244 ENGLISH BOTANY. 



osier-beds in many places; this is the only form I know of occurring 

 80 far south. Local in Ireland. 



England, Scotland, Ireland. Shrub. Late Spring and early Summer ; 

 sometimes again in late Summer. 



S. nigricans is as variable a plant as S. phylicifolia, and runs through 

 nearly a parallel series of variations. It is sometimes only 1 foot high, 

 at other times 10 or 12 feet. The leaves also vary much, both in form 

 and size, being sometimes little more than 1 inch long, at others 2 or 

 3 inches, or even more. The points in which it diflfers from S. phylici- 

 folia are the thinner texture of the leaves, which have the veins more 

 impressed above and more prominent beneath, their colour darker 

 above and less intensely glaucous beneath, both sides often retaining 

 their hairiness for a longer period; the young branches and young 

 leaves are more thickly pubescent ; the stipules are more often present, 

 and always larger ; the leaves, especially when young, have a greater 

 tendency to turn black in drying ; the capsule is more often glabrous, 

 with a shorter style and longer pedicel. 



S. floribunda [Forbes) is a doubtful plant, of which the female seems 

 to be unknown, but the thin haiiy leaves and large stipules indicate that 

 it is a form of S. nigricans rather than of S. phylicifolia, to which Dr. 

 Walker- Amott is inclined to refer it. 



Dark-leaved Sallow, 

 French, Saule noircissant. German, Schivarzwerdende Weide. 



Group III.— INCUBAC^. Linn. 



Style short ; stipules linear. 



Small shrubs, with the pubescence of the leaves usually silky. 



SPECIES (?) XXin.— S ALIX AMBIGUA. Ehrh. 



Plate MCCCLV. 



Beich. Ic. Fl. Germ, et Helv. Vol. XI. Tab. DXCII. Fig. 1243, b, and 1243, c. 

 Anders. Mon. Sal. p. 117. Borrer, in Engl. Bot. Suppl. No. 2733. HooJc. Brit. Fl. 



ed. iv. p. 361. HooJc. & Am. Brit. Fl. ed. viii. p. 404. Bab. Man. Brit. Bot. ed. 



vi. p. 314. 

 S. anrita-repenB, Wimm. Sal. Europ. p. 233. 



Leaves oblong-obovate or -oblanceolate or -oval or -elliptical, with a 

 short recurved point, faintly crenate-serrate or serrate, sometimes 

 nearly entire, rugose, from the veins being impressed above and 

 prominent beneath, dark green, shining and subglabrous, or grey or 

 hoary and pubescent above ; subglabrous and glaucous or more often 

 clothed with silky or cottony hairs beneath. Stipules small, subsessile, 



