56 Rhodora [Marcu 
P. pumila Poir., f. ochroleuca C. A. Weatherby. See RHODORA 
xi. 152-3, 1909. Roadside in dry gravelly soil, Cambridge (M. L. 
Fernald & C. A. Weatherby, May 26, 1909). 
P. recta L. Dry fields and roadsides, occasional. 
P. repTANS L. Lawn of Gray Herbarium, Cambridge (M. L. 
Fernald et al. June 27, 1900 to 1910), Now eradicated. 
P. tridentata Ait. Rocky and sandy places, Plum Island in 
Ipswich, Hamilton, Salem, Gloucester, Rockport, Marblehead, Wil- 
mington. 
PRUNUS. 
P. AMERICANA Marsh. Roadside near house, E. Boxford (J. Robin- 
son, May 5, 1891); roadside escape in dry soil, Halifax (C. H. Knowl- 
ton & A. S. Pease, May 30, 1907). Native from Connecticut south 
and west. ; 
P. avium L. Persistent and spontaneous in many places. 
P. Cerasus L. Small, late-bearing trees between Topsfield and 
Beverly (C. E. Faxon & J. Robinson, May 19, Sept. 3, 1891.) 
P. cuneata Raf. Dry sand and gravel; not reported from south- 
east towns, but frequent elsewhere. 
P. institiT1a L. Found “in the woods near Mt. Auburn ” by Wm. 
Oakes, whose specimen is in the Gray Herbarium, and observed as 
lately as 1913 by Mr. Walter Deane, by the Charles River marsh, on 
the eastern slope of Cambridge Cemetery; Weld Farm, W. Roxbury 
(E. & C. E. Faxon, Aug. 21, 1882 et seq.); “ Holbrook Estate,” 
Percival St., Dorchester (J. R. Churchill, May 19, 1897). 
Emerson in Trees and Shrubs of Massachusetts, 450, 1846, says: 
“A bush or small tree, found on the banks of Charles River, in 
Cambridge, by road-sides at Cohasset, and in other places in the 
vicinity of Boston... . This plant was first pointed out to me by my 
friend E. Tuckerman, and I have since repeatedly met with it.” 
P. Mawates L. South Salem (J. H. Sears, June 15, 1887). Intro- 
duced from southern France in old gardens, and spontaneous. Speci- 
men in herb. Peabody Acad. Sci. 
P. maritima Wang. Dry sandy soil, common on or near the shore; 
it follows up the Merrimac River to Tyngsboro, thirty miles from 
the sea, and from there south to Concord, Billerica and Burlington. 
P. niara Ait. A rare escape from cultivation. 
