Non-native Plant
Siberian Elm

Ulmus pumila

perennial

shrub

Non-native Plant
Siberian Peashrub

Caragana arborescens

perennial

shrub

Non-native Plant
Siebold’s Arrowwood

Viburnum sieboldii

perennial

shrub

Non-native Plant
Silktree

Albizia julibrissin

perennial

shrub

Non-native Plant
Simplestem Bur-reed

Sparganium erectum

perennial

forb

Non-native Plant
Solidstem Burnet Saxifrage

Pimpinella saxifraga

perennial

forb

Non-native Plant
South African Ragwort

Senecio inaequidens

perennial

subshrub

Non-native Plant
Southern Threecornerjack

Emex australis

annual

forb

Non-native Plant
Spiny Threecornerjack

Emex spinosa

annual

forb

Non-native Plant
Spotted Ladysthumb

Polygonum persicaria

annual

forb

Non-native Plant
Spreading Snakeroot

Ageratina riparia

perennial

subshrub

Non-native Plant
Star Of Bethlehem

Ornithogalum umbellatum

perennial

forb

Non-native Plant
Stemless Thistle

Onopordum acaulon

annual

forb

Non-native Plant
Sticky Snakeroot

Ageratina adenophora

perennial

subshrub

Non-native Plant
Stinking Willie

Senecio jacobaea

perennial

forb

Non-native Plant
Summer Snowflake

Leucojum aestivum

perennial

forb

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