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Key to Burmannia

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1 Floral tube obtusely 3-angled, greenish to creamy white; flowers in a capitate cluster (solitary in depauperate individuals)
1 Floral tube 3-winged, violet or yellow to greenish; flowers in a spicate cyme (solitary in depauperate individuals)
  2 Flowers blue, with perianth lobes paler and sometimes cream; basal leaves absent
  2 Flowers yellow or greenish; basal leaves present