m The person charging this material is re- sTX)nsible for its return to the hbrary from S it was withdrawn on or before the Latest Date stamped below. Theft, muf nation, and underlining of books are reasons for disciplinary action and may result in dismissal from the University. UN.VERS.TY OF ..n.n.S LIBRARY AT URBANA-CHAMPA.GS MAY 8JP^ FEB 1 2 1! IeB 1 1 1975 kc 4 n' L161 — O1096 Carnivorous Plants and "Th^ Man-Eating Tree'' ^v^ .N<\\0>'^'^ BY ^^ 0^"^"" SOPHIA PRIOR Botany Leaflet 23 FIELD MUSEUM OF NATURAL HISTORY / ^ CHICAGO 1939 The Botanical Leaflets of Field Museum are designed to give brief, non-technical accounts of various features of plant life, especially with reference to the botanical exhibits in Field Museum, and of the local flora of the Chicago region. LIST OF BOTANICAL LEAFLETS ISSUED TO DATE No. 1. Figs $ .10 No. 2. The Coco Palm 10 No. 3. Wheat .10 No. 4. Cacao 10 No. 5. A Fossil Flowrer 10 No. 6. The Cannon-ball Tree ^i. -10 No. 7. Spring Wild Flowers ' .25 No. 8. Spring and Early Summer Wild Flowers . . .25 No. 9. Summer Wild Flowers ; .25 No. 10. Autumn Flowers and Fruits 25 No. 11. Common Trees (second edition) 25 No. 12. Poison Ivy (second edition) 15 No. 13. Sugar and Sugar-making 25 No. 14. Indian Corn 25 No. 15. Spices and Condiments (second edition) ... .25 No. 16. Fifty Common Plant Galls of the Chicago Area .25 No. 17. Common Weeds 25 No. 18. Common Mushrooms 50 No. 19. Old-Fashioned Garden Flowers 25 No. 20. House Plants 35 No. 21. Tea 25 No. 22. Coffee 25 No. 28. Carnivorous Plants and "The Man-Eating Tree" .25 CLIFFORD C. GREGG, Director FIELD MUSEUM OF NATURAL HISTORY CHICAGO, U. S. A. *^j' -s- IHE UBRARY OF THE r^^ WAR 8-1939 ^^ OHWERSnY OF ILUNOIS Field Museum of Natural History DEPARTMENT OF BOTANY Chicago, 1939 Leaflet Number 23 Copyright 1939 by Field Museum of Natural History CARNIVOROUS PLANTS AND "THE MAN-EATING TREE" The habit of capturing prey and of digesting animal tissue for food, is so commonly held to be a special attribute of predatory animals that it seems paradoxical to speak of carnivorous plants. There exist, however, a number of flowering plants that not only capture small animals, by passive or active means, but have the power of digesting and assimilating the organic food thus obtained. As to relationships, these plants do not constitute a single group but belong to various, in part unrelated, plant families, and thus exhibit several kinds of structural provision for - capturing prey. This prey generally consists of small , insects, but in some instances of other small animals — minute freshwater Crustacea, isopods, worms and various ^ aquatic larvae, and, it is said, even small vertebrates — captured either like flies on sticky fly paper, or by a trap , mechanism, or by drowning. /^^^^^==^ One of the minor types, the common butterwort ' (Pinguicula vulgaris), has a rosette of several small - r oblong leaves, about an inch and a half long, with a very *^ short stalk. When fully grown the leaves lie closely pressed to the soil, usually with numerous flies and insects