Betula occidentalis

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Betula occidentalis
Foliage

Secure  (NatureServe)
Scientific classification Edit this classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Rosids
Order: Fagales
Family: Betulaceae
Genus: Betula
Subgenus:
Betula subg. Betula
Species:
B. occidentalis
Binomial name
Betula occidentalis
Natural range of Betula occidentalis
Synonyms
  • B. fontinalis Sarg.

Betula occidentalis, the water birch or red birch, is a species of

paper birch.[2]

Trunk from along the Columbia River in Chelan County, Washington

It is a

leaves are alternate, ovate to rhombic, 1–7 cm (122+34 in) long and 1–4.5 cm (121+34 in) broad, with a serrated margin and two to six pairs of veins, and a short petiole up to 1.5 cm (12 in) long. The flowers are wind-pollinated catkins 2–4 cm (341+12 in) long, the male catkins pendulous, the female catkins erect. The fruit is 2–3 cm (341+14 in) long and 8–15 millimetres (1412 in) broad, composed of numerous tiny winged seeds packed between the catkin bracts.[1][3][4]

The identity of similar birches in Alaska is disputed; some include them in B. occidentalis, while others regard them as hybrids between Betula neoalaskana and Betula glandulosa.[1] A 2023 study sequenced chloroplast genomes of species from the genus Betula for phylogenetic analysis. Of the Betula species, B. occidentalis was most closely related to B. pendula purple rain and B. platyphylla.[5]

The foliage is browsed by sheep, goats,[6] and birds; some small birds also consume the seeds.[2]

Some Plateau Indian tribes used water birch to treat pimples and sores.[7]

It is also a riverside tree found in western USA that reacts to water stress by becoming isohydric.[8]

References

  1. ^ a b c Flora of North America: Betula occidentalis
  2. ^ .
  3. ^ Plants of British Columbia: Betula occidentalis Archived 2017-12-06 at the Wayback Machine
  4. ^ Jepson Flora: Betula occidentalis
  5. PMID 36845004
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  6. .
  7. .
  8. .

Further reading

External links