Tab. 8675. 

 RHODODENDRON monosematum. 



Western China, 



Ericaceae. Tribe Khodoreae. 

 Rhododendron, Linn. ; Benth. et Hook. f. Gen. Plant, vol. ii, p. 599. 



Rhododendron monosematum, Hutchinson ; species nova affinis H. paclnj- 

 tricho, Franch., sedrainulis et petiolis pilis rigidis apice glandulosis setosis, 

 foliorum costa infra glabra, ealyce extra glanduloso-piloso differt. 



Frutex ; ramuli hornotini purpurascentes, basin versus glabrescentes, superne 

 dense foliati et pilis longis glandulosis nigrescentibus dense induti. Folia 

 oblonga, basi inaequaliter rotundata, apice abrupte et subacute acuminata, 

 8-11 cm. longa, 2-3 ■ 5 cm. lata, acumine circiter - 5 cm. longo, rigide 

 coriacea, supra viridia et sicco arete impresse reticulata, infra pallidiora, 

 subtiliter reticulata, utrinque glabra ; nervi laterales utrinsecus circiter 15, 

 utrinque prominuli, intra marginem conjuncti et valde ramosi ; petioli 

 1*5 cm. longi, basin versus hispidi. Inftorescentia terruinalis, circiter 

 12-flora ; bracteae extra sericeae ; pedicelli 1 ' 5-2 cm. longi, pilis apice 

 nigro-glandulosis dense pubescentes. Calyx brevis, obscure 5-lobus, extra 

 glanduloso-pubescens, lobis ovato-triangularibus subobtusis glandulosis. 

 Corolla late infundibuliformis, albo-rosea, intra basin dorso maculo 

 circiter 6 mm. lato purpureo instructa, extra erubescens ; tubus 3 cm. 

 longus, apice circiter 2 cm. diametro, glaber ; lobi 5, patulo-recurvati, late 

 ovato-rotundati emarginati, 1-5-2 cm. lati. Stamina 10, inclusa; fila- 

 menta basin versus pubescentia, 2-2 '5 cm. longa; antherae parvae, atro- 

 purpureae, 2*25 mm. longae. Ovarium 6-loculare, pilis apice purpureo- 

 glandulosis longe stipitatis dense indutum ; stylus glaber, exsertus, fiavus, 

 circiter 3 cm. longus. — J. Hutchinson. 



The Rhododendron here described is closely related to 

 11. pac/ii/triehum, Franch., also from Western China, 

 already in cultivation in this country. The most striking 

 difference between the two is in the branchlets and the 

 leaf-stalks. In A\ pachytrichum the hairs on these and on 

 the midribs are short and copiously branched, and thus 

 impart a mossy appearance ; the calyx is moreover quite 

 glabrous. In R. monosematum the hairs on the twigs 

 and petioles are long and bristly, simple and gland- 

 tipped ; the midrib is glabrous or has but a few gland- 

 tipped hairs, while the calyx is densely glandular- 

 pubescent. The only locality in which the species here 

 figured appears to have been met with in the wild state 

 is Mt. Wu, in Szechuan. Here it was collected in July, 



September, 1916. 



