1' Staminodes present in 90-100% of flowers.....(2)

2  Staminodes filiform or uniformly tapered from base to tip.....(3)

2' Staminodes oblong to rectangular in outline, tapering only near tip if at all.....(5)

3  Filaments 0-1.5 mm; staminodes 1.0-4.5 mm long, reflexed against perianth.....B. filifolia

3' Filaments 2-8 mm; staminodes 0.0-7.0 mm long, recurved to erect.....(4)

4  Perianth length 19-24 mm; style 8.0-9.5 mm; ovary 4.0-5.0 mm; anther 5.0-5.5 mm; San Marcos,
San Diego County.....B. filifolia x B. orcuttii

4' Perianth length 24-36 mm; style 10.5-17 mm; ovary 3.5-8.2 mm; anther 5.4-8.9 mm; Santa Rosa Plateau,
Elsinore Peak (Riverside County) to Miller Mountain (San Diego County).....B. santarosae

5  Staminodes gen erect, edges flat to inrolled, sometimes hooded, gen purple.....(6)

5' Staminodes recurved, edges flat, not hooded, pointed at tip, gen white; Mission Trails Regional Park,
San Diego County.....B. elegans ssp. elegans

6  Staminodes inrolled, often hooded at apex, lvs 2-3; mainland & insular.....B. terrestris ssp. kernensis

6' Staminodes flat, cuspidate at apex, lvs 1; San Clemente Island.....B. kinkiensis