106 Rhodora [JUNE 
REPORTS ON THE FLORA OF THE BOSTON 
DISTRICT,— XIX. 
SALICACEAE. 
POPULUS. 
P. ALBA L. Roadsides and waste land; escaping freely wherever 
planted, especially along the coast. 
[P. balsamifera L. Cultivated (?), Danvers (C. E. F axon, May 19, 
1884).] 
P. cANDICANS Ait. Escaping occasionally, wherever planted. 
P. peLTOIDEs Marsh. Introduced from further west; spontaneous 
at Lowell, Cambridge and Walpole, perhaps elsewhere. 
P. grandidentata Michx. Woods and roadsides, common 
throughout. 
P. NIGRA L., var. rrALICA Du Roi. Occasionally persistent around 
old places, sometimes escaping. 
P. tremuloides Michx. Woods and roadsides, very common 
throughout. 
SALIX. 
S. ALBA L. Introduced and escaping at several stations. 
S. ALBA L., var. CAERULEA (Sm.) Koch. Sparingly escaped in 
Middlesex Fells, Boston and Wellesley. 
S. ALBA L., var. vITELLINA (L.) Koch. Often planted, and thor- 
oughly established, spreading in moist soil; pistillate trees very rare. 
S. AURITA L. Waste ground off Ipswich St., Back Bay, Boston 
(F. F. Forbes, 1905). Native of Europe and northern Asia. 
S. BABYLONICA L. Waste places, sparingly escaped around Boston. 
S. candida llügge. Abundant in a swamp near Crooked Pond, 
Boxford. First found by J. Robinson in 1875. One of several rare 
plants growing in this isolated limestone area. 
S. cordata Muhl. Thickets and swamps, common throughout. 
S. cordata Muhl., var. angustata (Pursh) Anders. Ice railway, 
Cambridge (Wm. Boott, May 18 and June 13, 1854); wet bank, 
W. Cambridge (M. L. Fernald, no date). 
