254 Ward. — On Relations between Host and Parasite 
in Index Kewensis , cf. Flor. Germ., i. 349, t. 6 , f. 3. It is 
generally regarded as a distinct variety of that species — see 
Lond. Cat., 1895, 9th ed., p. 44. 
In all these species — or varieties — the leaf seems to be so 
rolled that the right edge comes over the left as the observer 
looks on the upper surface of the lamina 1 . 
Another phenomenon common to all is the reflexion of 
the first leaf soon after the second leaf has unfolded. The 
mechanism of this reflexion has not, I believe, been explained. 
It seems clear from the foregoing that no facts of sufficient 
morphological importance are forthcoming to enable us to 
separate the forms as good species, further than has been 
done on the other botanical characters. Indeed the c seeds ’ 
and seedlings support very strongly the view adopted by 
Bentham that these species and varieties all graduate one 
into the other. 
B. brizaeformis , Fisch and Mey. 
Is a Caucasian and Persian species. It is put in the 
Serrafalcus section by Boissier, a view completely supported 
by examination of the ‘ seeds.’ 
B. brizaeformis is a remarkable form. Its widely spread 
palea and flattened form give it the resemblance to Briza , 
whence the name. Length about 9, breadth 5 mm. There is 
no awn, the membranous, 7-9 veined smooth palea cut into 
lobes at the apex. Colour pale-yellowish, with the large 
flat brown ovate caryopsis shining distinctly. Rachilla short. 
My specimens of B. brizaeformis germinated well, twenty- 
one out of twenty-five having come up on the sixth day, 
B. macrostachys , Desf. 
Occurs in the Mediterranean region, and is placed by 
Bossier near B. brizaeformis , from which it differs in several 
respects in addition to being awned. 
B. macrostachys is a well-marked form with a silky-woolly 
tomentum all over the ‘seed/ and the awn (15-18 mm.) 
arising sub-terminally from the base of two teeth (4-5 mm. 
1 See p. 308 for explanation. 
