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Birches
Most rated Betula records are fire-resistant — 9 of 15 records, including the genus rated as a group. These counts describe the cited records — 15 records carrying 158 evidence rows from 41 cited sources; they do not make one verdict for the genus.
Rated as a group: Birch Betula Fire-resistant Consensus 11 sources rate the genus as a
whole. Species evidence never rolls upward into a genus verdict, and genus claims never
override a species record.
› Fire-resistant
8 species
-
River birch Fire-resistant Betula nigra -
Black birch Fire-resistant Betula lenta -
Paper birch Fire-resistant Betula papyrifera -
Yellow birch Fire-resistant Betula alleghaniensis -
Grey birch Fire-resistant Betula populifolia - Aliso blanco Fire-resistant Betula alba
-
Monarch birch Fire-resistant Betula maximowicziana -
Whitebarked Himalayan birch Fire-resistant Betula jacquemontii
Documented conflict
1 species
Awaiting evidence
5 species
- Betula platyphylla Awaiting evidence Betula pendula
- Betula pubescens Awaiting evidence Betula pubescens
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Water Birch Awaiting evidence Betula occidentalis - Betula glandulosa Awaiting evidence Betula glandulosa
- Betula costata Awaiting evidence Betula costata
About birches
Corpus context. Betula is the directory's #26 largest of 550 genus groups: 15 records carrying 158 evidence rows from 41 cited sources, recorded as tree, shrub , hardy across USDA zones 1–9. Those are corpus facts, not a whole-genus flammability claim.
More about Betula: Wikipedia — external references; not evidence sources.