46 TRIAND. DIG¥N. 



Culms 2 feet high, often rough above. Leaves linear-lanceolate, 

 acuminate. Spike long. Cal., as in the last species, very large. 

 Spikelets distant. Florets about 6, elliptical, rather obscurely I'ib- 

 bed. — Said to have the povi^er of intoxicating, if the seeds are 

 eaten, and even of occasioning death, 



29. ELYMUS, 



1. E. arenarius (upright Sea Lyme-grass), spike upright 

 dense, spikelets pubescent, flowers awnless as long as the calyx, 

 leaves involute rigid. E. B. t, 1672. 



Hab. Common on the east and north coast of Sutherland, and shores 

 of Caithness, Borrer and Hooker. Heughs of St. Cyrus near Mon- 

 trose, and sea-coast near Ayre, Maugh. Fl. (rarely) July. 1/ . 



Root much creeping, and hence, as the Arumla arenaria, of great value 

 in binding loose blowing sands. Culms 3 — 4 feet high, glabrous. 

 ieoiJPs glaucous, pungent. LigulefihovX,. Spike 4 — 6 inches long. 

 Spikelets geminate, of about 3 flowers, distant on the rachis. 

 Cal. valves 2, lanceolate, acuminate. Valves of cor. resembling 

 them, but ext. one broader; int. bifid at the point, angles of the 

 folds ciliated. Seeds made into bread in Iceland. 



30. HORDEUM. 



1. H. viur'mum {Wall Barley), caZ. valves of the intermediate 

 floret linear-lanceolate ciliated, those of the lateral florets 

 setaceous scabrous. Light/, p. 108. £. B. t. 1971. 



Hab. \A^alls and by way-sides. Light/. Mr. Arnott thinks it is not 



found to the north of the Firth of Forth. Fl. June, July, ©. 

 One foot high. 



2. H. pralense [Meadow Barley), cal. valves all setaceous sca- 

 brous. E. B. t. 409. 



Hab. East point of Salisbury Craig, Mr. J. Neill. Fl. summer 



months. 1/ . 

 One foot and a half to two feet high, nearly erect. 



3. H, maritimum [Sea- side Barley), cal. valves smoothish, the 

 int. one of the lateral florets semi-lanceolate, tlie rest setace- 

 ous. E. B. t. 1205. 



Hab. Sea-coast, Angais-shire, G.Don. Fl. July. ©. 



Similar as these 3 species of Hordeum may appear to a casual obser- 

 ver, they are truly distinct, and admirably characterized by the 

 form, &c. of the cal. valves. — This is the smallest species, seldom 

 exceeding 8 or 10 inches, glaucous and procumbent at the base. 



31. ROTBOLLIA. 



1, R. incurvata {Sea Harc?-gr«55)j spike filiform or awl-shaped, 



cal. 2-valved. 

 «. spike subulate, curved, ^gilops iticurvata, Light/, p. 632. 



Rothollia incurv., E. B. t. 760. 



