54 ELEMENTS OF BOTANY. 



7. Q. MINOR (]Marsh) Sarg. Post Oak. A tree of medium 

 size, with rough, gray bark ; leaves broadly obovate, deeply lyrate- 

 pinnatifid into 5-7 rounded, divergent lobes, upper lobes much 

 the longer, smooth above, tomentose beneath, petioles about 1 in. 

 long; cup hemispherical, nearly sessile; acorn ovoid, 2-3 times as 

 long as the cup. March-April. On dry soil; wood hard and 

 valuable. 



8. Q. LYRATA Walt. Swamp Oak. A large tree with gray or 

 reddish bark, leaves obovate-oblong, deeply pinnatilid, lobes narrow, 

 often toothed, thin, glabrous above, white tomentose beneath ; cup 

 round-ovate, scales cuspidate, enclosing nearly the whole of the de- 

 pressed-globose acorn. March- April. On wet soil ; wood strong and 

 very durable. 



9. Q. PRiNUS L. Swamp Chestnut Oak. A large tree, with 

 brown, ridged bark ; leaves oblong or oblong-lanceolate, rather ob- 

 tuse, crenately toothed, minutely downy beneath, petioles slender, 

 about 1 in. long ; cup hemispherical, peduncles longer than the 

 petioles, scales acute, tubercular, appressed ; acorn oblong, acute, 

 1 in. or less in length, edible. March-April. Common on low 

 ground. Wood strong and valuable. 



10. Q. ACUMINATA (Michx.) Sarg. Yellow Chestnut Oak. 

 A tree of medium or large size with gray bark, leaves oblong or 

 oblanceolate, usually acute at the apex and obtuse or rounded at the 

 base, coarsely and evenly toothed ; veins straight, impressed above 

 and prominent beneath ; petioles slender ; cup hemispherical, sessile 

 or short-peduncled, with flat scales, ^ in. broad, enclosing about half 

 the ovoid acorn which is |-| in. long. March-April. Common on 

 dry soil ; wood close-grained, durable, and valuable. 



11. Q. ViRGiNiANA Mill. Live Oak. A large tree with rough 

 gray or brown bark and a low spreading head ; leaves coriaceous, 

 evergreen, oblong or oblanceolate, often somewhat 3-lobed on young 

 trees, margin revolute, dark green and shining above, pale below ; 

 petioles short, stout ; fruit often in short racemes, cup top-shaped, 

 scales closely appressed, hoary, peduncles ^-1 in. long ; acorn from 

 subglobose to oblong, the longer form occurring on the younger 

 trees. March- April. On low ground near the coast ; wood very 

 hard and durable ; valued for ship-building. 



26. ULMACEiE. ELM FAMILY. 



Trees or shrubs with watery juice, alternate, simple, petio- 

 late, serrate, stipulate leaves which are usually 2-ranked ; and 

 small, perfect or polygamous, apetalous flowers ; calyx of 3-9 



