No. 14.] FLOWERING PLANTS AND FERNS. I45 



Shag-bark or Shell-bark Hickory. Walnut. 



Frequent or common. Woods and fields, in either moist 

 or dry ground. Late May — early June ; fruit Oct. 



The most valuable of our native nut trees both for its 

 timber and its fruit. The nut is the common Hickory Nut of 

 the markets. 



Carya alba (L.) K. Koch (white). 

 Carya tomentosa Nutt. 

 Hicoria alba Britton. 

 Mocker Nut. White-heart Hickory, 



Occasional or frequent. Rocky woods and pastures, mostly 

 in dry ground. Early June ; fruit Oct. 



The timber is nearly equal to that of the Shag-bark Hick- 

 ory, the nuts not as good. 



Carya microcarpa Nutt. (small-fruited). 

 Hicoria microcarpa Britton. 

 Small-fruited Hickory. Little Pignut Hickory. 



Rocky woods and hillsides in either dry or moist ground. 

 Occasional or frequent along or near the coast, apparently not 

 extending far inland. Late May — early June ; fruit Oct. 



The nuts are usually bitter. The open or half-open husks 

 often hang on the tree through the following summer. 



Carya glabra (Mill.) Spach (smooth). 

 Carya porcina Nutt. 

 Hicoria glabra Britton. 

 Pignut or Broom Hickory. Pignut. 



Occasional or frequent. Rocky woods and hillside pas- 

 tures. Late May — early June ; fruit Oct. 



The nuts, usually bitter though sometimes sweet, are of 

 little value. The timber is equal in value to that of the Shag- 

 bark Hickory. 



Carya cordiformis (Wang.) K. Koch (heart-shaped). 

 Carya amara Nutt. 

 Hicoria minima Britton. 

 Bitter Nut or Swamp Hickory. 



Occasional. Wet woods and banks of streams. Late May 

 — June ; fruit Oct. 



Nuts very bitter, inedible. 



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