5 
to colour standards, descriptions of Bougainvilleas are often of little value. 
This investigation has led to correspondence with several botanists and 
botanical institutions in other parts of the world, who have helped by sending 
specimens and descriptions of Bougainvilleas cultivated in their respective 
countries. It seems probable that the well known “Mrs. Butt” {often 
wrongly regarded as a variety of B. spectabilis ) is a distinct and undescribed 
species. 
Duplicate herbarium specimens were distributed as follows during the 
year : — 
The Herbarium, Buitenzorg, Java ... ... 659 
Royal Botanic Gardens, Kew ... ... 545 
Botanic Gardens, Berlin ... ... ... 439 
British Museum, Natural History ... ... 386 
Prof. Bartlett, Michigan, U.S.A. ... ... 306 
Dr. E. D. Merrill, Arnold Arboreutm, U.S.A. ... 306 
Royal Botanic Gardens, Calcutta ... ... 275 
Forest Research Institute, F.M.S. ... ... 267 
Bureau of Science, Manila ... ... 240 
Rijks Herbarium, Leiden, Holland ... ... 159 
Botanical Survey, Pretoria, S. Africa ... 136 
Dr. A. F. G. Kerr, England ... ... 28 
Total ... 3,746 
The following material was sent on loan for study by botanists 
preparing monographs or for other special purposes:'—■ 
Dr. Danser, Groningen, Holland (various families) 248 
Dr. H. J. Lam, Leiden, Holland (Convolvulacece 
etc.) ... ... ... ... 233 
Dr. van Steenis, Buitenzorg, Java {various 
families) ... ... ... ... 93 
Dr. Kukenthal, Germany ( Cyperacece ) ... 73 
Dr. A. F. G. Kerr (Siamese plants) ... ... 24 
Mr. Hatshushima, Japan (Buxus ) ... ... 16 
Forest Research Institute, F.M.S. ( Diptero - 
carpacecB etc.) ... ... ... 12 
G. H. Spare, Perak (Melastoma) ... ... 8 
C. E. Hubbard, Kew ( Cymbopogon ) ... ... 2 
Total ... 709 
The following duplicate specimens were received in exchange by the 
Singapore Herbarium : — 
Dr. E. D. Merrill, Arnold Arboretum, U.S.A. 2,057 
Lingnan University, Canton ... ... 1,035 
Museum d’Histoire Naturelle, Paris ... 283 
Conservator of Forests, B.N.B. (Bornean plants) 236 
Harvard University, U.S.A. ( Orchidacecc ) ... 210 
Bureau of Science, Manila ... ... 90 
Economic Botanist, Mandalay, Burma (grasses) ... 75 
Government Botanist, Brisbane, Australia (ferns) 65 
Royal Botanic Gardens, Kew (Bornean plants) ... 43 
Total ... 4,094 
4° 
