﻿146 GRASSES OF SCOTLAND. 



fringed. Pedicle of second floret slightly hairy. Filaments three. 

 Anthers notched at each extremity. Ovarium obovate. Styles two, 

 distinct. Stigmas feathery. Scales acute, notched ; (Fig. 6.) 



rigida. — A short stout variety from three to five inches 



high, with a short simple panicle of few spikelets. Found in exposed 

 situations at an elevation of 2500 feet above the sea. 



extensa, — A tall and slender variety, growing from 



eight to twelve inches in height, with a simple panicle of few spike- 

 lets. Found at an elevation of about 2000 feet above the sea. 



Obs. — This grass is closely allied to Poa nemoralis, but differs from 

 it in the ligule of the upper sheath being prominent ; upper leaf scarcely 

 as long as its sheath ; all the joints situated on the lower third of the 

 stem, and covered by the sheaths ; stem slightly roughish ; — where- 

 as in P. nemoralis the ligule is very short ; upper leaf as long and 

 often longer than its sheath ; upper joint situated not below the cen- 

 tre of the stem, and not covered by the second sheath ; stem smooth. 

 (Plate XXXVI.) 



From Poa montana, in the florets being webbed ; upper joint si- 

 tuated on the lower third of the stem ; lower floret equal in length to 

 the large glume of the calyx ; — whereas in P. montana the florets are 

 not in the slightest degree webbed ; upper joint situated about half- 

 way up the stem ; lower floret shorter than the large glume ; the pa- 

 nicle longer and more slender, of fewer spikelets on longer foot -stalks ; 

 the leaves more taper-pointed. (Plate XXXIX.) 



From Poa polynoda, in the florets being webbed ; joints not exceed- 

 ing three in number, situated on the lower third of the stem ; upper 

 joint covered by the second sheath ; — whereas in P. polynoda the flo- 

 rets are not webbed ; joints six or seven in number ; upper joint si- 

 tuated above the centre of the stem, and not covered by the second 

 sheath. (Plate XXXIX.) 



From Poa ccesia, in the florets being webbed ; lower floret equal in 

 length to the large glume of the calyx ; — whereas in P. ccesia theflo- 

 rets are not webbed, and the lower floret is longer than the large glume 

 of the calyx ; the spikelets are larger, and the glumes of the calyx 

 nearly equal. (Plate XL.) 



From Poa compressa, in the outer palea being five-ribbed ; spikelets 



