Robert W. Freckmann Herbarium

Polygonaceae: Buckwheat

Small ball-like flowers in clusters of racemes, spike-like panicles, or heads. Plants with jointed stems with swollen nodes resulting in the name meaning "many knees". Leaves simple usually alternate often forming a collar-like sheath enclosing the node.
Flower Formula:  Sepals 5 or 3+3; Petals 0 Glossary

Genus 
(Click for Taxon List)
WI Taxa
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Photo Genus Traits Google Searches
Fagopyrum
buckwheat
1 Photo of Fagopyrum Tepals (petals and sepals) 5 in single spiral. Flowers open in corymb. Leaves triangular. Images   Information
Fallopia
bindweed
6 Photo of Fallopia Tepals (petals and sepals) 5; plants twining like a vine or shrub-like Images   Information
Persicaria
knotweed, tearthumb, smartweed
14 Photo of Persicaria Tepals (petals and sepals) 5 in dense but variously shaped clusters. Bracts green, leaves not jointed on their stalk. Images   Information
Polygonella
joint-weed
1 Photo of Polygonella Tepals (petals and sepals) 5 in single spiral. Flowers in terminal raceme. Stalk of flower jointed near base. Images   Information
Polygonum
smartweed
7 Photo of Polygonum Tepals (petals and sepals) 5 in solitary or small clusters. Bracts dry, not green; leaves jointed Images   Information
Rheum
rhubarb
1 Photo of Rheum Tepals (petals and sepals) 6. Large basal leaves, thick reddish flower stem. Images   Information
Rumex
dock sorrel, sorrel
14 Photo of Rumex Tepals (petals and sepals) 6 in 2 series of 3. Images   Information


         
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