April, 1912.] Key to the Fruits of the Genera of Trees. S^^ 



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 ] 2 in. in diameter. 02. 



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. Cw. 



65. Berry-like drupe usually red or \-ellowish, with 4-S bony or 



crustaceous nutlets. Ilex. 



65. Berry-like drupe black, with 2-4 seed-like nutlets. 



Rhamnus. 

 Gb. Berry very saponaceous, dark; seeds 1-3, crustaceous, 



globose. Sapindus. 

 (So. Berry black, with 1 erect, shining seed. Bumelia. 



66. Fruit large, usually 2 in. or more in diameter; stone or nut 



deeply j^itted, corrugated, or sculptured, usually 1)^ in, or 

 more long. ()7. 



66. Stone not deeply pitted, corrugated, or sculptured, not more 



than ^i in. long; if reticulated, then less than Yl ii^- 

 long. 6S. 



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 I4 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. 71. 



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. 



