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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 Hydrolea

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1 Flowers in axillary cymes; leaves 3-14 cm long, 1.5-4 cm wide; axillary spines present in the axils of some leaves; corolla 7-8 mm long.
..2 Calyx and stem sparsely pubescent with spreading hairs 2-3 mm long
..2 Calyx and stem glabrous, or minutely puberulent or with sessile glands
1 Flowers in terminal cymes or corymbs; leaves 2-6 cm long, 0.6-2.5 cm wide; axillary spines present or absent; corolla 10-15 mm long.
....3 Leaves elliptic to lanceolate, 2-3 cm long, 0.6-1.0 cm wide; axillary spines absent or rudimentary
....3 Leaves ovate to ovate-lanceolate, 3-6 cm long, 1.5-2.5 cm wide; axillary spines present, well-developed, to 1.5 cm long