- Lachananthes caroliniana — Carolina redroot
- Myriophyllum alterniflorum — alternate-flowered water-milfoil
- Myriophyllum farwellii — Farwell's water-milfoil
- Myriophyllum heterophyllum — broadleaf water-milfoil
- Myriophyllum hippuroides — western water-milfoil
- Myriophyllum humile — low water-milfoil
- Myriophyllum pinnatum — cutleaf water-milfoil
- Myriophyllum quitense — Andean water-milfoil
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Hedwigiaceae
- Hedwigia ciliata — Hedwig's fringeleaf moss
- Hedwigia stellata
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- Pseudobraunia californica
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- Hippuris montana — mountain mare's-tail
- Hippuris tetraphylla — four-leaf mare's-tail
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- Philadelphus trichothecus — Columbian mock-orange
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- Hylocomiastrum pyrenaicum
- Hylocomiastrum umbratum
- Hylocomium splendens — stairstep moss
- Loeskeobryum brevirostre
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- Hymenophyllum wrightii — Wright's filmy fern
- Callicladium haldanianum
- Ctenidium malacodes
- Ctenidium molluscum
- Ctenidium schofieldii
- Gollania turgens
- Herzogiella adscendens
- Herzogiella seligeri
- Herzogiella striatella
- Herzogiella turfacea
- Homomallium adnatum
- Hypnum bambergeri
- Hypnum callichroum
- Hypnum circinale
- Hypnum cupressiforme
- Hypnum curvifolium
- Hypnum dieckii
- Hypnum fertile
- Hypnum hamulosum
- Hypnum holmenii
- Hypnum imponens — hypnum moss
- Hypnum jutlandicum
- Hypnum lindbergii — Lindberg's hypnum moss
- Hypnum mammillatum
- Hypnum pallescens
- Hypnum plicatulum
- Hypnum pratense
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- Hypnum procerrimum
- Hypnum recurvatum
- Hypnum revolutum — revolute hypnum moss
- Hypnum subimponens
- Hypnum vaucheri
- Isopterygiopsis muelleriana
- Isopterygiopsis pulchella
- Isopterygium tenerum
- Orthothecium chryseum
- Orthothecium intricatum
- Orthothecium strictum
- Platydictya confervoides — algæ-like matted-moss
- Platydictya jungermannioides
- Platydictya minutissima
- Platydictya subtilis
- Platygyrium repens
- Pseudotaxiphyllum distichaceum — pseudotaxiphyllum moss
- Pseudotaxiphyllum elegans
- Ptilium crista-castrensis — knight's plume
- Pylaisiella intricata
- Pylaisiella polyantha
- Pylaisiella selwynii
- Taxiphyllum deplanatum
- Taxiphyllum taxirameum
- Tripterocladium leucocladulum
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