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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 Manfreda

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1 Perianth lobes erect, 4-8 mm long; [collectively widespread].
..2 Anthers 13-17 (-20) mm long; perianth (including the ovary) 26-35 mm long; perianth lobes 2.5-3 mm wide at the base
..2 Anthers 8-10 mm long; perianth (including the ovary) 20-23 mm long; perianth lobes ca. 1.5 mm wide at the base
1 Perianth lobes spreading or recurved, 7-21 mm long; [e. TX].
....3 Filaments and style included in, or exserted from the perianth tube by 5-22 mm; fresh flowers with sweet odor.
......4 Filaments shorter than the perianth; perianth tube 23--36 mm long; leaf margins coarsely toothed
......4 Filaments longer than the perianth, exserted by 5-22 mm; perianth tube 6-26 mm long; leaf margins minutely toothed
....3 Filaments and style exserted from the perianth tube by 4.0-9.7 cm; fresh flowers with cooked onion odor
........5 Leaves spreading; flowers erect, almost appressed to the inflorescence axis
........5 Leaves erect or arching; flowers spreading from the inflorescence axis
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