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Betulaceae Gray

桦木科

Betulaceae
Betula mandshurica

Credit: Xiangying Wen

Habit: tree, shrub

Taxon group: dicots

Plant: monoecious, dioecious

Leaf: position: alternate

Leaf: nature: simple

Leaf: venation: pinnate

Leaf: blade: margin: entire, lobed, cleft, parted or divided, dentate, doubly serrate

Leaf: stipules: present

Flowers: inflorescence: catkin

Flowers: sexuality: unisexual

Flowers: perianth number: 0, 1, 2, 3, 4, 5, 6

Flowers: sepal number/calyx lobes: 1, 2, 3, 4, 5, 6

Flowers: petal number/corolla lobes: 0

Flower: bract: present

Stamen: number: 2, 3, 4

Stamen: arrangement: antepetalous, alternate or antesepalous

Stamen: anthers: opening by longitudinal slits, 2-celled

Stamen: filaments: connate into 1 tube or bundle

Pistil: style: styles more than 1

Pistil: ovary: 2-loculed

Pistil: ovule: 1 per locule, 2 per locule

Ovary: position: inferior

Fruit: types and characters: a nut (incl. achene, caryopsis, schizocarp, pyrene, etc.), winged/samara

Fruit: seed: 1 seed

Seed: embryo: straight

Seed: endosperm: seeds without endosperm

Google Image Search: Link

Dictionary of The Families & Genera of Chinese Seed Plants: Link

Vascular Plant Type Catalog at NYBG: Link


 

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