BOS ALES. 525 



sometimes yariously united afterwards with the calyx-tube, 



Fig. 469. 



Fig. 469. — DioiuBa m/mdpula. Plant with flower-stalk. Natural size. 

 Fig. 470 —Flower-cluster. Natural size. 

 Fig. 471. — Pistil cut vertically. Magnified. 



or enclosed in the swollen top of the peduncle ; styles usU' 

 ally distinct. 

 Order Haloragese. — Mostly aquatic lierbs, about eighty species. 



