1916-17.] BOTANICAL SOCIETY OF EDINBURGH 165 



{Rh. anthosphaerum, Rh. hylothrejptwm, Rh. pogonostyluon) ; 

 gland-setose {Rh. mengtszense) and the degrees of persist- 

 ence of the several indumenta is also somewhat variable. 



The series includes Rhododendrons with very small calyx 

 — cup-shaped and fleshy with almost obsolete lobes — and 

 it is glandular {Rli. agasturn, Rh. irroratum) ; glandular 

 and floccose {Rh. antJiosphaerum, Rh. pogonostylum) ; 

 glandular and puberulous {Rh. adenostemonum, Rh. hylo- 

 threptum) ; puberulous {Rli. ceraceum) ; gland-setose {Rh. 

 mengtszense) ; glabrous and flock-fringed {Rh. araio- 

 phyllum, Rh. eritimum, Rh. gymnanthuni, Rh. tana- 

 sty luni) ; glabrous (Rh. lukiangense, Rh. spanotrichum). 



In the matter of the corolla, which is most commonly 

 tubular-campanulate ■ — openh' campanulate {Rli. araio- 

 phyllum, Rh. mengtszense, and perhaps, Rh. spanotrichum) 

 and funnel-campanulate (Rh. adenostemonum and Rh. 

 gymnantJiU7n) — much variation in size is sometimes shown 

 within one species. For instance, in Rh. irroratum it may 

 be 4 cm. long or as much as 5"5 cm. The bottom of the 

 tube is always gibbous and retuse. The size of the lobes 

 varies with their number. Five lobes seem to be typical 

 of the Irroratum series, but departures from this number 

 are found in Rli. anthosphaerum (5-6), Rh. agasturn (5-7), 

 Rh. eritimum and Rh. hylothreptttm (7), and in the 

 5-lobed forms the lobes seem to be larger than in the 

 others. It is evident that a small series of dried specimens 

 is inadequate for the certain determination of: petal 

 numbers in forms showing fluctuations such as appear 

 in Rh. agasturn and RJt. anthosphaerum, and counts 

 made in -many more specimens are required. Colour 

 character in the corolla divides the series in two. In 

 most of the species it is some shade of red, often dai'k, in 

 three species {Rh. adenostemonum, Rh. araiophyllum, Rh. 

 irroratum) it is white sometimes suflused pink on the 

 outside, in Rh. irroratum often pale yellowish or greenish 

 white, in Rh. pogonostylum pink. Blotching and spotting 

 are found, but dried material is not always a safe guide in 

 this character. So far as I am able to decide from our 

 material the distribution is : — no blotch and no spots (Rh. 

 ceraceum), blotch and spots (Rh. anthosphaerum, Rh. araio- 

 phylluvi, Rh. gymnanthum, Rh. hylothreptum, Rh. tana- 



