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Leptodon mollis

Wolffia columbiana

Wolffiella lingulata

Wolffiella oblonga

Woodsia ilvensis

Rusty woodsia

Woodsia scopulina

Rocky mountain cliff fern

Woodwardia fimbriata

Giant chain fern

Wullschlaegelia aphylla

Leafless orchid

Wyethia helianthoides

Sunflower mule-ears

Xanthisma texanum

Texas sleepy daisy

Xanthium spinosum

Clotweed

Leptodon ohioense

Leptodon patagonicus

Wyethia glabra

Woodsia appalachiana

Schefflera chapana

Schefflera crenata

Trifolium ruprechtii

Xanthium strumarium

California-bur

Xanthoceras sorbifolium

Yellow-horn