510 The Ohio Naturalist. [Vol. XII, No. 6, 



48. Fruit obliquely oblong or oval, compressed, gibbous, | in. 



long, reticulate-veined. Cotinus. 



49. Nut sharply 3-angled; usually 2 together in the 4-valved 



bur. Fagus. 



49. Nut not 3-angled. 50. 



50. Nut less than }4 in. long, somewhat compressed. 51. 



50. Nut large, more than 3^ in. long, or if not then circular in 



cross-section. 52. 



51. Nut with ridges; fruiting bract 3-cleft and incised. Carpinus. 



51. Ridges of the nutlet inconspicuous, fruiting bract bladder- 



like. Ostrya. 



52. Nut with 2 or 3 prominent ridges, sometimes with rough 



wrinkles. 53. 



52. Nut not with ridges. 54. 



53. Nut rugose or sculptured; husk indehiscent. Juglans. 



53. Nut smooth or angled, husk at length splitting into seg- 



ments. Hicoria. 



54. Nut ovoid-oblong or subglobose; cup with imbriacted, more 



or less united bracts. Quercus. 

 54. Nut plano-convex or rounded ; bur globose and very prickly. 



Castanea. 

 54. Seed, which may be mistaken for a nut, not showing a style, 

 large and shining; capsule splitting into 3 valves. 



Aesculus. 



-55- 



55. Fruit a pome, the carpels enclosed by an adnate, perigynous 



disk or hypanthium. 5(3. 

 oo. Fruit a berry, or berry-like, wifh several seeds. GO. 

 do. Fruit a drupe, or drupe-like, with a stone or pit and with 



1 or rarely 2 seeds. 66. 



56. Ripe carpels of the ]oomc papery or leathery. 57. 



56. Ripe carpels bony. Crataegus. 



57. Pome small and berry-like. 58. 



57. Pome large, fleshy like the apple. 59. 



58. Pome scarlet when ripe, cavities not more than 5. Sorbus. 



58. Pome purplish-red to purplish-blue when ripe, cavities 



usually 10. Amelanchier. 



59. Seeds not more than 3 in each cavity; pome tapering into the 



peduncle; flesh with grit-cells. Pyrus. 

 59. Seeds not more than 3 in each cavity; pome sunk in at both 



ends, its flesh without grit-cells. Mains. 

 59. Seeds many in each cavity, flesh of pome hard. Cydonia. 

 (JO. Berry large, very much elongated, green with }'ellow pulp 



and large brown seeds. Asimina. 

 iH). Berry ovoid or globose. 61. 



