134 
(14-114 inches) long, blades 8-16 em. (38-6 inches) long, sometimes 
almost as wide, usually 3-lobed, rarely 5-lobed, size and position of 
the lobes very variable, sometimes the margin is only undulate- 
lobed, generally only shallow lobed, the 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 
em. (14-34 inch) long, usually puberulent near the apex, sometimes 
smooth, the inside of the shell covered with brown woolly hairs, nut 
enclosed from 1/3-1% 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. 
ULMACEZ. Tue Exo Famtry. 
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 
oftheseason, iruit a drupessaeeae eee ae eee ee 2 Celtis. 
