HORTUS GRAMINEUS WOBURNENSIS. 23 



opening ; it is oblong, flattened, and tapers to a point 

 at each end. 



Refer. I. A branchlet with a ripe seed. 

 2. A seed of the natural size. 

 2. The same magnified. 



The Poa trivialis, Poa pratensis, Poa angustifolia, 

 Poa carulea, Poa cenisia and Poa fertilis have their 

 seeds distinguished by a woolly web-like substance ; 

 in the Poa trivialis it is so powerful as to prevent the 

 seeds from separating in sowing, and recourse is had 

 to rubbing the seed with sand, saw-dust, malt-dust, 

 &c., by which the seeds are separated, and prepared 

 for being regularly distributed over the soil. 

 Fig. 14. Briza media, common quaking-grass. 



The inner husks enclose the seed unchanged till 

 ripe ; it is roundish, and very small ; the hollow, or 

 concave form of the husks, with their shining mem- 

 branous appearance, peculiarly distinguish the seeds 

 of this genus. 



Refer. 1. A spiket of ripe seed. 

 2. A seed the natural size. 

 2. The same magnified. 



The other species of quaking-grass are very in- 

 ferior in value to this one, and the seeds should be 

 carefully avoided when mixed with the superior 

 pasture grasses. 

 Fig. 15. Dactylis glomerata, round-headed cock's-foot-grass. 



The husks of the corolla envelope the seed, and 

 adhere to it without opening : it is oblong, slender, and 

 very acute, rounded on one side and marked with a 

 longitudinal furrow on the other. 

 Refer. 1. A spiket of ripe seed. 



1. The same magnified. 



2. A seed of the natural size. 

 2. The same magnified. 



The other species of cock's-foot-grass being either 

 very rare, or natives of foreign countries, there is 

 little danger of the agriculturist being mistaken in the 

 seed of this most valuable species. 

 Fig. 16. Cynosurus cristatus, crested dog's-tail-grass. 



