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Isocoma arguta

Carquinez goldenbush

Isodendrion laurifolium

Isoetes bolanderi

Ischaemum longisetum

Iseilema macratherum

Xanthosoma callejasii

Ischaemum tumidum

Cypripedium statterianum

Cypripedium × superciliare

Cypripedium × swanianum

Cypripedium swinburnei

Isoetes appalachiana

Isocoma drummondii

Isoetes engelmannii

Isoetes lacustris

Lake quillwort

Isolepis fluitans

Floating club-rush

Isotria medeoloides

Small whorl pogonia

Isoetes tuckermanii

Isoetes texana

Imperata cylindrica

Sharp grass