TRITICUM. 
511 
46. Teit'icum Linn. Wheat-grass. 
1. '1\ caninum (L.) ; spike rather close, spikelets 2 — 5-tl., 
3 — 5-ribbed gl. and lower pales awned [upper paie emarginate], 
axis and edges of the rachis hispid, 1. fiat rough on both sides, 
root fibrous. — E. B. 1372. P. 62. Agropyron (Beauv.).— St. 
erect. Kibs on the upperside of 1. very slender. Gl. round on 
the back, its ribs reaching the tip and joining to form the 
short awn. Lower pale shorter than its awn ; or in an alpine 
form longer than it. — Banks, rare. P. VII. E. S. I. 
2. T. Donidnum (Wilmott); spike rather close, spikelets 2-6-11., gl. usually 
shortly awned strongly 4— 6-ribbed with ribs edges tip and awn asperous, 
lower pale narrowed abruptly and with scarious margins at apex, 4 — 6-ribbed 
with awn \ — i its length, upper pale bluntly pointed densely ciliate on the lateral 
keels densely asperous and with a well-marked midrib towards the apex, the tvo 
lateral ribs terminating in teeth which fall short of the apex, axis hairy, rachis 
ciliate, 1. thin flat with many slender ribs, "soboliferous."— .4(;ropi/rom Doniunum 
(Buch.-White), T. alpinum (Don. MSS.).— Variously referred to Sp. 1 and 3, hut 
differing from both in the character of the upper pale; closely allied to the 
Scandinavian T. violaceum (Hornem.).— Rocks, Ben Lawera, Mr G. Don. Re- 
discovered 1878 by Mr J. C. Melvill. P. VIII. S. 
3. T. repens (L.) ; spike rather close, gl. 5 — 7-ribbed equalling 
at least 5 of the 4 — 5-fl. spikelet rough on the keel, lower pale 
acuminate, axis asperous, rachis with rough angles not brittle, 
I. mostly flat the many slender ribs each bearing a row of 
deciduous hairs above, soboliferous. — E. B. 909. P. 62. Agro- 
pyron (Beauv.). — L. at first involute afterwards flat, ribs on 
upperside not much raised nor nearly hiding the in term, surface 
of the leaf. Rachis glabrous or downy with forward prickles 
on the angles. Gl. scarcely keeled, acuminate-subulate ; ribs 
reaching the tip. Pales rarely awned. [The shape of the gi. and 
pales varies considerably, extreme forms are: — var. barbatnm (Dnv.-Jouv.) "gi. 
very attenuate subulate or awned, pales long-awned," and var. obtuswm (Sy.) 
" gl. obtuse obliquely truncate, pales obtuse with a minute apiculus."] — 
Common. P. VI. Couch-grass. E. S. I. 
4. T. pun'gens (Pers.) ; spike close, gl. with 7 — 9 thick ribs 
not exceeding h the 5 — 12-fl. spikelet rough on the keel, lower 
pale acute, axis asperous, rachis nearly or quite smooth not 
brittle, I. with involute edges tJte many thick closely -placed ribs 
slightly rough and each bearing a row of acute points above, 
upper part of 1. wholly involute (subulate and rigid), soboli- 
ferous.— /S"?/. E. B. 1811. Agropyron (R. & ^.)—St. erect, like 
a corn-fieid. Ribs on upperside of 1. so broad and so elevated 
as nearly to hide the interm. part of the leaf. Gl. keeled ; ribs 
