306 ORDER 122. CUPULIFEILE. 



7 Q,. triloba MX. Downy Black- Jack. Tree of rapid growth, 20 30f; leaves oblong- 



cuneiform, acute at base, rusty-tomentous beneath; lobes at apex often toothed, 

 bristle-pointed ; nut depressed. Barrens, N. J. to Fla. 



8 Q. Catesbaei MX. Turkey O. Tree 20 25f ; leaves large, very irregular, glabrous, 



cuneate at base, lobes deep, narrow, with bristle-pointed, divaricate teeth ; cup large, 

 half covering tbe ovoid, mealy nut. Barrens, South. 



9 Q. Illclfelia Wang. Scrub 0. Bear O. Shrub 3 7f, straggling ; Ivs. petiolate, obo- 



vate, angularly 5-(3-7-)lobed, 3 4', whitish-downy beneath ; acorn small (56"), cup 

 very shallow. Barren tracts : common. Animals feed on the acorns. 

 /3. Georg-iana. Leaves smaller and smoother, of the same form, on Stone Mt. ! 



10 Q. rubra L. Red 0. Tree 50 70f, wide and high ; leaves long-stalked, glabrous, 

 sinuses rounded, shallow, lobes 79, with bristle-pointed teeth ; acorn 1', ellipsoid, 

 J immersed in the shallow cup. Wood reddish, coarse : common. 



11 Q. palustrls MX. Pin 0. (Figs. 1-4.) Sinuses deep and broad, lobes oftener 5. 

 petioles long (12'), toothed as in Q. rubra ; acorns 7 8" ; nut i immersed in the 

 cup. Tree GO 80f, with a light open foliage, in wet, cool soils. 



12 Q. falcata L. Spanish 0. Tree 60 70f ; Ivs. long-stalked, obtuse at base, ashy- 

 tomentous beneath, lobes 57, narrow, simple or toothed, more or less falcate ; corn 

 globular, 45", in a shallow sribsessile cup. Va. to Fla. 



13 Q. coccinea Wang. Scarlet 0. Trees very large (80f) ; Ivs. much like Q. rubra, 

 but changing to scarlet in Autumn, while that becomes red-brown ; acorn 7 8", nut 

 4 \ immersed in the cap. In young shoots the leaves almost lose their lobes and 

 teeth, but keep their bristles. Not rare. 



/3. linctoria. Black 0. Leaves oftener obovate in outline ; bark black and bitter. 



14 Q. Leana N. Lea's 0. Leaves oblong, blunt at base, margin with a few angular, 

 very irregular lobes : acorn roundish, in a hemispherical cup. Hare. Ohio (Clark), 

 111. (Wolf). A hybrid ? but very constant. 



1 5 Q. alba L. White 0. (Fig. 339.) Lvs. short-petioled, acute at base, oblong, sinu- 

 ate-pinnatifld, lobes subequal, obtuse ; acorn sessile ; nut oblong-ovoid, \ immersed 

 in the tubercled cup. Timber very useful. 



16 Q. obtusiloba MX. Iron 0. Post 0. Tree middle size, wide-spreading ; leaves 

 cuneiform at base, downy beneath, deeply sinuate, the 3 upper lobes dilated, each 2- 

 lobed ; nut oval, half immersed, sweet. Timber good. 



1 7 Q,. macrocarpa MX. Moss-cup 0. (Figs. 340, 435.) Leaves deeply and lyrately 

 sinuate-lobed (most deeply in the middle) ; cup very deep, fringed with the pointed 

 scales, nut f or more immersed, V. Common. W. and S. 



1 8 Q. lyrata W T alt. Over-cup 0. Tree large ; leaves acute at base, whitish beneath, 

 with 79 triangular acute lobes ; cup rugged with the scales, nearly or quite inclu- 

 ding the round nut. Swamps, S. 



19 Q. bicolor W'illd. Swamp White 0. Tree handsome, 70f; leaves obovate, acute 

 and entire at base, white-downy beneath, with 9 or more obtuse teeth or lobes ; 

 acorns in pairs on long (1 2') peduncles. Low woods. 



20 Q. Prlnus L. Swamp Chestnut 0. Tree 50 70f, with large (!') sweet acorns; 

 leaves 47', obovate, crenate-undulate, downy beneath, with straight, strong veins ; 

 fruit ped. shorter than the petioles ; nut I immersed. (Q. monticola.) 



ft. actitntnata. Leaves oblanceolate, pointed, teeth sharp ; fruit subeeeeile. 

 y. prhioides. Shrub 3 4f ; fruit crowded, sessile ; leaves small. 



2. CASTANEA, Tourn. CHESTNUT. Sterile flowers in long, slender 

 nmcnts, fertile fls. few, 3 together, in an involucre. Cal. 6-lobed or parted. 

 Bta. 8 20. ? Ovary 3-6-celled, with as many stigmas. Fr. a prickly in- 

 volucre (burr), 4-valved, enclosing 1 3 coriaceous 1-seeded nuts. 5$ 

 Leaves acuminate, expanding before the flowers. Fig. 381. 

 1 C. vesca L. Tree 50 80f, with a large straight trunk. Lvg. 6 9 / long, lance-obitng, 



