Ranunculus pusillus var. pusillus (low spearwort)

Bermuda
Berteroa incana
Berteroa incana (hoary alyssum)
Beta vulgaris var. altissima
Betula occidentalis (water birch)
Betula papyrifera (paper birch)
Betula pendula
Betula x sandbergii
Bhutan
Bidens beckii (Beck's water-marigold)
Bidens bidentoides (Delmarva beggarticks)
Bidens bipinnata
Bidens cernua
Bidens connata (purplestem beggarticks)
Bidens coronata (crowned beggarticks)
Bidens frondosa
Bidens tripartita
Bidens tripartita (threelobe beggarticks)
Bigelowia nudata ssp. nudata (pineland rayless goldenrod)
Billbergia nutans
Bistorta officinalis
Bistorta vivipara
Blysmus rufus (red bulrush)
Boehmeria cylindrica (smallspike false nettle)
Boletus aereus
Boletus aestivalis
Boletus calopus
Boletus comptus
Boletus edulis

Image of Ranunculus pusillus var. pusillus (low spearwort) 1
USDA-NRCS PLANTS Database / Britton, N.L., and A. Brown. 1913. An illustrated flora of the northern United States, Canada and the British Possessions. Vol. 2: 106.