Jepson eFlora: Taxon page
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Betula glandulosa
DWARF RESIN BIRCH

Higher Taxonomy
Family: BetulaceaeView DescriptionDichotomous Key

Common Name: BIRCH FAMILY
Habit: 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.
Genera In Family: 6 genera, 155 species: generally northern hemisphere; some cultivated.
eFlora Treatment Author: John O. Sawyer, Jr.
Scientific Editor: Thomas J. Rosatti.
Genus: BetulaView DescriptionDichotomous Key

Common Name: BIRCH
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.

Betula glandulosa Michx.
NATIVE
Habit: Shrub. Stem: trunks < 2 m; bark brown to gray, not peeling; twigs waxy-gray, with resin glands. Leaf: petiole < 6 mm, hairy; blade 1--2 cm, elliptic to wide-ovate, glands on both surfaces, base tapered. Pistillate Inflorescence: 1--3 cm; bracts resin-dotted. Chromosomes: 2n=28.
Ecology: Streams, meadow edges; Elevation: 1300--2300 m. Bioregional Distribution: CaRH, Wrn; Distribution Outside California: to Alaska, eastern North America. Flowering Time: May--Jun Note: Furlow reports Betula pumila L. from California, but this author (Sawyer) assigns California specimens, including those identified as Betula pumila var. glandulifera Regel, to Betula glandulosa, reserving Betula pumila, with Betula pumila var. glandulifera as a synonym, for plants outside California.
eFlora Treatment Author: John O. Sawyer, Jr.
Jepson Online Interchange
Listed on CNPS Rare Plant Inventory

Previous taxon: Betula
Next taxon: Betula occidentalis

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botanical illustration including Betula glandulosa

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Citation for this treatment: John O. Sawyer, Jr. 2016. Betula glandulosa, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=15650, accessed on December 02, 2016.

Citation for the whole project: Jepson Flora Project (eds.) 2016. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on December 02, 2016.


Geographic subdivisions for Betula glandulosa:
CaRH, Wrn;
Markers link to CCH specimen records. Yellow markers indicate records that may provide evidence for eFlora range revision or may have georeferencing or identification issues. Purple markers indicate specimens collected from a garden, greenhouse, or other non-wild location.
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map of distribution 1
(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).

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Data provided by the participants of the Consortium of California Herbaria.
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CCH collections by month

Duplicates counted once; synonyms included.
Species do not include records of infraspecific taxa.
Blue line denotes eFlora flowering time.