202 JUSSIEU'S NATURAL SYSTEM. 



10. This division consists of the second, third, and 

 fourth classes ; all established on the situation of the 

 stamen with respect to the pistil ; and hence called 

 hypostaminetBj peristaminece, and epistamineee. 



CLASS II. HYPOSTAMINE.E. 



11. In addition to the character of monocotyledones, 

 these plants have stamens of definite number, hypogy- 

 nous, that is, fixed into the same receptacle as the pistil. 



The floral envelope is generally composed of scales ; in some its 

 place is supplied by a membranous sheath. The ovary is superior, 

 and surmounted with one or more styles, and sometimes by sessile 

 stigmas. Their fruit are one-celled, containing one or many seeds, 

 or consists of a seed apparently naked, or covered with a coriaceous 

 envelope. 



12. The families of plants which enter the present 

 class are seven, from the twelfth to the eighteenth, viz. 

 nympheacece, saururece, piperitce,aroidece, typhacete, cijpc- 

 racete and grammea. 



12. Nympheacese Nymphaca. 



13. Sanrureae Sanrnrus. 



14. Piperitae Piper. 



15. Aroideae Arum. 



16. Typhaceae Typha. 



17. Cyperaceae Cy perns. 



18. Gramineae True grasses. 



CLASS III. I'ERISTAMINE*. 



13. Besides the structure peculiar to monocotyle- 

 dones, the plants of this class have perigynous stamens, 

 that is, stamens situated around the pistil, and inserted 

 into the calyx or corolla. 



