STAPHYLEACEAE 205 



Leaf-blades pale or glaucous beneath : lobes coarsely toothed. 



4. A. Saccharum. 

 b. Flowers in terminal racemes or panicles. 

 Flowers in racemes : petals about as long as the sepals : samaras over 2.5 

 cm. long. 5. A. Pennsylvanicum. 



Flowers in panicles : petals twice or thrice as long as the sepals : samaras 

 less than 2.5 cm. long. 6. A. spicatum. 



B. Leaf -blades 3-9-foliolate. 7. A. Negundo. 



1. Acer aaccbarinum L. Silver, or Soft Maple. (Man. p. 607 ; 

 I. F.y. 2372.) Along streams, N. B. toFla., southern Ont., Dak. N. and 

 the Ind. Terr. — Pennsylvania : Monroe ; Northampton ; Bucks ; 

 Chester ; Lancaster ; Allegheny. 



2. Acer rubnim L. Red or Scarlet MaplE. (Man. p. 607 ; I. F. 

 f. 2373-) In swamps and low grounds, N. B. to Man., Fla. and Tex. — 

 Pennsylvania : Tioga ; Lackawanna ; Monroe ; Northampton ; 

 Bucks ; Delaware ; Chester ; Franklin ; Westmoreland ; Alle- 

 gheny. 



3. Acer nigrum Michx. Black Sugar Maple. (Man. p. 608; I. 

 F. /. 2376.) Ont. and Vt. to Ga., Minn., La. and Ark. — Pennsylvania: 

 Northampton ; Huntingdon ; Allegheny. 



4. Acer Saccharum Marsh. Sugar OR Rock MaplE. (Man. p. 607; 

 I. F. f. 237S-) In rich woods, Newf. to Man., south to Fla. and Tex. — 

 Pennsylvania ; Tioga ; Monroe ; Northampton ; Bucks ; Dela- 

 ware; Chester ; Lancaster ; Huntingdon; Somerset ; Erie ; Alle- 

 gheny. 



5. Acer Pennsylvanicum L. Striped Maplh. (Man. p. 608 ; I. F. 

 /. 2378.) In rocky woods, N. S. to Lake Superior, and along the moun- 

 tains to Ga. and Tenn. — Pennsylvania: Bucks; Monroe; Dauphin, 

 Cold Springs ; CENTRE ; Huntingdon ; Blair ; Fayette ; Somer- 

 set. 



6. Acer spicatum Lam. Mountain MaplE. (Man. p. 608 ; I. F. 

 f. 237g.) Damp rocky woods, Newf. and James' Bay to Man., south, 

 especially along the mountains to N. C, Tenn. and Minn.— Pennsylvania : 

 Monroe ; Northampton ; Bucks ; Schuylkill ; York ; Franklin ; 

 Huntingdon ; Berks ; Somerset ; Erie ; Allegheny. 



7. Acer Negundo L. Box ELDER. Ash-lEavEd Maple. (Man. p. 

 60S ; I. F. / 2380.) Along streams, Vt. and Ont. to Man., Fla. and N. 

 Me:K.— Pennsylvania : Northampton ; Bucks ; Chester ; Berks ; 

 Lancaster ; Dauphin; Westmoreland, Allegheny. 



Family 7. STAPHYLEACEAE DC Bladder-nut Family. 

 1. STAPHYLEA L. 



1. Staphylea trifolia L. American Bladder-nut. (Man. p. 606 ; I. 

 F. y. 2371.) In moist woods and thickets, Quebec and Ont. to Minn., 

 S. C. and Kans.— Pennsylvania : Northampton ; Bucks ; Delaware ; 

 Chester ; Montgomery ; Lancaster ; Franklin ; Huntingdon ; 

 Somerset; Allegheny. 



