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Isoetes nuttallii (20)	Isoetes occidentalis (5)	Isoetes orcuttii (16)	Isoetes storkii (1)
Isoglossa cooperi (2)	Isolatocereus dumortieri (2)	Isolepis carinata (16)	Isolepis cernua (29)
Isolepis levynsiana (1)	Isolepis setacea (6)	Isomeris arborea (4)	Isomeris arborea var. globosa (4)
Isopogon anemonifolius (2)	Isopogon anethifolius (1)	Isopogon formosus (8)	Isopogon longifolius (1)
Isopyrum hallii (2)	Isopyrum occidentale (4)	Isopyrum thalictroides (1)	Isothecium spiculiferum (1)
Isotoma axillaris (7)	Isotoma fluviatilis (4)	Itea ilicifolia (4)	Itea virginica (6)
Iva acerosa (15)	Iva annua (2)	Iva axillaris (45)	Iva axillaris ssp. robustior (4)
Iva hayesiana (42)	Iva xanthifolia (8)	Ivesia aperta var. aperta (20)	Ivesia aperta var. canina (31)

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