ACEBACEAE. 217 



Family 7. STAPHYLEACEAE DC. Bladder-nut Family. 



1. STAPHYLBA L. 

 1. Staphylea TRiFOiiiA L. BlaMer-Mii. M. p. (306. Thickets in moist 

 soil. Spring. ; 



Family s. ACERACEAE St. Hil. Maple Family. 



1. ACER L. Maple. 



Leaves simple, palmately lobed. 



Flowers in dense, sessile, lateral clusters, unfolding before the leaves. 

 Petals none ; ovary tomentose ; samaras divergent. 



1. A. saccharinum. 

 Petals present ; ovary glabrous ; samaras incurved. 



2. A. rubrum. 

 Flowers corymbose, unfolding with the leaves. 



Leaves pale and nearly glabrous beneath. ',i. A. Saecharum. 

 Leaves green and pubescent, at least on the veins beneath. 



4. A. nigrum. 

 Flowers racemed, terminal, unfolding after the leaves. 



Racemes drooping; leaves finely serrate. 5. A. Pennsylvanicum. 

 Racemes erect ; leaves coarsely serrate. 6. A. spicatum. 



Leaves pinnate. 7. A. Negundo. 



1. Acer saccharinum L. White or Silver Maple. M. p. 607. Common in 



cultivation; also river banks. Early spring. 



Delaware — Chad 's Ford along Brandywine (B. Sm.). Dauphm — 

 Steelton (Wn.). 



Mercer — Above Trenton along the Delaware (He.). 



New Castle — Brandywine Creek above Washington street, both north 

 and south side. 



2. Acer rubrum L. Red or Sivamp Maple. M. p. 607. Swamps and low 



grounds. Early spring. 



3. Acer saccharum Marsh. Sugar or Rock Maple. M. p. 607. Rich 



woods. Spring. 



Buds— Argus (Cr.), Sellersville (Fr.), Solebury Twp. (Ws.). Mont- 

 gomery— Sumney town (VP.). Delaware— Valley of Darby Creek (B. 

 Sm.). Chester— Fhcenbiville, Mart. CB.C). Lancaster— (F.). Lehigh— 

 Lehigh Mountain (Kr.). Northampton— 'Easton, Porter (B. C). Dau- 

 phin — Harrisburg ( Wn. ) . 



ilfercer— Princeton, Trenton (C). 



New Castle — Rockland, Guyanconrt. Rare. 



4. Acer nigrum Michx. Black Sugar Maple. M. p. 608. Rich soil. 



Spring. 

 Bucks— 'Rock Hill (Fr.). Lancaster— Feach Bottom (Ca.). North- 

 ampton — (P.). 



Hunterdo7i—Ijocktown (C). 



5. Acer Pennsylvanicum L. Striped or Goosefoot Maple. M. p. 608. 



Rich, rocky woods. Spring. 

 Bucks— (F.). Montgo7nery— Mill Creek (Ha.). Delaware— Fainters' 

 Arboretum (He.). Berks— HamhuTg (Li.), Blue Ridge (Sch.). Dau- 

 phin-Cold Springs (P.). 



