HORTUS GRAMINEUS WOBURNENSIS. 27 



of twenty-two apparently distinct varieties of perennial 

 rye-grass, has afforded me proofs of the above facts ; 

 and also that out of that number from five to nine 

 only can be considered, to a certain extent, permanent 

 varieties. 



Refer. 1. Calyx and a diseased seed, rather uncommon, of 

 the Lolium perenne, the natural size. 



1. The same magnified. 



2. A seed the natural size, convex side. 



2. The same magnified. 



3. A seed the natural size, concave side. 

 3. The same magnified. 



Fig. 23. Elymus geniculatus, jointed lyme-grass. 



The husks of the blossom adhere to the seed, which 

 is convex on one side, and strap-shaped. 

 Refer. 1. A seed the natural size, convex side. 



2. The same, shewing the furrowed side. 

 Fig. 24. Hordeum murinum, wall-barley, way-bennet-grass. 



The husks cover the seed without opening; it is 

 oblong, bellying, angular, tapering to a point, termi- 

 nating in an awn. 



The seed of the Hordeum pratense meadow barley 

 grass, is readily distinguished from that of the Hor- 

 deum murinum by its being much rounder, or bellying, 

 while that of the meadow-barley is slender and taper- 

 ing : the longitudinal groove or furrow of the seed of 

 the H. murinum is only half the depth of that of the 

 H . pratense. 



The seed of the Hordeum maritimum (another 

 worthless annual), is only half the size of the former, 

 is plump like the seed of the way-bennet, but is less 

 bellying, and more tapering to the awn 5 and it is also 

 of a darker brown colour. 

 Refer. 1. Seeds of the Hordeum murinum, with the involucre 



and calyx, of the natural size. 

 2. A seed the natural size. 



Fig. 25. Triticum repens, creeping-rooted wheat or couch-grass. 



The husks of the blossom enclose the seed until it is 



perfected ; and afterwards open and emit it : the seed 



is oval-oblong, and obtuse at both ends ; on this side 



convex, on the other furrowed. 



The utility of a thorough acquaintance with the foregoing prin- 



