Class XXI. Order VIII. 331 



Order V. PENTANDRIA. Five stamens. 



401. XANTHIUM. Barren flowers, calyx common, 

 imbricate ; florets funnel form, five cleft ; receptacle 

 chaffy. Fertile flowers, calyx two leaved, two flow- 

 ered ; corolla none ; drupe dry, prickly, cloven ; nu- 

 cleus two celled. 



402. AMBROSIA. Barren flowers, calyx common, 

 one leaved ; florets funnel form, three or five cleft ; re- 

 ceptacle naked. Fertile flowers, calyx one leaved, one 

 flowered ; corolla none ; riut toothed, one seeded. 



403. AMARANTHUS. Barren flowers, calyx three 

 leaved ; corolla none ; stamens three or five. Fertile 

 flowers, calyx three leaved ; corolla none ; styles three ; 

 capsules one celled, opening transversely ; seed one. 



Order VI. HEXJiNDRIJL Six stamens. 



404. ZIZANIA. Barren flowers, calyx none ; co- 

 rolla glume two valved, awnless. Fertile flowers, 

 calyx none ; corolla glume two valved, hooded, awn- 

 ed ; style two parted ; seed one, invested with the co- 

 rolla. 



Order VIII. POLYANDR1A. Eight or more stamens. 



405. SAGITTARIA. Calyx three leaved ; corolla 

 three petalled. Barren flowers with about twenty 

 four stamens. Fertile ones with numerous pistils ; 

 capsules many, swelling, one seeded. 



406. MYRIOPHYLLUM. Calyx four leaved, corolla 

 four petalled. Barren flowers with eight stamens. 

 Fertile ones with four stigmas ; seeds four, coated. 



407. ARUM. Spathe one leafed ; spadix cylindrical, 

 naked at top, with stamens in the middle and germs 

 at the base ; berries one celled. 



