PLOEA AUSTRALIENSIS. 



Class L DICOTYLEDONS. 



otem, wlien perennial, consisting of a pitli in tlie centre, of one or more 

 concentric cii^cles of woody tissue, and of the bark on the outside. Embryo 

 ^th two cotyledons, the yoimg stem in germination proceeding from be- 

 tween the two lobes of the embryo or from a notch at its summit. 



do f^*^^^ f^haracters are the most constant to separate Bicofyhdons from Monocofiflc- 

 «^; these two great classes have, however, each a peculiar habit, which in most cases is 



ho^ ^ ^*^^%'»>zed. All Australian trees and shrubs, except FalmSy a few Fems, and Bam- 

 oj, and a few others with linear grass-like leaves, are Bicobjledo^is ; so also are almost all 



four f ^^^P*^.^^*^' ^^ whot'luJ, or ncttcd-veiiicd leaves, or with the parts of the Sower in 

 r3, hyes, or eights, or with indefinite stamens, all these characters being very rai'e iu 



^^^(The following list of Orders contained in this first volume is intended to show the 

 are^'^^^^"f^^^f ''^*^^1*^^^' The characters given are not absolute, nor without exception, and 

 imn^^r^f f ^^^^ pui^ose of calling attention to one or iwo of the most striking or most 

 Au t r I ^"''^^ ^^ ^^*^^ Order. In some cases, where an Order is represented in 



a raliaonlj by some anomalous genus, its exceptional character is placed in a parenthesis. 



analytical key to the Orders will be eiveu at the close oF the ifork.) 



SUBCLASS I. POLYPETAL.E. 

 Petals several, distinct (wanting in a few genera, very rarely united). 



Series I, Thalamiplorj;;. — Torus small or elongated, rarely expanded 

 ^ a disk. Ovary superior. Stamens definite or more frefjuently indefinite. 



peM^^^^^ (Cohors) I. Tl3.nBles.—Slamens indefnite, or if definite, opposite ihe 

 A,.; ^\ ^(^^P^^s dkfinci or united at the base onhj, mperior, or rarely enclosed in a 



•^ 5r T' .^^''^^'y^ -^'^'^^^^ ^n afieshj albumen, 



\ arpels united in Enpomatia and Nump/iaa. Embryo large, without albumen in some 

 ''^^'''^ermacea^^S.mNelumbium.) 



leavG^'^'^Te^^^^'^^^^'*" "^^^^'^^ ^"^'^^ radical or alternate leaves, or climbers with opposite 

 nnnn C3 ®*^'P'*lc8. Sepals usually coloured and deciduous. Petals in a single series or 



"je. Stamens indefinite. No arillus. 

 ^Jsiiall J^^^f^^^ACE^. Shrubs or undershrubs with alternate leaves. No stipules. SepaU 

 ^i^JJ .^f»*baceons and persistent. Petals in a sinde series. Stamens usually uidefimtc. 

 ^*^ed3 with an arillus or strophiola. 



