EUCAL YPTUS. i 79 



outer by absence of anthers sterile, always finally deciduous; filaments 

 thread-like, pointed, indexed while in bud or the outer or very seldom 

 all filaments straight before expansion; anthers dorsified, their two cells 

 parallel or divergent, each opening by a marginal or anterior slit or less 

 commonly by a pore; pollen-grains tetrahedrous, smooth, with longitu- 

 dinal apertures. Style long; stigma convex or almost flat, undivided, 

 seldom much dilated beyond the summit of the style. Ovary 2-6-celled, 

 its lower portion grown to the calyx, its upper portion more or less free. 

 Ovules in each cell numerous, the greatest majority remaining unfer- 

 tilized. Cotyledons broad, much compressed, somewhat folded, undi- 

 vided or bi-lobed, curved around the cylindrical straight erect radicle. 



Evergreen trees, scattered as well as gregarious, sometimes of enor- 

 mous height, or dwarfed shrubs, present in all parts of Australia even in 

 intratropic low lands or in arid desert sands or on alpine elevations, more 

 scantily occurring in New Guinea, in Timor, and very rarely in the 

 Moluccas, mostly of rapid growth, flowering occasionally at a very early 

 age; stem often kinofluous; bark either completely persistent or its outer 

 layers deciduous; matured wood always particularly hard; main branches 

 usually distant; foliage often not dense; branches frequently pendent, 

 quite glabrous, or sometimes those of young plants (and even mature 

 ones) rough-hairy; leaves of aged plants nearly always glabrous and 

 thick in texture, never soft-hairy, often scattered and conspicuously 

 stalked or in some species opposite and then generally sessile, sometimes 

 united; those of young plants frequently different in texture, position and 

 shape from those of the more aged plants; these latter generally 

 approaching in form to lanceolar-sickle-shaped, often of equal color and 

 turning one edge toward the zenith and the other toward the ground; 

 much less frequently considerably darker above, and spreading horizon- 

 tally; oil-dots pellucid or concealed; peculiarly and strongly odorous; 

 primary veins often copious and much spreading; inflorescence either 

 axillary or terminal or more rarely both modes united; flowers in single 

 or paniculated umbels, rarely in twos, or solitary; umbel-stalks and 

 flower-stalklets commonly present, the former sometimes much dilated; 

 umbels while very young enclosed within a pair of fugacious and some- 

 times diminutive bracts; calyces of different species very variable in 

 size; lid not rarely provided with a minute early dropping accessory 

 outer layer; filaments gnerally pale with a slightly yellowish tinge, more 

 rarely bright yellow, orange-colored or crimson; inner filaments gradu- 

 ally shorter; connective of anthers usually raised at the summit or dor- 

 sally towards the top into a callous gland; slits of anthers sometimes 

 confluent ; fruits for a long while persistent, from very small in some 

 species to remarkably large in others, oftener smooth than streaked or 

 ridged; valves always glabrous, very rarely by the persistent base of the 

 style permanently connected; seeds long retained in the fixed fruit, soon 



