412 REPORT OF NEW JERSEY STATE MUSEUM. 



think, as he suggests, Q. phellos x Q. ilicifolia. A hybrid be- 

 tween these two is also mentioned by J. E. Peters in Torrey Bull. 

 XX. 295, from Mays Landing. 



Mr. W. T. Davis has described as Q. brittoni a hybrid between 

 Q. marilandica and Q. ilicifolia, from Watchogne, Staten Island 

 (Bull. Torrey Club XIX. 301. 1892). He states that the speci- 

 mens vary greatly, forming a perfect connecting- series between 

 the two. To this category no doubt belong numerous scrub 

 oaks growing on the "Plains" where these two species abound, 

 although I have always been in doubt whether they were not 

 merely extreme types of variation. 



At Medford I found one tree of another hybrid, Q. velutina 

 (or coccinea) and Q. triloba. The leaf outline that of the form^er, 

 with only an occasional tendency toward an elongated central 

 lobe, but with the under side densely gray, pubescent like triloba. 



Several curious chestnut oaks occur at Mullica Hill, Swedes- 

 boro, etc., with very deep acute marginal dentations on the leaves, 

 resembling those of Q. acuminata, but obviously not that species. 



We have also an oak at Riddleton, which has passed for Q. 

 lyrata, but I suspect may be of hybrid origin, though it bears 

 acorns plentifully, as does Q. rudkini. The leaves are similar 

 to lyrata and as white beneath as Q. bicolor. At Pemberton 

 Junction I found a similar tree growing near Q. bicolor, and 

 beside it another with similar leaf outline, but leaves thinner and 

 the downy lower surface dull grayish-green. 



Order URTICALES. 



Family ULMACE^. Elms and Hackberries. 



a. Fruit a winged seed, twigs and trunk not warty. Ulmus, p. 412 



aa. Fruit a drupe, twigs and trunk usually with warty excrescences. 



Celtis, p. 413 



ULMUS L. 



Ulmus americana L. White Elm. 



Ulmus americana Linnaeus, Sp. PI. 226. 1753 [Virginia]. — Knieskern 27. — 

 Britton 216. 



Low ground, especially along rivers ; comm^on in the Northern 

 district and less abundant southward in the Middle district. 



