LITERATURE CITED
- Bews , J. W. 1912 . The Vegetation of Natal. Annals of Natal Museum , ii pt. 3.
- 1913 . An Ecological Survey of the Midlands of Natal, with special reference to the Pietermaritzburg district . Annals of Natal Museum , ii pt. 4.
- Coulter , Barnes and Cowles . Text-book of Botany , ii Ecology.
- Drude , O. 1890 . Handbuch der Pflanzengeographie.
- 1896 . —Deutschlands Pflanzengeographie.
- Haberlandt . 1909 . Physiologische Pflanzenanotomie.
- Humboldt , A. 1805 . Aspects of Nature. Eng. Ed., Lond 1849
- 1849 . 1806.—The Physiognomy of Plants. Eng. Ed., Lond.
- 1807.-Essai sur le geographie de plantes. Paris.
- Krause , E. H. L. 1891 . Die Eintheilung der Pflanzen nach ihrer Dauer. Ber. Deut. Bot., Ges. ix.
- Lothelier , A. 1890 . Influence de l'état hygrometrique de l'air sur la production des piquants. Bull. Soc. Bot. France , xxxvii
- 1891 . Influence de l'éelairement sur la production des piquants des plantes. Comptes Rendus. Paris, cxii.
- 1893 . Recherches sup les plantes à piquants. Rev. Gen. de Bot., v.
- 1812 . De l'influence de l'humidité de l'air sur le développement des épines de l'Ulex europaeus . Rev. gen. de Bot. , xxiv
- MacDougall , D. T. 1912 . The Water Balance of Desert Plants. Annals of Botany , xxvi c. i.
- Oliver , F. W. 1913 . Some Remarks on Blakeney Point, Norfolk. Journ. of Ecol. , i ( No. 1 )
- Ostenfeld , C. H. 1908 . The Land Vegetation of the Faroes.
- Paulsen , Ove. 1912 . Studies of the Vegetation of the Transcaspian Lowlands.
- Pound , R. and Clements , F. E. 1898 . The Phytogeography of Nebraska.—1898 . The Vegetation Regions of the Prairie Province. Bot. Gazette , xxv
- Raunkiaer , C. —Statistik der Lebensformen als Grundlage für die biologische Pflanzengeographie. Beih. Bot. Centralbl., 87, 1910
- Sim , T. R. 1907 . Forests and Forest Flora of the Colony of the Cape of Good Hope.
- Smith , W. G. 1913 . Raunkiaer's “Life-forms” . and Statistical Methods. Journ. of Ecol. , i ( No. 1 )
- Warming , E. 1909 . Oecology of Plants.
- Wood , J. M. —Natal Plants. Durhan
- 1907 . —Handbook to the Flora of Natal.
- Revised List of the Flora of Natal. Trans. of S. African Phil. Soc.