S'i'A'ri<: BoAiiD of FoRESTui. 211 



(/^-IM inches) long, blades 8-1 G cm. (3-6 inch(!s) long, sometimes 

 almost as wide, usually 3-lobed, rarely r)-lobe(l, size and position of 

 the lobes very variable, sometimes th(; margin is only undulate- 

 lobed, generally only shallow lobed, tlu^ primary veins indicate the 

 lobes and terminate in a bristle, very hairy when they expand, be- 

 coming very thick at maturity, smooth, shiny and a deep green 

 above, paler or a yellow-brown beneath, with a coat of brown hairs, 

 or sometimes smooth or nearly so late in the fall; acorns solitary or 

 in pairs, sessile or nearly so; nut depressed ovoid or sub-globose, 1-2 

 cm. (}^-% inch) long, usually puberulent near the apex, sometimes 

 smooth, the inside of the shell covered with brown woolly hairs, nut 

 enclosed from l/B-J/^ its length in the depressed hemispheric cup 

 which is more or less hairy within; scales blunt, light or reddish- 

 brown, thickly covered with hairs, not closely appressed, those 

 near the top of the cup rather loose. 



Distribution. New York to Nebraska, south to Florida and west 

 to Texas. Known definitely from southern Indiana only. It is be- 

 lieved that in its distribution in this state it is confined to the south- 

 ern and southwestern part of the State, where it is usually associ- 

 ated with the post oak {Quercus stellata) on the tops and sides of 

 sterile hills. W. B. Van Gorder has noted it in isolated colonies 

 in a few places in Greene County, remarking that '^the trees are of 

 all sizes up to 3 dm. (12 inches) in diameter." In our area the 

 black jack is a small gnarly tree seldom attaining a height of 9 m. 

 (30 feet) or a diameter of 3 dm. (12 inches). 



The published records of the distribution are as follows: Clark 

 (Baird and Taylor) and (Smith); Fountain (Brown); Gibson (Ridg- 

 way) and (Schneck); Knox (Thomas); Posey (Ridgway) and 

 (Schneck). 



Additional records are: Clark and Crawford (Deam); Greene 

 (Van Gorder); Knox (Blatchley); vicinity of New Albany (Clapp). 



Economic uses. Too rare to be of any economic importance. 



ULMACE^. The Elm Family. 



Trees with watery juice; buds scaly; leaves alternate, simple, 

 serrate, 2-ranked, pinnately-veined ; fruit a samara or drupe. 



Leaves with primary veins parallel; flowers borne on the 



twigs of the preceding season; fruit a samara 1 Ulmus. 



Leaves 3- veined at the base; flowers borne on the twigs 



of the season, fruit a drupe 2 Celtis. 



