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Xanthosoma buntingianum

Othonna trinervia

Isocarpha oppositifolia

Rio grande pearlhead

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