KEY, BASED UPON FRUIT. 17 



e. Sunken at insertion of pedicel, 

 /. Globular 



Large, 1 in. or more, distinctly 5-celled . .30. PYRUS MALUS. 



Small, more or less 10-celled 59. AMELANCHIER CANADENSIS. 



/ 2 . Fattened-globose, waxy, fragrant and very tart. 



88. PYRUS CORONARIA. 



e 2 . Not sunken at insertion of pedicel, pyriform . . .57. PYRUS COMMUNIS. 

 d*. Not cartilaginous, 1-5 bony seeds. 



f in. in diameter, red or yellow, with white spots. 



58. CRATAEGUS PUNCTATA. 



- in. in diameter, leaves wedge-obovate . .85. CRATAEGUS CRUS-QALLI. 

 c 8 . Berry. 



d. With persistent thickish calyx-lobes, large (about 1 in. or more), 



61. DlOSPYROS VlRGINIANA. 



d 2 . Without persistent calyx-lobes and smaller 



e. In thyrses 78. VITIS ^ESTIVALIS. 



e 2 . In compact-racemes and 



Hoary -tomentose 131. GARRYA ELLIPTICA. 



Smooth and flattened- globose 133. ARCTOSTAPHYLOS PUNGENS. 



e 3 . In open panicles 132. ARBUTUS MENZIESII. 



c 9 . Fleshy with custard- like edible pulp 76. ASIMINA TRILOBA. 



c 10 . Berry-like pome, $ in. in diameter and borne in dense clusters. 



84. PYRUS SAMBUCIFOLIA. 

 c 11 . Hesperidum seeds in juicy pulp and rind leathery. 



Subglobose. flattened at the ends. 103. CITRUS AURANTIUM. 



Globose-oblong, mammillate at the extremity. . .104. CITRUS LIMONUM. 

 c 12 . Achenium. 



3-4 angled and with membranous wing-like margins. 



108. CLIFTONIA LIGUSTRINA. 

 Linear-oblong, tipped with the prolonged tail-like style. 



130. CERCOCARPUS PARVIFOLIUS. 



c l \ Baccate but with dry spongy pericarp 175. YUCCA ARBORESCENS. 



2 . Dehiscent pericarp. 

 c. Subglobose, and 



dm Coriaceous or woody, dehiscent by 



e. 2-3 valves and containing one or very few large seeds with smooth shin- 

 ing coat and a large scar (AZsculus), fruit 



Prickly and leaflets 7 6 ^ESCULUS HIPPOCASTANUM. 



Smooth and leaflets 5 127. ^ESCULUS CALIFORNICA. 



e 2 . 4 more or less distinct valves (Carya). 

 f. Epicarp thick and separating quite freely to the base ; nut ridged 



with thick shell, globular-ovoid and 

 g. Flattened. 



1 in. or less in length .36. CARYA ALBA. 



1^ in. or more in length 64. CARYA SULCATA. 



</ 2 . Not so much flattened, usually 4-angled. 



90. CARYA TOMENTOSA. 



/ 2 . Epicarp only moderately thick and nut of medium size, moderately 

 ridged and with shell of medium thickness. 



65. CARYA PORCINA. 

 / 3 . Epicarp thin, nuts small and thin-shelled ; kernel 



</. Astringent and bitter ; sutures of epicarp very prominent ; nut 

 Quite smooth, whitish and only slighly compressed. 



37. CARYA AMARA. 

 Rough, reddish, strongly compressed and angled. 



115. CARYA AQUATIC A. 



gr 5 . Slightly if at all bitter, nut whitish and sutures moderately promi- 

 nent 91. CARYA MICROCARPA. 



e*. 5-20 valves recurving from central axis and liberating numerous fine 



seeds 158. RHODODENDRON CALIFORNICUM. 



d*. Covered with spines ; dehiscent 

 e. By four valves ; nuts 



Sharply 3- angled, 2 together, involucre soft-prickly. 



16. FAGUS FERRUGINEA. 



