HP«i 



60 



EXPOSITION 



OFTH£ 



NATURAL SYSTEM OF JUSSIEU, 



From Sir J. E. Smith's " Grammar of Botany*^* London. 

 1821. 8t>o. 



The Classes sccg fifteen^ not distinguished by any particular 

 appellations. One of them is Acotyledonus (plants destitute 

 of a Cotyledon;) three are JHonocotyledonous (plants with a 

 simple undivided Embryo;*) the remaining eleven Dicotyledo- 

 nous (plants whose Embryo divides at the top into two parts 

 or lobes, which are the Cotyledons.^) 



The Orders are one hundred^ distributed in natural series 

 under every class, and each defined by rather full definitions, 

 taken, in the first place, from the parts of Fructification, and 

 illustrated by secondary characters, founded on any other cir- 

 cumstance. 



The Genera stand, in one or more sections, according to 

 their respective affinities, and with their essential characters 

 under each order, at the end of which are usually many valu- 

 able critical remarks. 



• The embryo or germ of the Seedy called corculum by Lin- 

 nxus. This part sends out the Boot downwards, and the 

 Plumula^ or bud of the Stem or Herbage, upwards. 



t The Cotyledons or Seed lobes are closely attached to the 

 Embryo, commonly two, rarely more, in some tribes altoge- 

 ther wanting. They either ascend out of the ground, and per- 

 form for a while the office of Leaves, or remain buried, till 

 they gradually decay . 



