242 Ward —On Relations detween Host and Parasite 
Outer palea shortly awned, the upper very finely ciliate on 
the ridges : — e. g. B. erectus , Huds., B. inermis , Leyss., B. asper i 
Murr., B. ciliatus , L. 
(2) Stenobromus . Low annuals, with narrow spikelets 
broadening upwards. Glumes as in (1). Lower palea keeled, 
long-awned ; the upper stiffly ciliated. Weeds, e. g. B. tec to- 
rum , L., Z?. sterilis , L., B. madritensis , L., Z?. maximus , Desk, 
Z?. giganteus , L. 
(3) Zeobroma (Serrafalcus). Annuals with ovoid or lanceo- 
late spikelets narrowing upwards. Outer glume 3-5-, inner 
5-7-nerved. Lower palea 7-9-nerved, and keelless ; awn 
often spreading, rarely obsolete. Upper palea stiffly ciliate, 
e. g. A. brizaeformis , Fisch. and Mey., Z?. macros tacky s 3 Desk, 
Z?. secalinus , L., Z?. arvensis , L., 5 . mollis 3 L., Z?. racemosus , L. 
(4) Liber tia. As Zeobromus, but the outer palea with two 
lateral projections. Z?. arduennensis 3 Kunth. 
(5) Ceratochloa, Spikelets lanceolate, compressed. Glumes 
and paleae many nerved, keeled ; ovary evidently 3-humped, 
e. g. A. unioloides , Kunth. 
Of these I have made a more or less thorough examination 
of the following representatives. In the following notes on 
the 1 seeds 5 and seedlings the British forms are marked with 
an asterisk. It should be borne in mind that these notes are 
only intended to indicate the plants I have been using; 
materials are being accumulated for a more comprehensive 
treatment of the whole genus on which I am engaged 1 . 
(1) Festucoides. 
*B. erectus , Huds. B. inermis , Leyss. 
*B. asper 3 Murr. B. ciliatus , L. 
B. erectus , Huds. 
A native of Europe and Asia Minor and N. Africa, is 
essentially a dry meadow species, and is scattered but not 
uncommon throughout the chalk districts of Cambridge. It 
1 I am glad to take this opportunity of thanking Mr. Lynch, the Curator of the 
Botanic Garden, for the trouble he has taken in germinating and growing in pots 
for me many species of Bromes. 
