April, 1912.] Key to the Fruits of the Genera of Trees. 
5 1 1 
61. Berry about 1 in. in diameter, reddish-yellow, with 4-12 
large, flat, hard seeds and with the enlarged calyx at the 
base. Diospyros. 
61. Berry not over in. in diameter. 62. 
62. Fruit inferior, showing scars or parts of the perianth and 
stamens at the tip. 63. 
62. Fruit superior, showing only the style at the tip, with scars 
or perianth parts if present at the base. 64. 
63. Fruit scarlet, cavities 5. Sorbus. 
63. Fruit purplish-red to purplish-blue, cavities usually 10. 
Amelanchier. 
63. Fruit black, small, cavities 5. Aralia. 
64. Fruit really a berry-like blue cone, showing the carpel tips 
on the sides, on close inspection. Juniperus. 
64. Fruit not a modified cone, but a true berry. 65. 
65. Berry-like drupe usually red or yellowish, with 4-8 bony or 
crustaceous nutlets. Ilex. 
65. Berry-like drupe black, with 2-4 seed-like nutlets. 
Rhamnus. 
65. Berry very saponaceous, dark; seeds 1-3, crustaceous, 
globose. Sapindus. 
65. Berry black, with 1 erect, shining seed. Bumelia. 
06. Fruit large, usually 2 in. or more in diameter; stone or nut 
deeply pitted, corrugated, or sculptured, usually V/l in. or 
more long. 67. 
66. Stone not deeply pitted, corrugated, or sculptured, not more 
than % in. long; if reticulated, then less than X A, in- 
long. 68. 
67. Flesh of fruit black or greenish, hard, with strong odor; seed 
in the nut much wrinkled. Juglans. 
67. Drupe pubescent, its flesh sweet; seed in the stone smooth. 
Amygdalus. 
68. Drupe white-waxy, less than in. in diameter, globose, 
tuberculate. Myrica. 
68. Drupe not white-waxy, if somewhat resinous then much 
larger. 69. 
69. Fruit superior, showing only a style or its scar at the tip but 
usually the remains of a calyx below. 70. 
69. Fruit inferior, showing sepals, petals, and stamens or their 
remains or scars at the tip. 75. 
70. Drupe small, with red acid hairs, or if gray then the stone 
striated. Rhus. 
70. Drupe not with red acid hairs nor gray with striated stone. 7 1 . 
71. Drupe narrowly oblong, about 1 in. long. Adelia. 
71. Drupe globose, oval, or globose-oblong. 72. 
72. Stone ridged and reticulated, showing prominent teeth in 
cross-section. Celtis. 
