Knowlton hop-hornbeam revisited (Ostrya knowltonii Cov.)
Brian NJ and Spamer EE. 2000. Knowlton hop-hornbeam revisited (Ostrya knowltonii Cov.). Bartonia. (60):49-56
A basic principle of ecology is the concept of the "life zone." Based on the distribution of plant communities by altitude, life zones were first scientifically described by C. Hart Merriam (1890), from field studies in northern Arizona. Between the top of Humphreys Peak, in the San Francisco Peaks and the highest point in the state of Arizona (12,633 ft/3,851 m), and the bottom of the eastern part of the Grand Canyon (2,560 ft/780 mat the foot of Hance Trail, at the Colorado River), is a distance of just 50 miles (80 km); but the elevational difference is 10,000 feet (3,000 m). There, Merriam described seven life zones, ranging from alpine floral communities above timberline, to desert communities in the Little Colorado River valley and the Grand Canyon.
- Type
- Journal Article
- Authors
- Brian, Nancy; Spamer, Earle
- Units
- GRCA
- Keywords
- Knowlton hop hornbean, Ostrya knowltonii, Plant Studies, Threatened - endangered - sensitive plants, Trees