WEEDS OF PONDS, RIVERS, DITCHES 329 



VALERIANACE.E 



Valerian or All-heal (Valeriana officinalis L.) is a 

 frequent inhabitant of ditches and marshy places by 

 ponds and rivers. It is a tall plant, 2 to 4 feet high, 

 with pinnate leaves, having four to ten pairs of lanceo- 

 late and usually serrate leaflets and one terminal leaflet. 

 The flowers have five-lobed pale pink corollas, and are 

 arranged in terminal corymbose clusters, opening in 

 June to July. 



COMPOSITES 



Hemp-Agrimony (Eupaforium cannabinum L.) is a 

 widely distributed plant, found on the banks of streams 

 and in wet ditches. The stems are usually 2 to 4 feet 

 high, round and woolly ; the leaves consist of three 

 to five lanceolate-serrated segments. The flowers 

 are pale reddish -purple in colour, and arranged in 

 dense terminal corymbs ; they appear from July to 

 September. 



SCROPHULARIACEJi: 



Marsh Figwort (Scrophularia aquatica L.) is often 

 abundant on the edges of ponds, rivers, and ditches, 

 where it impedes the flow of water and interferes with 

 angling. 



It has a well developed creeping rootstock and erect, 

 square, winged stems, smooth below, 2 to 4 feet high. 

 The leaves are opposite, oblong-lanceolate, with cordate 

 base and crenate-serrate margins. The flower is two- 

 lipped, green below and dark purple in its upper 

 portion, the corolla tube bulging. 



Knotted Figwort (S. nodosa L.) grows in somewhat 

 drier situations. It has a tuberous knotted rootstock, 

 and leaves with doubly serrate margins, the serrations 



