(24) 



6. Ptelea. — Stamens alternating with the 

 petals. Ovary on a convex disc, 2-celled; 

 cells 2-ovulate. Fruit a 2-seeded samara 

 Shrubs. 



7. Er odium. — Carpidia 5, verticillate round 

 a columnar axis. Styles connate at their 

 apex. 



8. PentaCcBna. — Sepals 2-seriate, persistent; 



external sepals 3, with cucullate apex 

 terminating in a spine, internal sepals, 

 mucronate. Ovary 1-ovulate. Style 2- 

 cleft. Fruit a utricle. 



9. Frankenia. — Calyx tubular, 4r-5 lobed. 

 Petals 4 or 5, unguiculate. Capsule 1- 

 celled, dehiscent by valves. Ovules 

 few, inserted on parietal placentce. 



d . Floral parts j^olypetalous, superior. 



1. Kibes. — Petals unguiculate and with the 

 stamens inserted on the calyx limb. 

 Fruit baccate, oo-seeded. Shrubs. 



e. I'loral parts incomplete. 



1. Glaux. — Perigonium campanulate, 5- 

 lobed,petaloid. Ovary 5-valved. 



2. Polygonum. — Perigonium 5 - sepalous, 

 persistent. Stigmas 2-3, capitulate. 

 Fruit an akene enclosed in the persis- 

 tent perigonium. 



