364 CLASS XXI. ORDER 1. 



ed ; corolla none. Fertile flowers, calyx of crowded 

 scales with no corolla, and a germ between each 

 scale ; style one ; seed one, compressed. 



378. Alnus. Barren flowers, ament composed of 

 wedge shaped, three flowered receptacles; corolla 

 four parted. Fertile flowers, scales of the ament two 

 flowered ; corolla none ; styles two; seed compressed, 

 ovate. 



Orde7- V. PENTANDRIA. Five stamens. 



379. Xanthium. Barren flowers, calyx common, 

 imbricate ; florets funnel form, five cleft ; receptacle 

 chafll'y. Fertile flowers, calyx two leaved, two flow- 

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

 cleus two celled. 



380. Ambrosia. Barren flowers, calyx common, 

 one leaved; florets funnel form, three to five cleft; 

 receptacle naked. Fertile flowers, calyx one leaved, 

 one flowered ; corolla none ; nut toothed, one seeded. 



381. Amaranthus. Barren flowers, calyx three 

 leaved ; corolla none ; stamens three to five. Fertile 

 flowers, calyx three leaved; corolla none; styles 

 three; capsules one celled, opening transversely; 

 seed one. 



■ Order VI. HEXANDRIA. Six stamens. 



382. ZizANiA. Barren flowers, calyx none; corolla 

 glume two valved, awnless. Fertile flowers, calyx 

 none; corolla glume two valved, hooded, awned; 

 style two parted; seed one, invested with the corolla. 



Order VIII. POLYANDRIA. Eight or more stamens. 



383. Sagittaria. Calyx three leaved; corolla three 

 petalled. Barren flowers with about twenty-four sta- 



