122 CLASSIFICATION. 



'presence of the Corolla j union ^ or separation of Stamens and 

 Pistils {Monoclinoiis^ stamens and pistils on the same corollas ; 

 Diclinous^ stamens and pistils on the different corollas) ; nnion 

 or separation of anthers. 



Synopsis of Jussieu's Method, 



ACOTYI.EDONS, ..... ClASS 1. 



Stems ( Stamens hypog-ynous, 2. 



acrogenous. \ *' perigynous, 3. 



lONOCOTYLEDONS, 



Stems 

 tndoffenous. 



epigrjnous, 4. 



Stamens cpigynous, 5. 



apctalous, < " perigynotis, 6. 



( " kijpogynous, 7. 



C Corolla hypogynous, 8. 



" perigynous, 9. 



f anthers ) ^^ 



I 1,: ;i i -l"' 



moiwpetalous, i „ . combined 



I " cpigynous, I ^,^^^^^^ ' j 



[ distinct, J 



11. 



DICOTYLEDONS. | ( Stamens epigynous, 12. 



Stems polypetalotis, < " hypogynous, 13. 



exogenous. I ( " perigynous, 14. 



\diclinous. . . ..... 15. 



These classes were at first formed of one hundred orders ; 

 under the present modifications of Jussieu's method by Lindley 

 and others, they have been multiplied by establishing new 

 orders of genera which could not be included in any of the 

 former established orders. 



154:. The acotyledons include the cr}^Dtogamous plants of Lin- 

 naeus. They are called Cellulares^ from their being formed of 

 cellular tissue without a vascular system ; and are also called 

 flowerless jplants!^ Their leaves are destitute of veins. They 

 have no seeds with cotyledons, but are reproduced from a pow- 

 der-like substance, called spores^ exhibiting nothing of the parts 

 which constitute the seeds in other divisions of the vegetable 

 kingdom. The monocotyledons constitute a portion of the phe- 

 nogamous plants ; they consist principally of grasses, palms, and 

 liliaceous plants ; they are endogenous as regards the structure of 

 their stems and branches ; — the veins in their leaves are straight 

 and parallel. This division consists of two large groups : — 1st, 

 plants whose flowers have perianths, called Petcdloidce^ as the 

 iris and lily ; the calyx and corolla being in three, or six divi- 

 sions ; — 2d, where, instead of a proper calyx and corolla, the 

 stamens and pistils are surrounded with glume-like bracts ; 

 these are called Glumacem ; as in the grasses. The dicotyl- 

 edons include the greater portion of the phenogamous plants ; 

 these are vascular in their structure, exogenous in their mode of 

 growth, and their leaves are distinguished by branching^ reticle- 

 late veins. 



• It was long asserted by botanists that every plant iiad a flower, although it might be invisible ; 

 bat the Xsrm flowerless is now adopted by many for the cryptogamous family. 



Synopsis of Jussieu's method.— 154. What are the general characterislicg of acotyledons ?— Of mono- 

 •otyledons ? — Of dicotyledons ? 



