Betulaceae subfam. Betuloideae
Deut. Dendrol. 106, 1893 (as Betulae)
Treatment appears in FNA Volume 3.
Trunks and branches terete. Bark thin, close or exfoliating in thin sheets, becoming thicker and frequently furrowed or broken in age; lenticels often present, prominent, sometimes becoming greatly expanded horizontally. Bark and wood strongly tanniferous. Young twigs and buds often covered with small to large, resinous glands; pith triangular in cross section. Leaves 3-ranked, occasionally nearly 2-ranked. Staminate flowers: perianth of 4(–6) sepals, well defined, minute, membranaceous. Pistillate flowers 2–3 per scale, scales arranged in conelike catkins; perianth not obvious; ovules with 1 integument. Infructescences 1–4 cm, conelike, composed of many scales; scales either persistent or deciduous with fruits, crowded, small, woody or leathery. Fruits tiny samaras, lateral wings 2, membranous, sometimes reduced to ridges; pericarp thin, leathery.
Primarily boreal and cool temperate zones of Northern Hemisphere
Genera 2, species 60 (2 genera, 26 species in the flora).
Facts about "Betulaceae subfam. Betuloideae"
|Author||John J. Furlow +|
|Distribution||Primarily boreal and cool temperate zones of Northern Hemisphere +|
|Illustration copyright||Flora of North America Association +|
|Illustrator||John Myers +|
|Publication title||Deut. Dendrol. +|
|Source xml||https://firstname.lastname@example.org/aafc-mbb/fna-data-curation.git/src/f50eec43f223ca0e34566be0b046453a0960e173/coarse grained fna xml/V3/V3 70.xml +|
|Taxon family||Betulaceae +|
|Taxon name||Betulaceae subfam. Betuloideae +|
|Taxon parent||Betulaceae +|
|Taxon rank||subfamily +|
|Volume||Volume 3 +|