Herbarium catalogue

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L. The corolla shape, funneleshsped rather than shaped, cut s it out from all the species of the series except > ih aes << a f£ * 2 = th. giganteum and Rn. protistum. > ft 9 cheracters giganteum and the flc wii venation an Lo 2 Ne 4 SU ry Py & Uille to tawny and seminudum t + ony D “< These two are very. = an relate they ar LC te: would appear to be ae irker ie colour than Rh. protistu wwers slightly larger. is Line eaf you sent has ibe indumentum (es our Rh. pro chief differences are in the leaf Ue Ps ty i om oO ate pet @ fond n , rh A + he a 2 Sn <3 ¥ : d the leaf indumentum. Leaf shape and size. orotistum are length than those of Rh. giganteum. I give the ne i nonimance D Aris Satan on m sX m - nany specimens :- Rh. protistum, 20 cm. y CMe U 21 em; Rh. giganteum, 12 cm. by 4 cm. up to 57 cms Your leaf sent to me is about 30 cm. By 18 cm. thus srotistum indumentum of Rh. crotistum is developed only ae Bose our type - is whitish end not _— same as the in per nteum nor is = the same as the tinal cae sae ae eveloned over the whole of the leaf underside - not tistum e entum copyright reserved

i not confined to marginal area w CGC. The leaf venation of your plant is nearer to our plants of Rh. protistum than to the leaf venation of typical Rh. giganteum. 4. Geographical distribution. The gatherings of Rh. protistum come from areas further north than those of Rh. giganteum, but in approximately the same line of longitude. Thes north gatherings by Forrest of Rh. protistum in the Mekong-- Salwin are I should think, nearer to your 1971 area than his gatherings of Rh. gigsnteum on the N'iaikna--Salwin divide, Leta 26-15. a @ The conclusion I have come to are :- 1. That your plant may be a form of Rh. protistum with the indumentum fully developed all over the leaf undersurfac and not as in Forrest's gatherings confined to the leaf margin. 3c Zz See enclosed specimens Forrest 18395 and 18545 and compare these with typical Rh. giganteum, Forrest 19355, 18458 and the seminudum var. Forrest 26311 A. 5 2. An alternetive suggestion is that you have got something new. A species with the leaf of the Rh. sinogrande type and the flowers of a protistum. The leaf you send is typical Rh. sinogrand (see your earlier gathering K.W. 8130, from Delei Valley). If you had sent me the leaf only I would have said without hesitation Rh. sinogrande but the flowers are undoubtedly of the giganteum—-protistum type- not the sinogrande type with its oblique calyx and big anterior belly. I am wondering if in packing these to send to me a sinogrande leaf has been sent with flowers akin to Kh. protistum. The leaf you send as K.W. 9200 is almost a perfect match of your 8130 but the flowers of 9200 are different. In order that you may follow my reasoning I am sending you the following svecimens:s- 1. Typical giganteum, F. 18458. re 22 ,? F 1g 3 ar. séminudum, F. nal indumentup. 1A. Note identical venation but 4 4. A bit of Rh. protistum, F. 18548. Indumentum thin but the wenation nearer Rh. protistum than Rh. giganteun. 5. Rh. protistum, F. 18393. Indumentum thin but of the Rh. protistum type. I am also returnéng to you the leaf of 9200 which you sent o that you may compare it with your 8150. ta Il was much interested to hear of your queer Glaucum and shall look forward to seeing it. The Professor asks me to say that if you think we have anything at Edinburgh that you would like to see for comparison with any of your 1931 collection, we would be very pleased to send them on to you. ie had Taylor here for the Easter week-end. He was in good form but wouldn't look at Rhododendrons. He was quite right, he was on holiday. X Yours sincerely, ROYAL 5 6 vA 8 9 10 Cy eae ae]