EUCALYPTUS. 



Timbel-stalks and flower-stalklets mncli loftener present than absent, tlie former sometimes mncli 

 dilated ; umbels by the final fall of any sustending leaf ceasing to b& axillary, not rarely capitate, 

 while very young enclosed within a pair of fugacious and sometimes diminutive bracts ; calyces of 

 different species very variable in size ; lid not rarely provided with a minute early dropping 

 accessory outer layer ; filaments generally pale with a slightly yellowish tinge, more rarely bright- 

 yellow or orange-colored or crimson ; inner filaments gradually shorter ; connective of anthers 

 usually raised at the summit or dorsally towards the top into a callous gland ; slits of anthers 

 sometimes confluent ; style seldom very short ; discal lining generally much extended beyond the 

 ovary ; fruits for a long while persistent, from very small in some species to remarkably large in 

 others, oftener smooth than streaked or ridged ; discal space intervening between the edge of the 

 calyx and the base of the valves from narrow to very broad in different species and not seldom 

 protruding; capsular portion of the fruit largely adnate to the calyx-tube, only exceptionally much 

 seceding ; valves always glabrous, very rarely by the persistent base of the style permanently 

 connected ; seeds long retained in the fixed fruit, soon shedding on detachment of the latter ; 

 fertile seeds usually outside dark-brown ; sterile seeds mostly pale-brown and smaller than the 

 others. — Natural cross-fertilisation of flowers only exceptional and then partial ; artificial hybrid- 

 isation easy. 



The genus Angophora differs from Eucalyptus, to which it is closely allied, in the calycine 

 lid of the latter being replaced by distinct somewhat petaloid quite overlapping calyx-lobes ; the 

 bristly hairiness of Angophora occurs also in some species of Eucalypitus, while likewise the 

 denticulations of the calyx-tube of Angophora become developed in the section Eudesmia. 

 The absence of normal petals and the complete conversion of the calyx-limb into a lid form the 

 chief distinctions, by which Eucalyptus is separated from Metrosideros ; a coalescence of lobes 

 (to the number of four) into an operculum is however indicated by the few eudesmoid species ; 

 the segregation of the filaments of the latter into four sets afix)rds some approach to the genus 

 Tristania, although the filaments become not connate into any linear homogeneous membrane, 

 but arise from four protrusions of the discal lining of the calyx. Acicalyptns (Piliocarpus, 

 Brongniart and Gris) and Calyptranthes are more widely distant from Eucalyptus in the not 

 capsular structure of the fruit. 



