylum, Balf. f. et Ward.^ 



A medium-sized scraggy bush or more generally a thin 

 tree of about 6 m. in height living well inside the rain- 



1 Rhododendron tanastylum, Balf. f. et Ward. — Arbor tennis ad 6 m. 

 alta vel frntex macer, silvarnni plnvialiuni incola, ramis tennibns. 

 Ramnli annotini circ. 1"5 mm. diam. jailis tloccosis albidis plus minnsve 

 indnti glabrescentes tandem rubro-purpurei punctnlati dein sordidegrisei 

 decorticantes. Alabastra matnra folioruni ignota. Folia petiolata ad 

 13"5 cm. longa ; lamina chartacea late lanceolata vel oblanceolata ad 

 12 cm. longa ad 4"3 cm. lata apice attenuala nunc breviter subacuminata 

 nunc obtu^^a subrostrata tuberculo corneo parvo terminata margine 

 cartilaginea recurvata undnlata cicatricibus obscure subasperata basi 

 obtusa vel subcuneata supia olivacea vel brunneo-olivacea opaca 

 costa media sulcata sulco pilorum vestigiis plus minusve praedito veni? 

 primariis utrinsecus circ. 16 et venularum reti incon.spicuis caeteroquin 

 laevis glabra "sed Hoccorum juvenilium vestigiis obscure notata, subtus 

 pallidior saej^e fulva subnitens costa media erubescente et venis primariis 

 elevatis pedibus rubris tioccorum (an glandularum ?) detersorum punctu- 

 latis caeteroquin glabra; petiolus ad TS cm. longus saepius brevior 

 crassus rubro-purpureus supra sulcatus plus minusve Hoccosus sed 

 glabrescens. Flores racemoso-umbellati circ. 8 in quaque intlorescentia 

 rliachi tenui ad 2 cm. longa t'urfuracea ; bracteae deciduae ignotae ; 

 bracteolae filiformes rufescentes circ. 8 mm. longae pedicellis breviores 

 sericeo-pilcsae ; pedicelli ad 1 cm. longi validi atro-purpurei pilis 

 floccosis brevibus sparsissime conspersi vel glabri. Calyx minutus 

 cupularis carnosiilus circ. 2 mm. longus cupula glabra, lobis 5 late ovatis 

 extus glabris margine pilis sebaceis sparsim ciliatis. Corolla intense 

 kermesina tubuloso-campanulata ad 4'5 cm. longa 5-gibbosa retusa extus 

 eglandulosa epilosa intus glabra et postice varo maculisque pluribus 

 notata .5-lobata, loljis rotundatis emarginatis subcrenulatis circ. 1*7 cm. 



