|University of California, Berkeley|
|Jepson eFlora: Taxon page
Key to families | Table of families and genera
Index to accepted names and synonyms:
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|Family: Betulaceae||View Description||Dichotomous Key|
|Genus:||View Description||Dichotomous Key|
|Species:||View Description||Dichotomous Key|
Stem: trunk < 30 m; bark smooth or scaly, aromatic, often peeling in thin layers; twigs puberulent, glandular, or both; lenticels prominent; winter buds sessile, 3-scaled. Leaf: glandular-hairy; blade 2--5 cm, wide-elliptic, base +- truncate to tapered. Staminate Inflorescence: 2--7 cm; bracts each subtending 3 flowers, 3 bractlets. Pistillate Inflorescence: 2--3 cm; bracts each subtending 3 flowers, 3 bractlets. Staminate Flower: sepals 4; stamens 2. Pistillate Flower: sepals 0. Fruit: many, in a non-cone-like catkin, not enclosed by bract, winged; bracts lobed, papery, released with but not attached to fruit.
Species In Genus: 50 species: circumboreal. Etymology: (Latin: birch) Note: Important wildlife food; wood used for interior finishing; many species cultivated.
eFlora Treatment Author: John O. Sawyer, Jr.
Jepson Online Interchange
Key to BetulaPrevious taxon: Alnus viridis subsp. sinuata
Next taxon: Betula glandulosa
Citation for this treatment: John O. Sawyer, Jr. 2016. Betula, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=9114, accessed on December 09, 2016.
Citation for the whole project: Jepson Flora Project (eds.) 2016. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on December 09, 2016.