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Keys: Central America (flowers, fruits)
Mascagnia allopterys. [Tetrapterys allopterys Moris; reproduced from G. G. Moris, 1848. — Caption to accompany the drawing published in the protologue, translated from Moris's Latin.]

1. Flowering branch. 2. Flowering axillary branch; stipules inserted on stem below base of petioles. 3. Fruiting branch. 4. Floriferous, bracteolate peduncle in the axil of a bract. 5. Flower. 6. Stamens, with the filaments connate into a ring at base. 7, 8, and 9. Stamens in abaxial view, lateral view, and adaxial view. 10. Dorsal connective exceeding the locules of the anther [That may be an error on the part of Moris; that drawing looks like an abaxial view of a sepal bearing two glands. WRA]. 11. Very hairy ovary and styles. 12. Floral diagram. 13. Peduncle bearing a [complete] fruit. 14, 15, and 16. Different samaras with a number of lateral wings. 17. Samara with part of the pericarp removed to show the seed attached below the apex by a short funiculus. 18. Fruit in cross-section. 19. Stalked receptacle with calyx and filaments of stamens. 20. Seed. 21. Embryo with one of the cotyledons removed. 22. Cotyledons and embryo. 23. Abaxial view of part of leaf with glands on each side of dorsal nerve. 24. Malpighiaceous hair.