ORDER CXV. — AMENTACKJt 511 



Yak. (a) Q. trilo'ba, (L.) Leaves cuneate, nearly equally 3-lobed at 

 the summit, mucronate. 



Yar. (b) Q. pagod.efo'lia, (Ell.) Leaves oblong, many-lobed, on 

 rather long petioles ; lobes simple, mucronate. 



13. Q. ilicifo lia, (Van.) A small shrub. Leaves cuneate, on long 

 petioles, obovate, 3 — 5-lobed, tomentose beneath. Fruit abundant. 

 Acorn ovate, in a shallow cup. — ^ . April — May. Poor soils. 3 — 8 fc. 



c. Fructification annual. Leaves unav.ned. 



11 Q. obtusilo'ba, (Mich.) A middle-sized tree, with irregular 

 branches. Leaves oblong, sinuate, on short petioles, generally 5-lobed, 

 the upper ones dilated, pubescent beneath. Acorn oblong, in a hemi- 

 epherical cup. — ^. April. In stonv, clay soils. 30 — 40 feet. 



Post Oak: 



15. Q. lyra'ta, (Walt.) A large tree. Leaves long, irregularly ly- 

 rate, the lobes oblong, nearly acute, the upper ones dilated, glabrous. 

 Acorn nearly globular, almost entirely inclosed in the cup. — ^ . April 

 In swamps. 60 — 70 feet. Over-cup Oak. 



10. Q. alba, (L.) A large tree. Leaves oblong, pinnatifid, sinuate, 

 pubescent beneath, on short petioles. Lobes oblong, obtuse. Fruit 

 large, usually in pairs. Acorn ovate, in a deep cup. — ^ . April. 

 Rich soils. 70—80 feet. White Oak. 



17. Q. pri'xus, (L.) A large tree, with a long trunk without branches. 

 Leaves large, obovate, or oblong lanceolate, obtusely toothed, slightly 

 pubescent beneath. Fruit abundant. Acorn large, in a hemispherical 

 cup. — J 2 . April. Common. 70 — SO feet. Swamp-chestnut Oak. 



18. Q. Michaix'ii, (Xutt.) A large tree. Leaves obovate, unequally 

 toothed, sinuate, obtuse at the base, tomentose beneath. Fruit usually 

 in pairs. Acorn large, ovate. — T <? . April. Rich soils. 60 — 80 feet. 



19. Q. monta'xa, (Willd.) A large tree. Leaves obovate, acute, to- 

 mentose beneath, coarsely toothed, teeth indurated at the point. Acorn 

 ovate, in a hemispherical cup. — ^. April. In rocky places near the 

 mountains. 30 — 50 feet. 



20. Q. Casta'xea, (Muhl.) A large tree. Leaves oblong-lanceolate, 

 on long petioles, tomentose beneath, acuminate, coarsely-toothed, teeth 

 with indurated points. Acorn ovate, in a hemispherical cup. — ^. 

 April — May. In rich, damp soils. 60 — 70 feet Chestnut Oak. 



21. Q. chix'quapix, (Mich.) A small shrub, with a smooth, slender 

 etenx Leaves oblong-lanceolate, on short petioles, coarsely toothed, 

 glabrous when mature. Acorn ovate, in a hemispherical cup. — ^. 

 April — May. Xear the mountains. 3—4 feet. 



Genus XII— CASTA'XEA 19—12. 

 (Castanea, a town In Thessaly.) 



M'-.noecious. Sterile florets ; ament naked, long, cylindrical ; 

 perianth 6-lobed. Stamejis 5 — 20. Fertile florets 3, within a 

 muricated involucre ; perianth 5 — 6-lobed. Styles 6. Seed 

 1 — 3, inclosed by the involucre. 



1. C. ves'ca, (L.) A large tree, generally with an erect trunk and 



