328 
S. Reginald Price. 
4; Lydd, Kent 15; Yarmouth, Norfolk, E. 27; Tenby, Pembroke 
45; Holyhead, Anglesea, 52; Holy Isle, 67; Kinross, Fife, 85; 
Sands of Barry, Forfar 90; Kishorn, W. Ross 105; Betty Hill, 
Sutherland 107 ; North Bull, Dublin; Newcastle, Co. Down. 
Four Alien plants not in my List of British Plants were also 
gathered on the Excursion, viz., Saponaria orientalis L., an eastern 
species introduced with other Aliens at Galway Bay: Populus 
laurifolius Ledeb., the remains of cultivation in the Earl of 
Dartmouth’s grounds at Woodsome Hall, near Huddersfield, Yorks; 
Tritonia crocosmiflora Nicholson, a garden hybrid rapidly becoming 
naturalised in Western Ireland; and the variety of the Violet 
Willow, Salix daphnoides Vill. var. pomeranica (Willdenow), which is 
evidently planted at Southport. The last was identified by 
Professor Graebner. 
G. CLARIDGE DRUCE. 
THE ROOTS OF SOME NORTH AFRICAN 
DESERT-GRASSES. 
By S. Reginald Price, B.A. 
(University Frank Smart Student in Botany, and late Scholar 
of Clare College , Cambridge). 
[With Plate VI. and Two Figures in the Text.] 
HE Grasses whose root structure is dealt with here, all come 
under a general type, and all live in extreme conditions of 
aridity in the North African Deserts. A detailed study of the 
internal anatomy has been possible in one case, that of Aristida 
pungens, while a few other species are considered in relation 
to this type. 
I. ARISTIDA PUNGENS, DESF. 
Aristida pungens, Desf. 1 grows abundantly in North Africa, 
and is also distributed in Arabia, Turkestan, Siberia, 2 &c. —that 
is to say it is a desert grass. The genus Aristida, characterised 
by a three-branched awn of which one branch is plumed, is allied to 
the genera Stipa and Amphopogon, and also to Alopecurus and 
Phleum of the British Flora, all being included in the tribe 
Agrostidese. 3 
1 Desfontaine. Flora Atlantica, Paris, 1800, Tome I., p. 109 and 
Tome III., fig. 35. 
2 Index Kewensis, Fasc. 1, p. 187. 
3 Hackel, in Engler’s Pflanzenfamilien II., 2, Gramineae, pp. 44 
and 45. 
