EUCALYPTUS MEGACAEPA. 



regnlar or even imperfect dehiscence and is often more blunt, the filaments are yellow, the fruits 

 are semiovate with descending rim and short almost deltoid enclosed valves. 



The affinity of E. megacarpa to E. cosmophylla is less close. 



Oil from the fruits proves almost colorless, of odor similar to that of Cajuput-oil, but more 

 agreeable, of 0"872 specific gravity at 75° F., and deflects the plane of polarized light about 10° 

 left. The oil of the foliage is likely to be similar. 



The proportionate as well as absolute size of the fertile and sterile seeds is at an average so 

 dififerent in many Eucalypts, as to afford often important marks of specific distinctions. The 

 subjoined notes of measurements may thus aid not only in recognizing species scientifically, but 

 also in controlling to some extent the purchase of seeds of particular kinds in the trade. 



Eucalyptus rostrata : fertile seeds | to ^ line long, about f line broad, sterile seeds i to | 

 line long, about \ line broad ; — E. polyanthema, E. melliodora, B. paniculata, E. hemiphloia : 

 fertile seeds -^ to | line long, about ^ line broad, sterile seeds about ^ line long, f to ^ line broad ; — 

 E. goniocalyx, E. cornuta, E. Guanii, E. Stuartiana, E. tereticornis, E. botryoides, E. siderophloia, 

 E. cinerea, E. Leucoxylon : fertile seeds | to 1 line long, J to | line broad, sterile seeds i to | 

 line long, about ^ line broad ; — E. amygdalina : fertile seeds f to 1 line long, ^ to f line broad, 

 sterile seeds i to | line long, f to ^ line broad ; — E. haemastoma : fertile seeds | to 1 line long, 

 about I ILae broad, sterUe seeds about | line long, ^ line broad ; — E. obliqua, E. macrorrhyncha, 

 E. pauciflora, E. Sieberiana : fertile seeds 1 to 1^ lines long, | to 1 line broad, sterile seeds | to 1 

 line long, i to | line broad ; — E. cosmophylla : fertile seeds | to 1 line long, about | line broad, 

 sterile seeds | to 1| lines long, ^ line broad ; — E. gomphocephala : fertile seeds 1 to 1| lines long, 

 J to 1 line broad, sterile seeds 1 to 1^ lines long, ^ to | line broad ; — E. globulus : fertile seeds 1 

 to 1^ lines long, | to 1 line broad, sterile seeds 1 to 1^ lines long, about ^ line broad ; — E. mega^ 

 carpa : fertile seeds 1 to 1^ lines long, | to 1 line broad, sterile seeds 1 to 1^ lines long, ^ to | 

 lines broad ; — E. marginata, E. buprestium : fertile seeds 2 to 3 lines long, 1 to 2 lines broad, 

 sterile seeds 1^ to 2 lines long, | to 1| lines broad ; — E. Abergiana : fertile seeds with their 

 membraneous appendage 3^ to 5 lines long, 1^ to 2 lines broad, sterile seeds 1-^ to 3 lines long, 

 ^ to f line broad ; — E. calophylla : fertUe seeds 6 to 9 lines long, 3 to 4 lines broad, sterile seeds 

 2| to 4 lines long, 1 to 1^ lines broad. 



These measurements were instituted at my request by Mr. Q. Luehmann, who ably aided me 

 in many of the preliminaries for the elaboration of this Eucalyptography, so especially in the 

 arrangement of the vast additional museum-material of this genus, accumulated since the third 

 volume of the Flora Australiensis appeared, fully fourteen years ago. 



Explanation oe Analytic Details. — 1, a small-flowered umbel ; 2, an unexpanded flower, with its lid 

 lifted ; 3, longitudinal section of an unexpanded flower ; 4, some outer stamens in situ ; 5 and 6, front- and back- 

 view of an anther, with part of its filament ; 7, style and stigma ; 8 and 9, transverse and longitudinal section of a 

 fruit ; 10 and 11, sterile and fertile seeds ; 12, embryo in situ ; 13, cotyledons partly spread out, to exhibit the 

 radicle ; 14, transverse section of embryo ; — 1, natural size ; 2-14, variously magnified. 



