TRIANDRIA— DIGYNIA. Rottbollia. 175 



L. avvense. With. 168. Fl. Br. 151. Engl. Bot. v. 16. t. 1125. 



Knapp t. 102. Hook. Scot.Ab. Schrad. Germ. v. 1.399. Host 



Gram. v. 3. 17. t.25. 

 L. temulentum. Hucls. 55. 

 L. temulentum, a variety. Sincl. 301. 

 L. varum Gesneri. Moris, v. 3. 181. sect. 8. t. \.f. with a spike of 



the last, annexed. 



In fields, but not common. 



In Scotland. Mr. J. Mackay, and Mr. Hopkirk. Near Waltham- 

 stow. Mr. E. Forster. 



Annual. July. 



Rather smaller and smoother than the preceding, of which it is 

 probably but a variety. The awns, represented too long in Engl. 

 Bot., are either wanting, or at most very short, lax and weak. 

 There are sometimes 2 little inner valves to the calyx ; some- 

 times none at all. Schrader observes that the upper part of the 

 stem, and the common stalk of the spike, are not invariably 

 smooth. 



58. ROTTBOLLIA. Hard-grass. 



Linn. Suppl. 13. Schreb. Gen.72l. Juss.3\. Fl. Br. \5l. Lam. 

 t.48. 



Common receptacle, or main stalk, many-flowered, elongated, 

 jointed, finally separable, with a channel in each joint, al- 

 ternately disposed, to receive xhejloi-ets, which are mostly 

 2 in each channel, of a different structure from each other, 

 1 only being always perfect. Cal. of 2 parallel valves, 

 opposite to the channel, lanceolate, spreading whilst in 

 blossom. Cor., in the perfect floret, of 2 lanceolate, acute, 

 membranous, nearly equal, valves, inflexed at the edges ; 

 in the other similar, if furnished with stamens ; if not, 

 merely a rudiment, or scale. Nect. of 2 acute scales. 

 Filam. capillary. Anth. pendulous, cloven at each end. 

 Germen oblong, obtuse, in 1 floret only. Styles short. 

 Stigmas widely spreading, feathery. Seed elliptic-oblong, 

 shut up in the cavity of each joint of the stalk, by the 

 closed glumes, and falling off" with it. 



Habit and size very various. Spikes either solitary, or ag- 

 gregate, brittle when the seed is ripe. 



1. R. incurvata. Sea Hard-grass. 



Spike cylindrical, tapering. Calyx-valves combined below. 



Floret solitary. Corolla awnless. 

 R. incurvata. Linn. Suppl. 114. tVilld. v. 1.463. Fl. Br. 151. 



