Habit: herb

Important diagnostics: cystoliths present

Taxon group: dicots

Stem: winged

Plant: monoecious, dioecious

Leaf: position: opposite, alternate

Leaf: nature: simple, compound

Leaf: blade: margin: lobed, cleft, parted or divided

Leaf: stipules: absent

Flowers: inflorescence: fascicle, panicle

Flowers: sexuality: unisexual

Flowers: sepal number/calyx lobes: 5

Flowers: sepal position: all free from one another

Flowers: petal number/corolla lobes: 0

Stamen: number: 5

Stamen: arrangement: alternate or antesepalous

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

Pistil: ovary: 1-loculed

Pistil: ovule: 1 per locule

Pistil: pistil: ovules attached to the apex of the ovary

Ovary: sessile

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

Seed: embryo: curved

Seed: endosperm: seeds with endosperm

Google Image Search: Link

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

Vascular Plant Type Catalog at NYBG: Link