Glossary of Botanical Terms:
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trigonous: triangular in cross-section and with the angles somewhat rounded. Fig. 10 F. cf. triquetrous.
Fig. 10. Leaves and Margins in Cross Section. A, plano-convex; B, incurved; C, involute; D, recurved; E, revolute; F, trigonous; G, triquetrous; H, terete.
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