544 REPORT OF NEW JERSEY STATE MUSEUM. 



ACER L. 

 Acer saccharinum L. White Maple. 



Acer saccharinum Linnaeus, Sp. PI. 1055. 1753 [Pennsylvania].— Britton 78. 



Common along the upper Delaware River, and sparingly 

 southward within our limits. Frequently introduced as a shade 

 tree. 



Fl. — ^Mid-March to early April. Pr. — Early May to late 

 M'ay. 

 Middle District. — Delair. 



Acer rubrum L. Red Maple. 



Acer rubrum Linnasus, Sp. PI. 1055. 1753 [Virginia and Pennsylvania]. — 

 Knieskern 11. — Britton 78. 



(Moist woodland; commion in the Niorthern and parts of the 

 Middle districts. 



The Red Maples of our region are puzzling in their variability. 

 We have a form with very small, three-lobed leaves, usually 

 tomentous beneath, which is cominion in the Pine Barrens, which 

 I have referred to carolinianum, while through the Middle dis- 

 trict there is a tree with rather larger leaves, rarely tomentose, 

 which may be referable to true rubrum. Some trees in the 

 uplands of Pennsylvania are similar, but others, with large, 

 five-lobed leaves, very white and glabrous below, are quite dif- 

 ferent. The division of specimens given below is arbit?&.ry, 

 but the difference between the extremes is striking. 



PL — 'Late March to mid- April. Pr. — ^Early May to late May. 



Middle District— Nevf Egypt, Medford (S), Springdale (S), Salem (S)- 



Acer rubrum carolinianum (Walt.). Carolina Red Maple. 



Acer carolinianum Walter, Fl. Cor. 251 [S. Carolina]. 



Comtnon throughout the Pine Barrens and on the Coast strip. 

 Fl. — Late March to mid- April, i^r.— -Early M'ay to late May. 



Middle District. — Farmingdale, Birmingham, Pemberton Jnc. (S), Borden- 

 town, Haddonfield (S), Merchantville, Yorktown. 



Pine Barrens. — Toms River, Bear Swamp, Speedwell, Pleasant Mills (^). 



Coast Strip.— Ft. Pleasant, Seaside Park (S), Surf City (L), Sherburn's 

 (L), Ocean City (S), Piermont (S). 



