|University of California, Berkeley|
|Directory News Site Map Home|
|Jepson eFlora: Taxon page
Key to families | Table of families and genera
Indexes to all accepted names and synonyms:
| A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z |
Shrub, tree; monoecious. Stem: trunk < 35 m; bark smooth to scaly, peeling in thin layers or not, lenticels present or not. Leaf: simple, alternate, petioled, deciduous; stipules deciduous; blade ovate to elliptic, generally serrate, generally ± doubly so. Inflorescence: catkin, generally appearing before leaves, often clustered; bracts each subtending 2–3 flowers, 3–6 bractlets. Staminate inflorescence: pendent, ± elongate. Pistillate inflorescence: pendent or erect, developing variously in fruit (see key to genera). Staminate flower: sepals 0–4, minute; petals 0; stamens 1–10; pistil vestigial or 0. Pistillate flower: sepals 0–4; petals 0; stamens 0; pistil 1, ovary inferior or superior, chambers 2, each 1-ovuled by abortion, stigmas 2. Fruit: achene, nut, winged or not, subtended or enclosed by 1–2 bracts.
6 genera, 155 species: generally northern hemisphere; some cultivated. [Furlow 1997 FNANM 3:507–538] —Scientific Editor: Thomas J. Rosatti.
Key to Betulaceae
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.Key to Betula
50 species: circumboreal. (Latin: birch) Important wildlife food; wood used for interior finishing; many species cultivated.
Stem: trunks to 10 m; bark red-brown to black, not peeling; twigs with large resin glands, hairy. Leaf: petiole < 15 mm, hairy; blade 2–5 cm, wide-ovate, glands especially adaxially, base ± truncate to tapered. Pistillate inflorescence: 3–5 cm; bract fringed with hairs.
Streamsides, springs; 600–2900 m. Klamath Ranges, High Cascade Range, High Sierra Nevada, Great Basin Floristic Province, Desert Mountains; scattered in western North America. Apr–May [Online Interchange]
Previous taxon: Betula glandulosa
Next taxon: Corylus
Citation for the whole project: Jepson Flora Project (eds.) 2013. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on Sep 2 2015
Citation for this treatment: [Author of taxon treatment] 2013. Betula, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=15658, accessed on Sep 2 2015
Copyright © 2014 Regents of the University of California
We encourage links to these pages, but the content may not be downloaded for reposting, repackaging, redistributing, or sale in any form, without written permission from The Jepson Herbarium.
See CalPhotos for additional images
Jo-Ann Ordano © 2000 California Academy of Sciences
|Geographic subdivisions indicated for the distribution of Betula occidentalis|| Markers link to CCH specimen records. If the markers are obscured, reload the page [or change window size and reload]. Yellow markers indicate records that may provide evidence for eFlora range revision or may have georeferencing or identification issues.
READ ABOUT YELLOW FLAGS
(Note: any qualifiers in the taxon distribution description, such as 'northern', 'southern', 'adjacent' etc., are not reflected in the map above, and in some cases indication of a taxon in a subdivision is based on a single collection or author-verified occurence).
View elevation by latitude chart
| Data provided by the participants of the Consortium of California Herbaria.
View all CCH records
CCH collections by month