Biological Relations of Certain Cacti
Cannon WA. 1906. Biological Relations of Certain Cacti. The American Naturalist. 40(469):27-47
The leading points in this paper and the conclusions may be briefly stated in the following summary.; 1. The root systems of Cereus giganteus and of Echinocaclus wislizeni which were studied and mapped, present characteristic differences.; 2. The striking disproporation between absorption and transpiration, which was observed in Opuntia versicolor, is thought to be of great importance in accounting for the distribution of the plant (and perhaps of the family) in those parts where evaporation greatly exceeds precipitation..; 3. A low rate of transpiration was demonstrated in Opuntia versicolor and Echinocactus wislizeni during periods of prolonged drought.; 4. A direct relation was observed between structure and transpiration.; 5. The leaves of Opuntia versicolor play an important role in transpiration.
- Type
- Journal Article
- Authors
- Cannon, W
- Units
- ORPI
- Keywords
- Cacti