Bromus tectorum L. (Synonym : Anisantha pontica C.Koch)

Family : Poaceae [Naturalized plant]

Bromus tectorum L. var. glabratus Spenn. (Synonym : Bromus tectorum L. f. glabratus (Spenn.) H.St.John)

Family : Poaceae [Naturalized plant]

Broussonetia monoica Hance (Synonym : Broussonetia × kazinoki Siebold var. australis Suzuki)

Family : Moraceae

Broussonetia papyrifera (L.) L'Hér. ex Vent. (Synonym : Broussonetia papyrifera (L.) L'Hér. ex Vent. var. japonica Blume)

Family : Moraceae

Broussonetia × kazinoki Siebold (Synonym : Broussonetia × hanjiana M.Kim)

Family : Moraceae

Bulbophyllum drymoglossum Maxim. ex Ökubo

Family : Orchidaceae

Bulbophyllum inconspicuum Maxim.

Family : Orchidaceae

Bulbostylis barbata (Rottb.) C.B.Clarke (Synonym : Isolepis cumingii Steud.)

Family : Cyperaceae

Bulbostylis densa (Wall.) Hand.-Mazz. (Synonym : Isolepis capillaris Roem. & Schult. var. trifida (Kunth) Miq.)

Family : Cyperaceae

Bupleurum euphorbioides Nakai (Synonym : Bupleurum tatudintze V.I.Baranov)

Family : Apiaceae