PLANTS OF SOUTHERN NEW JERSEY. 411 



down with the abundance of acorns. It is frequently only two 

 feet in height, and rarely more than four. 



Fl. — iMid-May to late May, when the leaves are partly ex- 

 panded. Fr. — Autumn of the first season. 



Middle District. — Farmingdale, New Egypt (NY), Birmingham, Locust 

 Grove (S), Gloucester, W. Deptford, Swedesboro, Bridgeton (NB), Clarks- 

 boro (UP), Mickleton (UP). 



Pine Barrens. — Toms River (NB), Edge of E. Plains (S), Speedwell (S), 

 Chatsworth, Applepie Hill (S), Tabernacle (S), Clementon (S), Landis- 

 ville, Hammonton, Mays Landing (S), Absecon (S). 



HYBRID OAKS. 



Besides exhibiting- a great range of variation oaks hybridize 

 readily and perplexing forms are constantly presenting them- 

 selves. 



One of the most famous hybrids is the Bartram Oak, Q. hcte- 

 rophylla Michaux f. (Hist. Arb. Am. II. 87. 18 12) originally 

 from the vicinity of Bartram's residence below Philadelphia. 

 This tree is frequent throughout West Jersey, south to Cape 

 May. Specimens have been examined as follows : 



Middle I^w^nV;.— Farmingdale, New Egypt, Arneys Mt. (S), Millville (S). 

 Cape May. — Green Creek, New England (OHB), Bennett. 

 Coast Strip. — Manahawkin. 



While Q. phellos is one of the parents of this form the other is 

 in doubt. It has usually been given as Q. rubra, but that is cer- 

 tainly not the case in New Jersey, and it seems more likely to be 

 Q. coccinea or Q. vehitina, which are fairly plentiful, while Q. 

 rubra is extremely rare. Perhaps the so-called Q. heterophyUa is 

 not all of similar origin. Some specimens somewhat pubescent 

 below may easily be Q. phellos x triloba. 



An oak with larger, irregularly toothed leaves is Q. nidkini 

 Britton (Bull. Torrey Club IX. 13. 1882— Keyport, N. J.) sup- 

 posed to be a cross between Q. phellos and Q. marilandica. This 

 I have seen from 



Middle District.— Keyport, Cliffwood, Mickleton, Medford (S), Swedes- 

 boro, Tomlin, Salem (S). 

 Cape May. — Green Creek. 



Between this and the preceding there is no very sharply de- 

 fined line. 



A narrow-leaved, irregularly lobed form collected near Wood- 

 bury by Mr. Isaac Burk, has the leaves white beneath, and is, I 



