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Key to Hydrolea

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1 Flowers in axillary cymes; leaves 1.5-4 cm wide; axillary thorns present in the axils of some leaves; corolla 7-11 mm long.
..2 Calyx and stem sparsely pubescent with spreading, jointed hairs 2-3 mm long
..2 Calyx and stem glabrous, minutely puberulent with simple hairs, or with sessile glands
1 Flowers in terminal cymes or corymbs; leaves 0.2-3.0 cm wide; axillary thorns present or absent; corolla 5-17 mm long.
....3 Stems pubescent or hispid, also usually covered with shorter glandular hairs; [s. TX southwards]
....3 Stems densely pubescent, with few or no glandular hairs; [collectively widespread in se. Coastal Plain from se. TX northwards and eastwards].
......4 Leaves elliptic to lanceolate, 2-3 cm long, 0.3-1.0 cm wide; leaf margins serrulate; styles 5-10 mm long; axillary thorns 0-1 per node (often absent); [SC, GA, FL]
......4 Leaves ovate to ovate-lanceolate, 3-6 cm long, (1.0-) 1.5-2.5 cm wide; leaf margins entire; styles 10-15 mm long; axillary thorns 1-2 per node; [GA and westwards]
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