GRAMINA. 
69 
their opinions during their lifetime, and if their views alter, will demand 
to be judged by their latest published opinions. In the case of A. 
setacea, no doubt, Hudson's first impression was right, but an excep- 
tional case like this is no ground for establishing a precedent for 
depriving botanists of the right to withdraw statements which they 
subsequently believe to be erroneous. 
Bog Hair- Grass. 
Section III.— AIRELLA. D2tmort 
Annual. S])ikelets with 2 perfect florets, but no third rudimentary 
one ; the second floret sessile, or very shortly stipitate — the axis 
not being developed between it and the first floret, or but slightly 
developed. Lower pale at first subscarious, but at length becoming 
hardened over the caryops, bifid, with 2 rather long acute subsetaceous 
cusps at the apex. Awn dorsal, evidently twisted at the base, geni- 
culate. Florets without hairs at the base, or with very short ones. 
SPECIES III.-AIR A CARYOPHYLLEA. Linn. 
Plate MDCCXXXR". 
EelcL Ic. Fl. Germ, et Helv. Yol. I. Tab. XCIY. Fig. 180. 
Billot, Fl. Gall, et Germ. Exsicc. No. 481. 
Avena caiyophyllea, Wigrj. Koch, Syn. Fl. Germ, et Helv. ed. ii. p. 922. 
Airopsis caryophyllaea, Fries, Summ. Yeg. Scand. p. 78. 
Annual. Radical leaves none. Stem leaves setaceous, involute, 
deeply channelled, slightly rough, pale green, the uppermost one much 
shorter than its sheath ; sheaths smooth or nearly so ; ligule pro- 
minent, rather long, lanceolate, acute, nearly entire. Panicle very 
lax, erect, open while in flower, and open or sHghtly closed afterwards; 
panicle-branches capillary, ascending or ascending-spreading, smooth 
or very shghtly rough, subtrichotomously branched, the ultimate 
branches in corj^mbs or racemes, divaricate or erect. Spikelets nume- 
rous, on unequal pedicels, some shorter and some longer than their 
f-pikelets, or (more rarely) all longer than their spikelets. Glumes 
longer than the florets. Lower pale terminating in 2 long narrow 
taperkig acute serrated cusps. A^vn dorsal, from near the middle of 
the pale, twisted in the basal half, geniculate about the middle, about 
half as long as the pale, and fi*om one-third to half as long as the 
glumes, present in both florets, or rarely absent in the lower one (?). 
Second floret sessile or subsessile; third floret wholly absent. Florets 
with tufts of very short hairs at the base. 
