E. V. Wulff — 1 14 — Historical Plant Geography 



recent, extensive development of ways of communication and the con- 

 stant movement of people and freight from region to region, as well as 

 the expansion of the cultivated areas and the introduction into culti- 

 vation of plants from distant countries, have enabled man to assume 

 such an important role in the geographical distribution of plants. It is 

 entirely clear that his significance in bygone centuries becomes less and 

 less. Consequently, there can be no doubt that for an explanation of 

 complex problems in historical plant geography, for an understanding 

 of the present areas of ancient species of the plant kingdom, and for the 

 solution of problems connected with discontinuous areas of plants, the 

 activity of man is a factor of altogether too recent date. In all those 

 cases where it can be established that any given changes in the charac- 

 ter of an area were induced by man's activity, their relatively recent 

 nature may be taken for granted. 



References: 



Allan, H. H., 1936: Indigene versus alien in the New Zealand plant world (Ecology, 

 Vol. 17, pp. 187-193). 



Allan, H. H., 1937: The origin and distribution of the naturalized plants of New 

 Zealand (Proc. Linn. Soc. London, Session 150, Pt. I, pp. 25-46). 



B,\TALiN, A., 1892: Das Perenniren des Roggens (.Vta Horti Petrop., Vol. 11, No 2). 



Braun-Blanquet, J., 1923: L'origine et le developpement des flores dans le massif 

 central de France (Paris). 



Cammerloher, H., 1927: Javanische Studien, I. Uber einige Falle von Unfruchtbar- 

 keit kultivierter Pflanzen fremder Florengebiete (Oest. Hot. Zeitschr., Vol. 86, No. i). 



DE Candolle, a., 1855: Geographic botanique raisonnee, Vol. II, Chap. 8 (Paris). 



Chernova, N. M., 1939: Brief summary of experimental work with trees and shrubs 

 at the Nikita Botanical Gardens (In Russian; Bull. Nik. Bot. Gard., Vol. 22, No. i). 



Cockayne, L., Simpson, G., and Thomson, J. Scott, 1932: Some New Zealand 

 indigenous-induced weeds and indigenous-induced modified and mi.xed plant-communities 

 (Journ. Linn. Soc, Bot., Vol. 49, pp. 13-45)- 



Flahault, M., 1899: La naturalisation et les plantes naturaUsfies en France (Bull. 

 Soc. Bot. de France, 3 ser., Vol. 6). 



Hildebrand, Fr., 1873: Die Verbreitungsmittel d. Pflanzen (Leipzig). 



KoROLEVA, A., 1930: Survey of literature on the blue cornflower, Centaurea cyanus L. 

 (In Russian; Bull. Appl. Bot., Gen., and Plantbr., Vol. 22, No. 5). 



Kupffer, K., 1925: Grundziige der Pflanzengeographie des Ostbaltischen Gebietes 

 (Abh. d. Herder Inst, zu Riga, Vol. i, No. 6). 



Maleyev, V. P., 1933: Theoretical bases of acclimatization (In Russian, EngUsh 

 summary; Bull. Appl. Bot., Gen. and Plantbr., Suppl. 60). 



Maltsev, a. I., 1926: Weeds of the U.S.S.R. and their Control (In Russian; Leningrad). 



Maltsev, a. L, 1929: Latest achievements in the study of weeds in the U.S.S.R. (/« 

 "Achievements and Prospects in the Field of Applied Botany"; in Russian; Leningrad). 



Pachosky, I., 191 1 : On the Field Weeds of Kherson Province (In Russian; Kherson). 



Perrier de la Bathie, H., 1932: Les plantes introduites k Madagascar (Rev. Bot. 

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RiKLi, M., 1902: Antropochoren und der Formenkreis des Nasturtium palustre (Ber. 

 Schweiz. Bot. Ges., Vol. 13). 



Stankov, S., r925: On some characteristic cultivated and naturalized plants of the 

 southern coast of the Crimea (In Russian, English summary; Bull. Appl. Bot., Gen., and 

 Plantbr. Vol. 14, No. 4). 



Thellung, A., 191 2: La flore adventice de Montpellier (Mitteil. d. Bot. Mus. Zurich, 



Vol. 58). 



Thellung, A., 1915: Pflanzenwanderungen unter dem Einfluss des Menschen (Bericht 

 d. Vereinig. fiir Pflanzengeographie). 



Thellung, A., 1930: Die Entstehung der Kulturpflanzen (Munchen). 



Willis, J., 1922: Age and Area, Chap. IV. Acclimatisation (Cambridge). 



Wulff, E., 1925: Contribution to the history of the experimental work conducted at 

 the Nikita Botanical Garden during the period 1813-1860 (In Russian; Bull. Nik. Bot. 

 Gard., Vol. 8). 



Wulff, E., 1926: Der Nikitsky Botanische Garten in der Krim (Mitteil. d. Deutsch. 

 Dendrol. Gesellschaft, Vol. 37). 



ZiNGER, N., 1909: On species of Camelina and Spergula infesting flax and their origin 

 (In Russian; Bull. Bot. Museum Acad. Sci., Vol. 6). 



