FLORA OF WASHINGTON AND VICINITY. 113 



tQuercusMichauxii, Nutt. Miciiaux's Oak. 



There is little doubt that this species occurs here, though it has not yet been 

 clearly distinguished. Forms of the preceding with leaves nearly destitute of white 

 color underneath are common and have been referred to it by Dr. Engelmann, though 

 not typical. At Great Falls, on the Virginia side, are trees appearing to be normal, 

 but neither fruit nor flowers have yet been collected. At Hampton, Va., I saw it well 

 defined. It has the obovate, sinuate leaves, regular in outliue but not lobed, of the 

 upland form of Q. Prinus, and the smooth, light-colored bark of Q. bicolor. 



tQuercus Prinus, L. Chestnut-Oak. Rock Chestnut-Oak. 



Two forms; an upland typical form, and a narrow leaved form growing on rocks 

 near the river. First week in May ; fruit, first of September, early dropping. 



Quercus Muhlenbergii, Eng. \_Qiicrciis I'ruiits, L., var. acuminata, Michx.] Yellow 

 Chestnut-Oak. 

 A few trees along Rock Creek, near the mouth of Broad Branch ; also a tree dis- 

 covered by Dr. Vasey, near the District line, above Chain Bridge. This bears fruit, 

 which, however, tends to abort and produce monstrosities. Some of the leaves 

 also have nearly the form of Q. Prinus, and I strongly suspect it to be a hybrid. 

 Last of April or first of May ; fruit, September. 



Quercus prinoides, Willd. Dwarf Chestnut-Oak. Chinquapin-Oak. 

 Reform School. Second week in May ; fruit, September. 



Quercus rubra, L. Red Oak. 



First wiH'k in May; fruit, October. 



tQuercus coccinea, Wang. Scarlet Oak. 



First week in May ; fruit, last of September or tirst of October. 



tQuercus tinctoria, Bartram. [Q. coccbira, Wang., var., tincforia, Gray.] Black 

 Oak. Yellow-barked Oak. Quercitron. 

 Following Sargent, I prefer to restore the time-honored name of Bartram for this 

 species. Last week in April ; fruit, first of October. 



tQuercus falcata, Michx. Spanish Oak. Turkey-Oak. 

 Last of April or first of May ; fruit, first of October. 



Quercus ilicifolia, Wang. Bear-Oak. Black Scrub-Oak. 



The claims of this species to a place in this catalogue are rather slender. A 

 few specimens of the leaves, unaccompanied by acorns, were brought from the vicinity 

 of Cabin John Run by Major Nutt of the Treasury Department in 1855, who sent them 

 to Dr. E. Foreman, by whom they were deposited in the herbarium of the Department 

 of Agriculture, where they may still be seen. Mr. Wm. Palmer is said to have col- 

 lected it within a few years, also without fruit, in the vicinity of Falls Church, but 

 his specimens have been sent away and are iDot accessible. It is to be hoped that it 

 will now be re-discovered. 



tQuercus palustris, Du Roi. Swamp Spanish Oak. Pin-Oak. 

 Second week in May; fruit, first of October. 



t Quercus nigra, L. Black-Jack. Barren Oak. 

 First of May; fruit, last of September. 



Quercus imbricaria, Michx. Shinglk-Oak. Laurel-Oak. 



Trees sometimes large, but dwarf form 2'" to G'" high is common. First week in 

 May; fruit, first of October. 



Bull. Nat. Mus. No. 22 8 



