United States
Department of
Agriculture
Forest Service
Rocky Mountain
Research Station
Ft. Collins, CO
General Technical Report
RMRS-GTR-118-CD
February 2004
| Authors |
| Acknowledgments |
| Introduction |
| Species description format |
| Trees |
| Shrubs |
| Ferns & Friends |
| Forbs |
| Graminoids |
| Descriptive drawings |
| Collecting and pressing methods |
| Glossary |
| References |
Key to Betula Species
1. Female catkins cone-like, persistent; pith triangular; twigs slightly angled .... Alnus conspectus1. Female catkins tassel-like, not persistent; pith compressed; twigs round, resin-dotted ... Betula conspectus (below)
Betula Conspectus
| Species | Form | Bark | Leaf shape | Leaf size | New twigs | Habitat |
|---|---|---|---|---|---|---|
| Betula glandulosa bog birch Begl |
shrub | not exfoliating; dark brown | crenate; rounded ovate | 3 cm (1 in) | resin dotted; grey; sticky | riparian or bogs |
| Betula occidentalis water birch Beoc |
tree | not exfoliating; reddish brown | serrate; broadly ovate; sticky | 5-8 cm (2-3 in) | resin dotted; green; sticky | riparian |
| Betula papyrifera paper birch Bepa |
tree | exfoliating; white-brown | double serrate; round ovate | 5-10 cm (2-4 in) | smooth; non-aromatic; glandular | upland |