(75) 



C. Floivers incomplete not amentaceous. 



1. Amarantus. Perigonium 3-5-sepalous. 

 Fruit a circumscissile capsule. 



2. Atriplex. $ perigonium 5-sepalous. $ 

 perigonium 2-parted. Stigmas 2. Fruit 

 a compressed utricle. 



3. Ceratophyllum. $ perigonium co-sepa- 

 lous. Anthers sessile. Ovary of the $ 

 flower 1-celled, 1-ovulate. Fruit a nut- 

 let with persistent style. Aquatic. 



4. Eremocarpus. $ perigonium 5-6 part- 

 ed. $ perigonium 0. Ovary 1-celled, 

 1-ovulate. Fruit a 2-valved capsule. 



5. Xanthium. $ inflorescence: involucre 



oo-phyllous, oo-flowered. Perigonium 

 5-dentate. ? inflorescence: involucre 

 garnophyllous, 2-flowered. Fruit a pseu- 

 docarp enclosed in the indurated invol- 

 ucre. 



6. Ambrosia. $ inflorescence: involucre 

 gamophyllus, co-flowered. ? -inflores- 

 cence: involucre gamophyllus, 1-flow- 

 ered. Spines of the involucre 1-seriate. 



7. Franseria. $ inflorescence: involucre 

 gamophyllus, co-flowered. ? inflores- 

 cence: involucre gamoyhyllous, 1-4- 

 flowered. Spines of the involucre co-se- 

 riate. 



