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 Loliiim pererine, 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 o'ew?'«</«^//s, 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 muritium, wall-barley, way-bennet-grass. 



The husks cover the seed without opening; it is 

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

 ing in an awn. 



The seed of the Hordeiim pratense, meadow barley 

 grass, is readily distinguished from that of the Ho7- 

 deum mnrinnm 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 (smother worth- 

 less 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; 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 tliorough acquaintance with the foregoing prin- 



