514 WILSON EXPEDITION TO CHINA 



cliffs, alt. 3000 m., October 1910 (No. 4262; bush 1-1.5 m. tall); Lifan 

 Ting, thickets, alt. 2500 m., November 1908 (No. 1320; bush 2.5 m. 

 tall); Tsaku-lao-ch'u-shin-kou, A. von Rosthorn (No. 2556); without 

 precise locality, A . von Rosthorn (Nos. 2 147, 2 146, 2545, 2 162) . S h e 11 s i : 

 Tai-pei-shan, 1910, W. Purdom (No. 2); Thui-kio-san, October 1897 

 and Si-ku-tzui-stan, 1895, G. Giraldi; various localities, Hugh Scallan. 

 Chili: Weichang, 1909, W. Purdom (Nos. 50, 55). 



This pretty and well-marked species although it has a remarkably wide dis- 

 tribution exhibits very little variation. With the number of specimens before 

 us we cannot separate R. Rosthornii Diels and R. Pritzelianum Diels as distinct 

 species or even as varieties. The slight differences in size of calyx-teeth and in 

 color of anthers are of no value. Specimens from northern Chili show these same 

 slight variations. 



Rhododendron longistylum Rehder & Wilson, n. sp. 



Frutex 0.5-2 m. altus ramis gracilibus; ramuli hornotini sparsissime 

 lepidoti, apicem versus puberuli, annotini flavido-fusci v. pallide pur- 

 pureo-fusci, vetustiores cinerascentes; gemmae ovoideae, perulis 

 apice obtusiusculis v. rotundatis mucronatis extus minute puberulis 

 sparse lepidotis ciliolatis. Folia coriacea, oblanceolata v. oblongo- 

 lanceolata, rarius elliptico-oblongis, acuta v. brevissime acuminata, 

 basi cuneata, 2.5-6 cm. longa et 1-2 cm. lata, supra luteo-viridia, 

 nitidula, leviter rugulosa, sparsissime lepidota v. glabra, subtus palli- 

 diora, sparse lepidota, costa media supra impressa subtus elevata, 

 nervis utrinsecus 6-10 supra leviter impressis indistinctis subtus obso- 

 letis; petioh 2-4 mm. longi, puberuli, interdum fere glabri, sparsissime 

 lepidoti. Flores 10-20 v. plures, umbellato-racemosi, rhachi circiter 

 1 cm. longa; pediceUi 8-15 mm. longi, sparse glanduloso-lepidoti; 

 calyx membranaceus, sparsissime lepidotus, lobis 5 interdum spar- 

 sissime longe ciliatis ovalibus circiter 2 mm. longis (in specimine 

 fructifero ad 5 mm. longis et oblongis); corolla (paucae defloratae 

 tantum visae) infundibuliformis, 1.3-1.5 longa ac lata, glabra, lobis 

 5 ovalibus 6-8 mm. longis obtusis; stamina 6-10, exserta, filamentis 

 1.5-2 cm. longis infra medium villosis, antheris ovoideis ochraceis; 

 ovarium ovoideum, lepidotum; stylus valde exsertus, 2.5-3 cm. 

 longus, graciUs, glaber, stigmate discoideo lobato. Capsula conica, 

 8-9 mm. longa et 5 mm. diam., apice truncata, lepidota, calyce per- 

 sistente suffulta; semina flavida, oblonga, 1-1.5 mm. longa, utrinque 

 breviter alata. 



Western Szech'uan: west and near Wen-ch'uan Hsien, thickets, 

 alt. 2300 m., July and October 1908 (No. 1204, type) ; same locahty, 



