244 noRTus ghamineus woburnknsis. 



cessively till the end of summer. Seed ripe in about three 

 weeks after tlie time of flowering. 



ELYMUS striatus. Striated Lyme-grass. 



Specific character: Spike erect; spikelets two-fiowered^ 

 fringed ; involucre or calyx striated, short. 



Obs. — Native of North America. Root perennial; was 

 introduced into this country about 1790. 



Experiments. — At the time of flowering, the produce from 

 a clayey loam is 20,418 lbs. per acre. 



From these details, therefore, this species is inferior in nu- 

 tritive powers to the Philadelphian lyme-grass in the pro- 

 portion of 17 to 16. It is also much later in the production 

 of foliage in the spring, and does not come into flower till 

 after that species has nearly perfected its seed. It cannot, 

 therefore, be recommended for the purposes of the agri- 

 culturist. 



Flowers about the latter end of July, and ripens the seed 

 in August. 



ELYMUS Sibericus. Siberian Lyme-grass. 



SjJeci/ic character: Spike pendulous, like an arch ; spike- 

 lets longer than the calyx. Native of Siberia. Root, 

 on a moist or clayey soil, biennial ; on a sandy soil it 

 continues several years. 



Experiments. — At the time of flowering, the produce from 

 a rich sandy soil is 16,335 lbs. per acre. 



The produce of this grass is very coarse, and the weight 

 of the crop, therefore, though considerable, is comparatively 

 of no value. It is a native of Siberia, and withstands the 

 effects of the severest continued frost, but not sudden changes 

 from frost to mild weather. It requires to be sown every 

 year, and treated as an annual. It comes into flower the 

 second season, about the second or third week in June, and 

 continues to emit flowering culms till autumn. The seed is 

 ripe in about three weeks after flowering. A light rich sili- 

 ceous soil appears to be best adapted to its growth. In the 



