20 6 
THE PLANT WORLD. 
A LIST OF THE MORE IMPORTANT PAPERS CITED. 
Areschoug, F. Der Einfluss des Klimas auf die Organisation der 
Pflanze, inbe'sondere auf die anatomische Struktur des Blattes. 
Bot. Jahr. 2. 1882. 
Barton, W. P. C. A flora of North America. Philadelphia. 1821. 
Beal, W. J. Michigan flora. Fifth report Mich. Acad. Sci. 1904. 
Brainerd, Jones and Eggleston. Flora of Vermont. Twentieth Ann. 
Agr. Rep. 1900. 
Bonnier, G. Quelques observations sur les relations entre la distri¬ 
bution des phanerogames et la nature chemique de sol. Bull. 
Soc. Bot. France, 24. 1879. 
Cultures experimentales dans le.s Alpes et les Pyrenees. Rev. 
Gen. Bot. 2. 1890. 
Britton, N. L. Flora of New Jersey. Rep. State Geologist, 2. 1889. 
Cesalpino, A. De plantis libri XVI. Florence. 1583. 
Chapman, A. W. Flora of the southern United States. New York. 
1883. 
Coulter, J. M. Manual of the flora of the Rocky Mountain region. 
New York. 1885. 
Manual of the plants of western Texas. Contr. U. S. Nat. Herb. 
2: 1. Washington. 1891. 
Coville, F. V. The botany of the Death Valley expedition. Contr. 
U. S. Nat. Herb. 4. 
Cowles, H. C. The ecological relations of the sand dunes of Lake 
Michigan. Bot. Gaz. 27. 1899. 
The physiographic ecology of Chicago and vicinity. Bot. Gaz. 31. 
1901. 
Darwin, C. The origin of species. 1859. 
On the fertilisation of orchids by insects. 1862. 
Insectivorous plants. 
The movements and habits of climbing plants. 1875. 
Cross and self fertilisation in the vegetable kingdom. 1876. 
Animals and plants under domestication. 
De Candolle, A. P. Prodromus systematis naturalis. Paris. 1824. 
Essai elementaire geographie bontanique. 1820. 
De Candolle, Alphonse. Geographie bontanique raisonee. Paris. 
1855- 
Drude, O. Die systematische and geographische Anordnung der 
Phanerogamen. Schenck’s Handbuch der Botanik. Breslau. 
1887. 
Handbuch der Pflanzengeographie. Stuttgart. 1890. 
Dudley, W. R. The Cayuga flora. Bull. Cornell Univ. (Science) 2: 1. 
1886. 
Engelmann, G. The genus Cuscuta. Amer. Jour. Sci. 1842. 
The Cactaceae of the United States. Proc. Amer. Acad. Arts 
and Sci. 1856. 
Notes on the genus Yucca. Trans. St. Louis Acad. Sci. 3. 1879. 
