SYNOPSIS OF THE GENERA. 



CLASS 12. ICOSANDRIA. (20 or more Stamens 

 placed upon the calyx.) 



ORDER I. MONOGYNIA. 1 Pistil. 



1. PKO'NUS, [Page 682.J Calyx five-cleft, inferior. Petals 



five. Fruit a. persistent fleshy drupe, covered with a blue 

 powder or bloom, nut smooth, having a slightly elevated 

 seam. Leaves convuluie, flowers solitary, on a pedicle 

 subumbellated or fasciculated. 



2. CERA'SUS, [Page 684.] Calyx five-cleft, inferior. Petals 



five. Fruit a persistent smooth fleshy drupe, globose, or 

 mnbelicated at the base, and without any bloom on the 

 surface, nut smooth, sub-globose. Leaves conduplicate. 



ORDER II. PENTAGYNIA. 5 Pistils (but variable.} 

 * Flowers complete, superior. 



3. MESPI'LUS, [Page 687.] Calyx five-cleft, foliaceous. Petals 



five. Disk large. Styles two to five, smooth. Fruit 

 turbinate, the area at the apex much dilated, and exposing 

 the hardened ends of the cells. Trees with serrated undi- 

 vided leaves and solitary flowers. 



4. CRAT.S:'GXJS, [Page 688.] Calyx five-cleft, with acute seg- 



ments. Petals five. Styles one to five. Fruit oval or 

 round, the apex closed over the ends of the cells. Trees 

 or shrubs, with lobed leaves and Qymose flowers. 



5. COTONEAS'TER, [Page 690.] Calyx with five short teeth. 



Petals five, small, erect. Stamens erect. Fruit turbi- 

 nate, with the nuts adhering to the inside of the fleshy 

 calyx, but the ends free. 



f Bushes with entire leaves, woolly beneath, and cymose flowers. 



6. PY'RUS, [Page 691.] Calyx with five segments. Petals 



five, roundish. Styles two to five. Fruit (pomum apple) 

 fleshy, with from two to five two seeded cartilaginous cells. 

 Trees with serrated undivided or pinnated leaves and 

 cymosc flowers. 



** Flowers complete, inferior. 



'A, [Page 697.] Calyx five-cleft, persistent. Petals 

 five. Fruit of from one to twelve capsules, tsvo valved, 

 and from two to four seeded. 



