| Description | Parke, Davis & Company (London)
Parker, R N (Forest Research Institute and College, Dehra Dun, India)
Parsons, Miss C (Surrey, England)
Payne, F W (London)
Pennell, Francis W (Academy of Natural Sciences of Philadelphia, U.S.A.)
Petrak, Dr F (Mahr-Weisskirchen, Slovakia (Czech Republic)
Phillips, E Percy (Department of Agriculture, Pretoria, South Africa)
Pickard, Joseph F (Leeds)
Pillans, N S (Royal Botanic Gardens, Kew)
Piper, C V (United States Department of Agricuilture, Washington D.C.)
Sir Isaac Pitman & Sons Limited (London)
Poynton, W Ames (London)
Pollard, A (British Museum, London)
Poole, H F (Isle of Wight, England)
Preston, F G (Botanic Garden, Cambridge)
Priestman, L[?] D (West Yorkshire, England) |