EUCALYPTUS PREISSIANA. 



distinction in the text of that species. The next, to which E. Preissiana bears alliance, is B. 

 cosmophylla, but the leaves of the latter are more scattered (though not figured so), generally 

 narrower and more acute, the flowerstalks are shorter and not much dilated, the flowers not so 

 large, the filaments of paler color, the fruits smaller with less descending rim and never top- 

 shaped, but always devoid of any prominences encircling the valves, whUe the sterile seeds are 

 much more slender. E. Oldfieldi and E. alpina are still further removed. The frequent confluence 

 of the longitudinal slits of the anthers in an arched terminal curvature reminds of the dehiscence 

 of the Eenantherae. 



Among other Eucalypts with opposite leaves none have leafstalks except the very dissimilar 

 E. tetrodonta, E. erythrocorys, E. tetragona, E. grandifolia and E. doratoxylon (the outer 

 stamens of the latter having been illustrated as anantherous erroneously). 



Bentham united with E. Preissiana also E. pachypoda, which is however identical with the 

 almost simultaneously described E. grossa. 



I have in the description laid some stress on the shape of the placental column in describing 

 this and several other species of Eucalyptus. An apt opportunity is afforded now, to contrast the 

 main-differences, shown by that organ in a number of Eucalypts through a special illustrated 

 plate, hereto appended. 



The specimens, from which this Eucalypt was first described, were got by Dr. Ludwig 

 Preiss, who from 1839 to 1841 instituted extensive searches after objects of natural history in 

 South-Western Australia, and then brought together also large collections of Museum-plants from 

 regions then teeming with novelties ; among several new species of Eucalyptus, contained in his 

 collections, the present one was chosen by Dr. J. 0. Schauer to commemorate this meritorious 

 collector's name. 



Explanation op Analttic Details. — 1, an nnexpanded flower, the lid lifted ; 2, longitadinal section of an 

 unexpanded flower ; 3, some stamens in situ ; 4 and 5, front- and back-view of an anther with portion of filament ; 

 6, style and stigma ; 7, a separate fruit ; 8, transverse section of two fruits ; 9, longitudinal section of a fruit ; 10 

 and 11, sterile and fertile seeds ; 12, portion of leaf ; fig. 1-6 and 10-12 variously magnified, 7-9 of natural size. 



Explanation op Anatomic Plate. — ^Longitudinal sections of various Euoalyptus-fmits, natural size : 1, E. 

 erythrocorys ; 2, E. calophylla, the horizontal valve, adnate to the broad dissepiment, at the back of the cavity 

 removed ; 3, E. megacarpa, in some fruits the longitudinal section shows the channel more distinctly between the 

 valves and the ring of the disk, the prominence of the annular protrusion being then also more conspicuous ; 4, E. 

 obcordata ; 5, E. buprestium ; the sterile seeds are sometimes broader ; 6, E. setosa ; 7, E. longifolia, the placentas 

 are occasionally broader ; 8, E. csesia ; 9, E. Planchoniana, the sterile seeds occur sometimes broader ; 10, E. 

 miniata; 11, E. tetragona; 12, E. megacarpa, the placentas are sometimes slightly larger ; 13, E. Oldfieldi ; 14, E. 

 Watsoniana ; 15, E. Abergiana ; 16, E. gomphocephala ; 17, E. Preissiana ; 18, E. pyriformis ; 19, E. ficifolia. 



