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Key to Waltheria

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1 Calyx tube 1.7-2.5 mm long; stem nodes knobby, joints extended 0.8-1.0 mm; leaf surface glabrate, puberulent, drying brownish olive, dark brown, bronze, or coppery; anthers ovate when dehisced; styles densely white-sericeous; capsules with dense white puberulent line at apical valve margin
1 Calyx tube 2.5-2.9 mm long; stem nodes even or extended < 0.5 mm; leaf surface tomentose or pubescent, drying olive; anthers oblong when dehisced; styles hirsutulous near base; capsules lacking dense white puberulent line at apical valve margin
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