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Key to Triumfetta

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1 Spines of the capsule glabrate; capsule surfaces densely tomentose-pilose
1 Spines of the capsule either retrorsely barbed or densely hirsute on one side; capsule surfaces glabrous, minutely hirtellous, or densely tomentose.
  2 Capsule densely tomentose; spines of the capsule densely hirsute on one side; lower leaf side moderately hairy with simple hairs on the veins and stellate hairs on the blade surface; stamens 5 (10)
  2 Capsule glabrous or sparsely and minutely hirtellous; lower leaf side densely stellate-tomentose on veins and blade surface; stamens 15, 20, or 25