384 



Polygonacece Polygonum* 



P. amphibium is a perennial aquatic or semi-aquatic native 

 species. When growing in water the petioles are very long 

 and the stipules smooth, whilst the terrestrial form has short 

 petioles and hispid stipules. The flowers are bright red. 



4. P. vaccinifolium. This is a desirable creeping branched 

 sub-shrubby species. Leaves small, oblong-ovate, acute, with 

 slightly revolute margins. Flowers bright rosy red, in nume- 

 rous terminal spikes towards the end of Summer. Native of 

 Northern India. 



5. P. orientale. A tall annual species from 3 to 4 feet 

 high. Leaves large, ovate-acuminate, pilose or nearly glabrous. 

 Flowers deep rosy purple or white, in long drooping racemes. 

 Northern India and China. 



2. RHEUM. 

 Perennials with usually very large radical leaves on long 



Fig. 206. Rheum- undulatum. (About -^ nat. size.) 



petioles, and an erect branched somewhat leafy inflorescence., 



