344 



URTICACEAE (NETTLE FAMILY) 



688. Q. marilandica. 



cised or sinuate-pinnatifid (then mostly 



bristle-pointed). FIG. 687. 



20. Q. marilandica Muench. (BLACK 



JACK or BARREN O.) Leaves broadly wedge- 

 shaped, but sometimes rounded or obscurely 



cordate at the base, widely dilated and 

 somewhat 3 (rarely 

 5)-lobed at the 

 summit, occasionally 

 with one or two 

 lateral conspicuously 

 bristle-tipped lobes 

 or teeth, rusty-pubes- 

 cent beneath, shin- 

 ing above, large, 

 1-2.5 dm. long. (Q. 

 nigra Man. ed. 6, 

 not L.) Dry sandy 



barrens, or heavy clay soil, L. I. to s. Minn., e. Neb., 

 and southw. A small tree of little value. FIG. 688. 



21. Q. imbricaria Michx. (LAUREL or SHINGLE O.) 

 Leaves lanceolate or lance-oblong, 

 thickish, smooth and shining above, 

 downy beneath, the down usually 

 persistent; cup between saucer- 

 shaped and top-shaped. Rich wood- 

 lands, Pa. to Ga., w. to s. Wise., e. 



Neb., and Ark. ; locally, e. Mass. (Kennedy). Tree 8-27 m. 



high. FIG. 689. 



22. Q. phellos L. (WILLOW O.) Leaves linear-lanceo- 

 late, narrowed to both ends, soon glabrous, light green 



(about 1 dm. long) ; cup saucer-shaped. Bottom-lands or 



rich sandy uplands, Staten L, N. Y. to Fla., w. to Ky., 



Mo., and Tex. FIG. 690. Var. LAURir6LiA (Michx.) 



Chapm. (LAUREL O.) Leaves oblong, usually larger. (Q. 



laurifolia Michx.) N. J. to Fla. and La. 690. Q. phellos. 



639. Q. imbricaria. 



URTICACEAE (NETTLE FAMILY) 



Plants with stipules, and monoecious or dioecious or rarely (in the Elm Tribe) 

 perfect flowers, furnished with a regular calyx free from the l(rarely ^-celled 

 ovary which forms a 1-seeded fruit ; the embryo in the albumen when there is 

 any, its radicle pointing upward; stamen* as many as the lobes of the calyx and 

 opposite them, or sometimes fewer. Cotyledons usually broad. Stipules often de- 

 ciduous. A large family (far the greater part tropical). 



Tribe I. fJLMEAE. Flowers mostly polygamous, upon the last rear's branches. Anthers erect 

 in the bud, extrorse. Styles or stigmas 2. Seed suspended. Embryo straight Trees, with 

 alternate serrate pinnately veined leaves and fugacious stipules. 



1. Ulmus. Ovary 1-2-ovuled. Fruit winged all around. 



2. Planera. Flowers appearing with the leaves. Ovule one. Fruit wingless, nut-like. 



Tribe II. CELTfDEAE. As in Tribe I., but the monoecious-polygamous flowers upon branches 

 of the same year. Anthers introrse. Fniit a drupe. Embryo curved. 



8. Celtis. Ovary 1-ovnled. Flowers appearing with the leaves. Leaves 8-nerved at base. 



Tribe III. CANWABfNEAB. Flowers dioecious ; the sterile racemed or panicled ; the fertile in 

 clusters or catkins, the calyx of one sepal embracing the ovary. Filaments short, erect in the 

 bud. Stigmas 2, elongated. Ovary l-c<lled, with a pendulous ovule, forming a small glandular 



