| 31. | Petioles of opposite leaves fuse at base to form interpetiolar stipules, characteristic of Rubiaceae.
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| 32. | Leaves are simple or pinnate, with a margin usually toothed, and interpetiolar stipules.
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| 33. | Stipules are of medium length, a bit extended at the base, strongly dented.
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| 34. | The leaf stipules are lanceolate, acute; they fall soon after the leaf expands.
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| 35. | The stipules submembranous, semi-or fully amplexicaul but free, 2 5 mm.
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| 36. | Leaves are often more or less palmately lobed or palmately compound and always bear stipules.
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| 37. | The leaves are made up of toothed oval leaflets and have bristle-tipped stipules.
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| 38. | Large prominent stipules occur at the points of attachment of the leaves to the stem.
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| 39. | Stipules are red, usually about long.
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| 40. | The false stipules are large and fimbriaceous.
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