81 



The Ry da] mere tree is 40 feet high, and flouri.shing. In every respect that I 

 can see, it is identical with E. ficifolia var. Guiljoylei and E. calofhjlla var. rosea Hort., 

 and I am inclined to think that the more reasonable view is to look upon it as a form 

 of E. calophylla. The habit and size of the hybrid incline to those of E. ccdophylla, 

 while the pink or purple tinge (in contradistinction to the scarlet of E. ^ci folia) naturally 

 occurs in E. calophylla. 



Size and hahii. — E. calofhylla is a huge tree, with gnarled trunk and scrambling, 

 umbrageous branches, the counterpart of the Apple {Angophora intermedia) of eastern 

 Australia. The size is given as up to 150 feet, with a stem-diameter of 10 feet 

 (" Eucalyplographia "), and I am certain this is not exaggerated. 



E. ficifolia, on the other hand, is a small tree; I think it rarely exceeds 30 feet 

 in height, and it is usually erect, and not scrambling. 



The hybrid may be fairly stated as intermediate in size. 



Seeds. — Those of E. calophylla are large, ovate, black, flat, and with a raised 

 angle on one face, the edges acute but scarcely winged, the hilum large on the 

 inner face. 



Those of E. ficijolia are of a pale colour, testa expanded at one end, or round 

 one side into a broad, variously-shaped wing (B.Fl. iii, 256). The hilum is towards 

 the end of the seed, and furthest from the wing. 



The seeds of the E. calophylla x E. ficijolia hybrid are flatter than those of 

 E. ficijolia, and also paler in colour. As compared with those of E. fxifolia, they are a 

 little darker and less winged, but the hilum is more remote from the wing. In other 

 words, they are intermediate between the two species. Most of the seeds are, however, 

 sterile, and these are pale reddish-brown in colour, shining, and mostly boomerang- 

 shaped. 



The sterile seeds of E. calophylla are similar in shape, perhaps a little darker 

 in colour. 



It seems to me that, in this rose-crimson series, we have incontrovertible evidence 

 of hybridisation, the two most obvious factors being colour and size; and I, therefore, 

 add E. calophylla and E. ficifolia to the very long list of pairs of species of which the 

 evidence that they hybridise appears to be sufficiently clear. 



I have touched on the general question of hybridisation in the genus in Repmb 

 Aust. Assoc. Adv. Science, 1904, p. 297, in the Proceedings of this Society, xxx, p.- 492 

 (1905), and on n:any other occasions. (Maiden in Proc. Linn. Soc, N.S.W., xli, 185, 

 1916.) 



