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Ptelea.—Stamens alternating with the 
petals. Ovary ona convex disc, 2-celled; 
cells 2-ovulate. Fruit a 2-seeded samara 
Shrubs. 
Erodium.—Carpidia 5, verticillate round 
a columnar axis. Styles connate at their 
apex. 
Pentaceena.—Sepals 2-seriate, persistent; 
external sepals 3, with cucullate apex 
terminating in a spine, internal sepals, 
mucronate. Ovary l-ovulate. Style 2- 
cleft. Fruita utricle. 
Frankenia.—Calyx tubular, 4-5 lobed. 
Petals 4 or 5, unguiculate. Capsule 1-, 
celled, dehiscent by valves. Ovules 
few, inserted on parietal placenta. 
d. Floral parts polypetalous, superior. 
Ribes.—Petals unguiculate and with the 
stamens inserted on the calyx limb. 
Fruit baccate, w-seeded. Shrubs. 
e. Lloral parts incomplete. 
Glaux.— Perigonium campanulate, 5- 
lobed, petaloid. Ovary 5-valved. 
Polygonum.— Perigonium 5 - sepalous, 
persistent. Stigmas 2-3, capitulate. 
Fruit an akene enclosed in the persis- 
tent perigonium. 
