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Key to families Table of families and genera
  Index to accepted names and synonyms:
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Scientific Name

Index Page: U

Scientific NameCommon Name
UlexGORSE, FURZE
Ulex europaea
(Under Ulex europaeus)		Synonym (tjm2)
Ulex europaeusNaturalized
UlmaceaeELM FAMILY
Ulmus
  ↳  Key to Ulmus		ELM
Ulmus americanaAMERICAN ELMWaif
Ulmus carpinifolia
(Under Ulmus minor)		Synonym (tjm2)
Ulmus minorENGLISH ELMWaif
Ulmus parvifoliaCHINESE ELM, LACEBARK ELMNaturalized
Ulmus procera
(Under Ulmus minor)		Synonym (tjm2)
Ulmus pumilaSIBERIAN ELMNaturalized
UmbellulariaCALIFORNIA BAY, CALIFORNIA LAUREL, PEPPERWOOD
Umbellularia californicaNative
Umbellularia californica var. fresnensis
(Under Umbellularia californica)		Synonym (tjm2)
UropappusSILVERPUFFS
Uropappus lindleyiNative
Urospermum
Urospermum picroidesNaturalized
Urtica
  ↳  Key to Urtica		STINGING NETTLE
Urtica californica
(Under Urtica dioica subsp. gracilis)		Synonym (tjm2)
Urtica dioicaNative
Urtica dioica subsp. dioica
(Under Urtica dioica)		Mentioned in
a note
Urtica dioica subsp. gracilisAMERICAN STINGING NETTLENative
Urtica dioica subsp. holosericeaHOARY NETTLENative
Urtica gracilis
(Under Urtica dioica subsp. gracilis)		Synonym (tjm2)
Urtica holosericea
(Under Urtica dioica subsp. holosericea)		Synonym (tjm2)
Urtica lyallii
(Under Urtica dioica subsp. gracilis)		Synonym (tjm2)
Urtica urensDWARF NETTLENaturalized
Urticaceae
  ↳  Key to Urticaceae		NETTLE FAMILY
Utricularia
  ↳  Key to Utricularia		BLADDERWORT
Utricularia biflora
(Under Utricularia gibba)		Synonym (tjm2)
Utricularia cleistogama
(Under Utricularia subulata)		Synonym (tjm2)
Utricularia exoleta
(Under Utricularia gibba)		Synonym (tjm2)
Utricularia fibrosa
(Under Utricularia gibba)		Synonym (tjm2)
Utricularia gibbaNative
Utricularia inflata
(Under Utricularia macrorhiza)		Mentioned in
a note
Utricularia intermediaFLAT-LEAVED BLADDERWORTNative
Utricularia macrorhizaCOMMON BLADDERWORTNative
Utricularia minorLESSER BLADDERWORTNative
Utricularia ochroleucaCREAM-FLOWERED BLADDERWORTNative
Utricularia stygia
(Under Utricularia ochroleuca)		Synonym (tjm2)
Utricularia subulataNaturalized
Utricularia vulgaris
(Under Utricularia macrorhiza)		Mentioned in
a note
Utricularia vulgaris subsp. macrorhiza
(Under Utricularia macrorhiza)		Synonym (tjm2)
Utricularia vulgaris var. americana
(Under Utricularia macrorhiza)		Synonym (tjm2)