EUCALYPTUS HEMIPKLOIA. 



Mnrrumbidgee in Silurian shales and sandstone, also more or less on all geologic formations on the 

 western slope of the Main Dividing Eange of New South Wales down to the tertiary plains (Wil- 

 kinson) verging northward to New England (C. Stuart), can be distinguished from the typical E. 

 hemiphloia only in perhaps more extensively persistent bark, in paler dull foliage and chalky-white 

 bloom on the panicles and in calyces somewhat larger and tapering more gradually into a thicker 

 stalklet. The name of E. albens only arose from a misprint of E. pallens and was first promul- 

 gated without any diagnosis, and this specific designation is apt to mislead, as the whitish hue, 

 significant of E. albens, and for which it is called "White Box-tree" occurs only in a particular 

 variety chiefly of the western interior, where even this characteristic is often not more remarkable 

 than in several other congeners. 



E. hemiphloia is nearest allied to E. populifolia, E. Behriana and E. odorata ; from the first 

 it differs in the laminar secession of the bark from the branches, in longer, narrower and less 

 shining leaves, in larger flowers on more elongated stalklets, longer more pointed lid, apertures of 

 the anthers not so close to the summit, and larger and especially more elongated fruits with 

 valves somewhat removed from the orifice. — From E. Behriana, which stands in close relationship 

 to E. largtflorens, it is less easily distinguished in all cases, but it is often of taller stature, not 

 so often remaining shrubby, the bark is lighter in color and not smooth by secession of outer 

 rather dark-brownish layers ; the leaves are longer and in proportion to their length usually 

 narrower, also mostly of lighter color, the panicles ampler (those of E. Behriana being compara- 

 tively narrow), the flowers and fruits are larger and provided almost as a rule with distinct 

 stalklets, the tube of the calyx is somewhat angular, and the lid is never hemispherical ; 

 E. hemiphloia recedes from E. odorata in the external paleness of the persistent portion of its 

 bark, in the more extensive secession of the bark from the branches, in the broader leaves of 

 thicker consistence with less spreading and less copious veins and less distinguishable oil-dots, in 

 not usually solitary axillary umbels, often more acute lid and more deeply inserted valves of the 

 fruit. The reliability of these distinctions should be further traced in South Australia, wherever 

 the two species grow promiscuously. E. hemiphloia seems readily separable from E. Bowmanii 

 by the less spreading veins of the leaves, more paniculate umbels on less flattened stalks, upwards 

 more attenuated lid, stamens much more inflexed while in bud, the openings of the anthers less 

 wide, and the flat top of the ovary, which has a semiglobular-conical summit in E. Bowmanii ; the 

 fruit of the latter is not yet available for comparison. 



E. drepanophylla, which comes very near to E. leptophleba and E. crebra, belongs to the 

 series of Ironbark-trees (with therefore furrowed and dark-colored bark), has usually narrower 

 leaves of less straightness and of lighter green, with very subtle much diverging and also more 

 copious veins, a shorter lid, anther-cells slit in their whole length and proportionately shorter 

 fruits. To B. drepanophylla verges Bentham's variety parviflora (flora Australiensis iii. 217) 

 mentioned doubtfully under E. hemiphloia ; it is according to Fitzalan's note on Ironbark-tree, the 

 anthers however seem not to open with regular slits. The often angular fruit of E. hemiphloia 

 reminds of that of E. goniocalyx, which species however does not pertain to the section Micran- 

 therfe and is moreover recognized already by the flatness of its flowerstalks. 



Explanation of Analytic Details. — 1, calyx, the lid lifted ; 2, longitudinal section of an unexpanded 

 flower ; 3, stamens in situ ; 4, and 5, front- and back-view of an anther with portion of filament ; 6, style and 

 stigma ; 7, longitudinal section of fruit ; 8, transverse section of fruit ; 9 and 10, fertile and sterile seeds ; 11, portion 

 of leaf ; all (but varioosly) magnified. 



