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Click the number at the start of a key lead to highlight both that lead and its corresponding lead. Click again to show only the two highlighted leads. Click a third time to return to the full key with the selected leads still highlighted.

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
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