69 



most valuable information on the subject from Messrs. L. Rodway and T. Stephens, 

 of Hobart, and R. H. Cambage, of Sydney, and now believe that I am able to offer 

 a key to the better understanding of what has hitherto been considered a very 

 difficult group of plants. 



A. E. Risdoni, Hook, f., var, elata, Bentham ; [E. radiata, Hook, f., var. 4, 

 non Sieb.). 



I have a specimen of Gunn's No. 1,100, 1812, "J. 1). Hooker, Marlborough, 

 Tasmania, 17th October, 1840." 



B. This is the var. 1 of E. radiata, Hook. f. (non Sieb.). See El. Tas., I, 

 137, as follows : — 



13. Eucalyptus radiata (Sieb., PL, Exsioc, p. 475) ; arbor mediocris, ramulis gracilibus saepe 

 pendulis, foliis anguste ellipticis lanceolatisve medioeribus vix nitidis-nerviis rectis faloatisve, pedunculis 

 subelongatis multifloris, floribus pedicellatis, calyce obconico v. clavato, operculo brevi, capsula pedicellate. 



Variat insigniter 4. foliis majoribus lanceolatis nitidis, capsulis ut in forma 3. — Arbor 



mediocris, ad E. coriaceam tendens. (Gunn, 1,100, 1,110.) 



This is a tree which, e.g., on Mount Wellington, maybe nearly a White Gum, 

 with but a little ribbon at the butt. It is a variety of E. Risdoni, Hook, f., namely, 

 var. elata, Bentham, (B. Fl. Ill, 203). In typical Risdoni the sucker leaves are 

 more or less cordate ; but in the varieties they tend to become oblong, and even 

 nearly orbicular, and the leaves, as higher levels are reached, become more aromatic. 



My identification of Gunn's No. 1,100 appears to be the key to the question, 

 and all the Gum-topped Stringybarks may be looked upon as more or less closely 

 related to this form. 



C. E. obliqua, L'Herit., var. " Gum-topped Stringybark," Waterworks, Mount 

 Wellington, Tasmania. We have trees at an elevation of 1,100 feet, with the leaves, 

 capsules, &c, of E. obliqua ; but bark smooth from the base. The character passes 

 in all forms from this to E. regnans, which in turn passes into broad-leaved forms 

 of amygdalma. (L. Rodway.) 



This form undoubtedly shows affinity to E. obliqua. A second specimen 

 Mr. Rodway labelled "The extreme form of E. obliqua, that Mueller considered a 

 form of haemastoma." 



(a) "Stringy Gum," Huon Road (L. Rodway). The suckers are glaucous and 

 lose their " opposite " character at an early stage. 



(b) Guildford Junction, Tasmania, " Something between E. amygdalma and 



E. obliqua in bark; glaucous, wood pale." (R. H. Cambage.) 



Another specimen of Mr. Cambage's, from the same district, is labelled, 

 " Bark something like E. amygdalina for, perhaps, 20 feet, then gradually clear." 



