S. tomentosa L. Hardback, Stecplo-busli. 



Common and of wide distribution in Xew Hampsliirc at low elevations; i>astur€S 

 and open low ground: forma alhiflora Macbr. witli white flowers bas been collected 

 in Alstead and Wentwortb : Rhodora 17:143, 1915. 



Sorbaria sorbifolia fL.) A.Br. False Spiraea. 



Frequently spreading to roadsides from cultivation and persisting around cellar- 

 boles and along roadsides and fence-rows : introduced from Asia. 



Pyrus communis L. Pear. 



Occasional escape in soutbeastern New Hampsbire, occurring along or near shores 

 cf Great Bay ; one collection from Hanover : introduced from Eurasia. 



P. Malus L. Apple. 



Often too frequent as an escape into old fields and pastures, sometimes persisting 

 ir. new woods ; general throughout, near farms or in formerly settled areas : introduced 

 from Eurasia. 



P. arbutifolia (L.) L.f. Red Cliokeberry. 



Rare escape, spreading from iplanted specimens in l)urbani; iiitrinluced truni far- 

 ther south. 



P. floribunda Lindl. Puri)lc Cbokelierry. 



Common in central and southern New Hampshire becoming infrequent in Coos 

 County, widely distributed at low and middle elevations : swamps, ledges, and dry 

 thickets, with preference for wet situations: Rhodora 4:55-57, 1902. 



P. melanocarpa (Miclix. ) Willd. Black Cliokeberry. 



Common and generally distributed at low and middle elevations up to v^,5()() feet; 

 same habitats as above, but more often in dry places, chiefly in onen situations : hybrids 

 with P. floribunda often occur when the parents are in proximity. 



P. americana (Marsh.) DC. American Mountain-Ash. 



Common in northern New Hampshire ; ascending to tree-line ; abundant in areas 

 of recent windfall and lumbering, also on rocky ridges and in lowlands along borders 

 of streams and in cool woods; frequent at middle altitudes in central and southern 

 New Hampshire, occasional in lowlands : hybrids with both P. florihiDida and P. 

 melanocarpa may be expected but none have been collected in New Hampshire ; pro- 

 bably also hybridizes with P. decora since many specimens are intermediate in 

 character. 



P. decora (Sarg. ) Hyland var. decora. Mountain- Ash. 



Common in northern New Hampsbire in same habitats as foregoing; outlying 

 stations in Concord, Springfield and Grantham. 



Var. groenlandica (Schneid.) Fern. 



Dwarfed specimen from Mt. Monroe seems to belong here. 



Amelanchier (Shadbush, Juneberry, Serviceberry) is a difficult genus with much 

 hybridization, exhibiting great variation especially in disturbed habitats. The speci- 

 mens of A. Wicgandii from New Hampshire have much finer leaf teeth than is in- 

 dicated in the key and description in Gray's Manual ed. 8. 



Amelanchier sanguinea (Pursh.) D.C. 



Occasional on river-ledges and banks: apparentlv with calcareous affinities; along 

 the Connecticut River and Great Bav shores in Strafford County; outlying station 

 in Sutton : may hybridize locally with other species in vicinity. 



A. Wiegandii Nielsen. 



Occasional ; all of collections are from Coos and northern Grafton counties with an 

 outlying station at Plainfield : further study of this taxon needed in New Hampshire. 



28 



