QUERCUS MARILANDICA Muenchhausen. Black Jack Oak. (× 1/2.)
Distribution.—New York to Nebraska, south to Florida and west to Texas. In Indiana it is known to the author from Sullivan, Greene and Clark Counties and southwestward. It has been reported from Jefferson County by Barnes which is no doubt correct. Doubtful records are those by Brown for Fountain County, Miami County by Gorby, and Phinney's report for the area of Delaware, Jay, Randolph and Wayne Counties. It has been reported for the vicinity of Chicago by Higley and Raddin. It may be local on sterile, sandy ridges of the northern part of the State, but very local if it does occur. It is generally found in very poor soil on the crest of ridges associated with black and post oak. However, it has been found in Greene, Sullivan and Knox counties on sand ridges and at the base of sand ridges associated with black and post oak. The species has a very limited mass distribution and is only occasionally found and in colonies of a few trees each.
Remarks.—Trees too small and scarce to be of any economic importance.
ULMÀCEAE. The Elm Family.
Trees or shrubs with simple, alternate, 2-ranked, petioled leaves; sepals 3-9, petals none, stamens as many as the sepals and opposite them, stigmas 2.
| Branchlets with solid pith; leaves with primary veins parallel; flowers borne on the twigs of the preceding season | 1 Ulmus. |
| Branchlets with chambered pith at the nodes; leaves 3-veined at the base; flowers borne on the twigs of the season | 2 Celtis. |
Trees with furrowed bark; leaves short petioled, with lateral veins prominent and parallel, oblique or unequally heart-shaped at the base, taper-pointed at the apex, mostly double-serrate; flowers of Indiana species expanding before the leaves in March or April; fruit a samara surrounded with a wide membranous margin, maturing in the spring.