93 



Some interesting examples of the wing are to be found in the Corymbosge, both 

 in Series Terminaliptera and Series Naviculares. In the former,., see Plate 256, fig. la, 

 the testa is expanded into a broadish terminal membrane or wing, while the testa on 

 the endosperm is marked on the ventral by irregular depressions and wrinkles, which 

 are the impressions of the sterile, and fertile seeds-. The sides- are moderately smooth 

 and glossy, and offer but slight resistance in distribution by natural agencies. It will 

 be noted that the wing is uniquely constructed in proportion to the endosperm, so that 

 it is admirably adapted for dissemination by the wind. 



In E. calophylla, Plate 257, fig. 2a, the seed is comparatively narrow, being 

 compressed laterally, and it is moderately straight on the ventral side and marked 

 with numerous small ridges and depressions, while the dorsal is gradually curved and 

 expanded into a very thin, sharp, semi-transparent, membranous keel (6), which, no 

 doubt, is intended by nature to serve the purpose of a wing. See also E. corymbosa, 

 same Plate, figs, la to lc, which show the rudimentary dorsal wing more plainly, as 

 indicated by (b). 



In E. Watsoniana and its allies, Plate 257, figs. 4a to 9a, the seed is broadly 

 navicular, or compressed dorsiventrally, showing a broadish hilum in the centre, or 

 nearly so, of the ventral side, while the dorsal is smooth and glossy and contracted into a 

 somewhat thickened obtuse keel, and the margin is sometimes bordered by a thin wing 

 or membrane. See E. trachyphloia, fig. 9a. The development of the seeds of this 

 Series is perhaps more symmetrical than many others. The hilum is approximately 

 in the centre of the ventral side, and the expansion of the endosperm is moderately 

 even at both ends, and also at the sides, thus forming a more or less circumferential 

 margin, which is sometimes bordered by a minute membrane or wing. 



In seeds of the following species the wing is terminal, or nearly so : — 



E. Abergiana. E. latifolia. 



E. Cliftoniana. E. perfoliata. 



E. dichromophloia. E. pyrophora. 



E. ferruginea. E. ptychocarpa. 



E. ficifolia. E. setosa. 



E. Foelscheana. E. terminalis. 



In the following the wing is terminal, but more or less rudimentary : — 

 E. Burracoppnnensis . E. Oldfieldi. 



In the following the wing is circumferential, accompanied by one or more very 

 small transverse wings : — 



C 



E. eudesmdbides. E- tetragona. 



E. tetraptera. 



