JVGLANDACEAE. 119 



1. Juglans nigra L. Black Walnut. M. p. 323. Rich woods. Spring. 



2. Juglans cinerea L. Butternut, White Walnut. M. p. 323. Rich or 



rocky woods. Spring. 



2. HIOORIA Raf. 



Bud-scales valvate; lateral leaflets lanceolate or oblong-lanceolate, falcate. 



1. H. minima. 

 Bud-scales imbricate; lateral leaflets not falcate. 



Husk Of the fruit freely splitting to the base ; middle lobe of stamiiiate 

 calyx narrow, often at least twice as long as the lateral ones. 

 Bark shaggy, separating in long plates. 



Leaflets 3-5 (rarely 7) ; nut rounded at the base, 1-2 cm. long. 



2. It. ovnta. 

 Leaflets 7-9; nut usually pointed at both ends, 2.5-3 cm. long, 



3. H. laciniosa. 

 Bark close, rough; leaflets 7-9. 4. H. alba. 



Husk of fruit thin, not freely splitting to the base; lobes of the stam- 



inate calyx mostly nearly equal. 

 Fruit nearly globular; nut thin-shelled; bark, at least that of old 



trees, separating in strips. 5. H. microcarpa. 



Fruit obovoid; nut thick-shelled; bark close. 6. H. glabra. 



1. Hicokia minima (Marsh) Britton. Bitter-nut, Swamp Hickory. M. p. 



324. Moist soil. Spring. 



2. Hicokia ovata (Mill.) Britton. Shell-bark, Shag-bark. M. p. 324. 



Rich soil. Spring. 



3. Hicokia laciniosa (Michx.) Sarg. Big Shell-bark, King-nut. M. p. 324. 



Rich soil. Spring. 

 Philadelphia— (P.). Bucks— Rock Hill, Bedminster (Fr.), Sellersville 

 (Mac). Montgomery— Shannonville (Cr.). Delaware— Swarthmore^ one 

 tree (Pr.), Radnor, J. Evans (B. Sm.). Lancaster— (P.). Berks— (P.). 

 Mercer — According to Mr. Chas. E. Smith a large tree at Borie station 

 on P. R. R., 15 miles from Trenton (Ke.). 



4. HlCCRIA alba (L.) Britton. Mocker-nut, White-heart Hickory. M. p. 



325. Rich soil. Early summer. 



5. Hicokia microcarpa (Nutt.) Britton. Hickory. M. p. 325. Rich woods. 



Spring. 



6. HlOORlA glabra (Mill.) Britton. Pig-nut Hickory. M. p. 325. Dry hills 



and uplands. Early summer. 

 Hicoria Pecan (Marsh.) Britton. Pecan. M. p. 324. In cul- 

 tivation. Spring. 

 Philadelphia— Ba.ttTBiTn'8 Garden (Je.). Delaware— Concord 

 (W. Tr.). 



Order 5. FAGALES. 



Both staminate and pistillate flowers in aments. Fam. 1. Betulaceae. 



Pistillate flowers subtended by an involucre, which becomes a bur or a 



cup in fruit., Fam. 2. Fagaceae. 



