470 Small. — Pollen-presentation Mechanism in the Compositae. 
to economy of pollen, which is limited only by the biological necessity of 
providing sufficient pollen to ensure fertilization, is supported by evidence 
of correlative development of these appendages. 
2. Tables are given showing the relative frequency of occurrence of 
the different types of styles and stamens in the various tribes, and these 
tables are also used to show lines of development and specialization in the 
pollen-presentation mechanism. 
Literature cited. 
1. Bentham, G. : Notes on the Classification, History, and Geographical Distribution of Com¬ 
positae. Journ. Linn. Soc. (Bot.), vol. xiii, 1873 
2 . Bentham, G., and Hooker, J. D.: Genera Plantarum, vol. ii, Pt. I, London, 1874. 
3. Cassini, H.: Opuscules phytologiques. Paris, 1826. 
4. Col, M.: Quelques recherches stir l’Appareil secreteur des Composees. Journ. de Botanique, 
vol. iii, 1899. 
5 . Delpino, F.: Studi sopra un lignaggio anemofilo delle Composte. Firenze, 1871. 
6. Dufour, L.: Observations sur les afhnites et revolution des Chicoracees. Compt. Rend., 
vol. cxlv, 1907* 
7 . Farmer, J. B., and Digby, L.: On Dimensions of Chromosomes considered in Relation 
to Phytogeny. Phil. Trans. Roy. Soc., B., 205, 1914. 
8 . Hildebrand, F. : Beitrage zur vergleichenden Anatomie der Ambrosiaceen und Senecionideen. 
Marburg, 1887. 
9 . Hoch, F. : Vergleichende Untersuchungen fiber die Behaarung unserer Labiaten, Scrophularineen 
und Solaneen. Freiburg i. B., 1885. 
10 . Hoffmann, O. : Engler und Prantl’s Die natiirlichen Pflanzenfamilien, Teil IV, Abt. 5. 
Leipzig, 1897. 
11 . Lavialle, P. : Recherches sur le developpement de l’ovaire en fruit chez les Composees. Ann. 
d. Sci. nat., Bot., 9 e ser., t. xiv, 1912. 
12 . Lebard, P.: Remarques sur les affinites des principaux genres du groupe des Liguliflores. 
Compt. Rend., clvii, 1913. 
13 . Lessing, C. F. : Synopsis Generum Compositarum. Berolini, 1832. 
14 . Meek, C. F. U. : A Metrical Analysis of Chromosome Complexes. Phil. Trans. Roy. Soc., 
B., 203, 1913. 
15 . Nichols, M. A. : Achenial Hairs of Compositae. Bot. Gaz., vol. xviii, 1893. 
16 . Schmidt, C. : Vergleichende Untersuchungen fiber die Behaarung der Labiaten und Boragineen. 
Rybnik, 1888. 
17 . Schultz Bipontinus : Cassiniaceae. Flora, 1852, &c. 
18 . Small, J. : The Identification Value of Hairs. Pharm. Journ., Ser. iv, vol. xxxvi. 
19 . Small, J. K. : Flora of South-eastern United States. New York, 1903. 
20 . Vuillemin, P.: Tiges des Composees. Paris, 1884. 
21 . Wettstein, R. V. : Handbuch der systematischen Botanik. 1903. 
