JUGLANDACEAE. 119 



1. JuGLANS NIGRA L. Black Wahiut. M. p. 323. Rich woods. Spring. 



2. JuGLANS CINEREA L. Butternut, White Walnut. M. p. 323. Rich ot 



rocky woods. Spring. 



2. HICORIA Raf. 



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



1. U. minima. 

 Bud-scales imbricate ; lateral leaflets not falcate. 



Husk of the fruit freely splitting to the base; middle lobe of staminate 

 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. //. ovnta. 

 Leaflets 7-9; nut usually pointed at both ends, 2. .1-3 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. HicORiA MINIMA (Marsh) Britton. Bitter-imt, Swamp Hickory. M. p. 



324. Moist soil. Spring. 



2. HiCORiA OVATA (Mill.) Britton. Shell-hark, Shag-bark. M. p. 324. 



Rich soil. Spring. 



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



Rich soil. Spring. 

 Philadelphia— (F.). Bucks— Bock Hill, Bedminster (Fr,), Sellersville 

 (Mac). xl/o/(*f7ome/-2/— Shannonville (Cr.). Z^eZaware— Swarthmore, one 

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

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

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



4. HicORiA ALBA (L.) Britton. Mocker-nut, Whiic-heari Hickory. M. p. 



325. Rich soil. Early summer. 



5. HlcORiA MICROCARPA (Nutt.) Britton. Hickory. M. p. 325. Rich woods. 



Spring. 



6. HiCORiA 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— Bnrtr am 's Garden (Je.). Delaware —Goimord 

 (W. Tr.). 



Orders. PAGALES. 



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. 



