﻿GRASSES OF SCOTLAND. 7 



69. BUCETUM. — Florets membranous at the summit, occasionally 

 with a dorsal awn arising from a little beneath the summit of the 

 outer palea. Inner palea minutely and closely fringed. Styles aris- 

 ing from the summit of the ovarium. Ligule of the upper sheath 

 very short, scarcely perceptible. Four species. (Plates XLV. XL VI. 

 XLVII.) 



73. BROMUS. — Florets membranous at the summit, with a promi- 

 nent dorsal awn arising from a little beneath the summit of the outer 

 palea. Inner palea strongly and rather distantly fringed. Styles 

 arising from below the summit of the ovarium. Ligule of the upper 

 sheath prominent. Eight species. (Plates XL VIII. XLIX. L. LI.) 



81. TRISETUM. — Florets membranous at the summit, hairy at 

 the base, with a long dorsal awn arising from about the centre of the 

 outer palea. Outer palea five-ribbed. Three species. (Plates LIL 

 LIII. LIV.) 



84. FESTUCA. — Florets awned from the very summit of the outer 

 palea. Leaves of the root not broader than those of the stem. Three 

 species. (Plates LIV. LV. LVI. LVII. LVIII. LIX. LX.) 



87. TR1TICUM. — Spikelets either sessile or on very short foot- 

 stalks, arising alternately on each side of the rachis. Calyx of two 

 glumes situated opposite to each other. Five species. (Plates LXL 

 LXII. LXII1.) 



92. ELYMUS. — Spikelets sessile arising in pairs on each side of 

 the rachis. Calyx of two glumes situated parallel to each other. One 

 species. (Plate LXIV.) 



94. LOLIUM. — Spikelets sessile, arising alternately on each side 

 of the rachis. Calyx mostly of only one glume situated opposite to the 

 rachis ; the inner glume when present is situated with its back to the 

 rachis. Two species. (Plate LXV.) 



