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Key to Thunbergia

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1 Petioles wing-margined; corolla yellow to orange, usually with a dark purple ‘eye’
1 Petioles not wing-margined; corolla bright-blue to white.
  2 Calyx bearing about 12 slender, subulate teeth; corolla 2.5-3 cm long, white; leaves 5-8 cm long
  2 Calyx annular; corolla 5-6 cm long, bright-blue or rarely white; leaves 12-20 cm long