228 POPULAR FIELD BOTANY. 
stalk, proceéds from almost every leaf. This common species 
may be gathered on road-sides from June to September. 
The genus Zormentilla differs from Potentilla only in 
having eight divisions to the calyx instead of ten. One 
species, 7. reptans, scarcely differs from P. reptans. T. 
officinalis is frequently found on moors and heaths. 
IcOSANDRIA. POLYGYNIA. 
CALYCIFLORZ. RoSAcE. 
GEUM. (AvEns.) 
Generic Character. Calyx ten-cleft, alternate segments 
minute. Petals five. Seed-vessels with long awns. 
Geum urBanumM. (Plate XIV. Fig. 53.) Common Avens, 
Herb Bennet. Frequent in hedges and woods. Stem 
about two feet high. Root-leaves large, divided, and on 
long foot-falks. Upper leaves divided into three. Flowers 
very small, petals yellow, and spreading. Fruit with long 
awns. 
Geum rivaLE. Water Avens. Less common than the 
last, and much more beautiful. This elegant plant is found 
in marshes, and wet moory ground. It is a shorter but 
