844 



UKTICACEAE (NETTLE FAMILY) 



688. Q. marilandica. 



cised or sinuate-pinnatifid (then mostly 



bristle-pointed). Fig. 687. 



20. Q. marilandica Muench. (Black 



Jack or Barren U.) Leaves broadly wedge- 

 shaped, but sometimes rounded or obscurely 



cordate at the base, widely dilated and 



somewhat 8 (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 south w. — 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 I., N. Y. to Fla., w. to Ky., 



Mo., and Tex. Fig. 690. Var. laurif6lia (Michx.) 



Chapm. (Laurel 0.) Leaves oblong, usually larger. {Q. 



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



699. 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 \(rarely 2)-celled 

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

 any, its radicle pointing upward; stamens 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. ^LMEAE. Flowers mostly polygamous, upon the last year'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 branchep 

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



-S. Celtis. Ovary 1-ovuled. Flowers appearing with the leaves. Leaves 3-nerved at base. 



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



clusters or ciitkiiis. thi* I'alyx of one sei)al ejnbracing the ovary. Filaments short, erect in the 

 bud. Stigmas 2, elongated. Ovary 1-celled, with a pendulous ovule, forming a small glandular 



