(178)__Huperzia selago, commonly known as alpine clubmoss;

(179)__Hypericum ascyron, commonly known as great St. John's-wort;

(180)__Hypoxis hirsuta, commonly known as yellow star grass;

(181)__Ilex glabra, commonly known as ink-berry;

(182)__Ilex laevigata, commonly known as smooth winterberry holly;

(183)__Impatiens pallida, commonly known as pale jewel-weed;

(184)__Iris prismatica, commonly known as slender blue flag;

(185)__Isoetes acadiensis, commonly known as Acadian quillwort;

(186)__Isoetes prototypus, commonly known as prototype quillwort;

(187)__Isoetes riparia, commonly known as shore quillwort;

(188)__Isotria medeoloides, commonly known as small whorled pogonia;

(189)__Isotria verticillata, commonly known as large whorled pogonia;

(190)__Iva frutescens, commonly known as marsh-elder;

(191)__Juncus alpinoarticulatus, commonly known as alpine rush;

(192)__Juncus dudleyi, commonly known as Dudley's rush;

(193)__Juncus secundus, commonly known as secund rush;

(194)__Juncus stygius, commonly known as moor rush;