274 



Fig. 25G. Catabrosa aquatica (L.) Beauv. ; Britton and 

 Brown, 111. Fl., 1 : 194. Watkh Whorl-ckass. — A smooth, soft 

 l)ereunial, with creeping or ascending cnlnis 2 to 6 dm. long, Hat 

 leaves and open panicles 5 to 20 cm. long, the spreading branches 

 in whorls. — In swales and along brooks, often in shallow water, 

 Newfoundland and Labrador, to Quebec and Alaska, south to Ne- 

 braska, Colorado, and Utah. [Europe and Asia.] June-August. 



