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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 Abdra

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1 Pubescence of the lower leaves of stalked cruciform trichomes; siliques densely pubescent; fruiting branches congested, mostly < 1 cm long and appearing almost glomerate; seeds 4-8 per silique, each 1.0-1.5 mm long
1 Pubescence of the lower leaves of sessile cruciform trichomes; siliques glabrous; fruiting branches elongate; seeds 8-15 per silique, each 0.5-0.8 mm long
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