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| 1 |
Sheathing petiole base and leaf blade glabrous at margin. |
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(2) |
| + |
Sheathing petiole base and often also leaf blade ciliate at margin. |
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(4) |
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| 2 (1) |
Pedicels, hypanthia, and sepals glabrous |
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1 B. scopulosa |
| + |
Pedicels, hypanthia, and sepals ± glandular hairy. |
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(3) |
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| 3 (2) |
Inflorescence branches, pedicels, hypanthia, and sepals sparsely subsessile glandular |
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2 B. crassifolia |
| + |
Inflorescence branches, pedicels, hypanthia, and sepals densely long glandular hairy |
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3 B. purpurascens |
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| 4 (1) |
Leaf blade narrowly obovate, margin entire, not ciliate; petals narrowly obovate |
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4 B. emeiensis |
| + |
Leaf blade orbicular, broadly ovate, or obovate, margin subentire, obscurely crenate, dentate, serrate, or doubly serrate, ciliate; petals subspatulate, elliptic, or orbicular. |
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(5) |
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| 5 (4) |
Leaf blade orbicular or broadly ovate to broadly obovate, margin subentire or obscurely crenate; inflorescence branches and pedicels sparsely subsessile glandular; sepals spreading, glabrous, apex sometimes sparsely dentate; petals orbicular |
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5 B. pacumbis |
| + |
Leaf blade obovate to broadly so, margin dentate, serrate, or doubly serrate; inflorescence branches and pedicels long glandular hairy; sepals glandular hairy, apex not dentate; petals subspatulate or elliptic. |
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(6) |
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| 6 (5) |
Leaf blade dentate and serrate, subsessile glandular, margin only proximally ciliate; sepals subsessile glandular, veins mostly confluent at apex, margin glabrous; petals elliptic |
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6 B. tianquanensis |
| + |
Leaf blade serrate or doubly so, glabrous, margin ciliate; sepals abaxially long glandular hairy, veins not confluent at apex, margin denticulate-ciliate; petals subspatulate |
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7 B. stracheyi |
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