58 



There ai'e now recognized' fifteen species and several varieties of 

 hickory, all of which grow in the United States east of the Rocky 

 ^lountains. Hickory grows in no other place in the world, except one 

 species in northern Mexico. The wood of the diffei-ent species of hickory 

 is not of e(iual commei'cial value, but the wood of the commercial 

 sjiecies heads the list of Indiana woods, for strength, toughness and 

 resiliency. 



The individuals of the several species vary much in resjject to their 

 t)ark, size and pubescence of the twigs, number and size of the leaflets, 

 size and slia|)e of the nuts. Xo attempt will l)e made to deal with all 

 of the extreme foi'ms, and only those rejiorted by Heimlich- and Sar- 

 gent^ will !)(' rliscussed. 



Bud scalis -t-(i, \-al\'afi! (in i)airs), leaflets gcnoralh' oin'V(!d 

 liai'kwai'd. 

 Leaflets 9-17, generally aliout 13; nut elongated, eireular in 



eross-seetion; kernel sweet 1 C illinoensis. 



Leaflets "i-O, generally .5-7; nut about as broad as long. 



coni])ressed in eross-seetion; kernel bitter 2 C. eordiformis. 



Bud scales more than (i, imbricated (not in jiairs); leaflets not 

 eur"\'ed backward. 

 Branehlets usually stout; termin.il buds large, 7-25 mm. 

 long; the year's growth usually more or less hairy; dry 

 husks 4-10 mm. thick. 



Prevailing number of leaflets .5 .3 C. ovata. 



Prevailing numljer of leaflets more than 5. 



Trees of low groimd; l>ark of young trees tight and 

 light, of older trees scaly, s(!parating into long thin 

 ])lates; branehlets usually light orange color; 

 imts usually largo, compressed, 3-6 cm. long, 



pointi^d at base 4 C. laciniosa. 



Trees of high ground; })ark of young trees tight and 

 dark, of older trees tight and deeply furrowed, the 

 thick ridges broken into short lengths which on 

 very old trees loosen at the base; branehlets red- 

 dish-lirowir; nuts usuall\- about half as large as 

 the preceding and usually with a rounded base. . . o C. alba. 

 Branehlets usually .slender; terminal buds small, 5-12 mm. 

 long; the j'ear's growth usually glabrous, rarely hairy; 

 dried husk 1-2.5 mm. thick. 

 Branehlets and leaves not eo\ ered when they first appear 

 with rusty-brown pubescence. 



iSargent in Bot. Gaz. Vol. 04: ,-,S:191,S. 



. ^, 2ll';;"V/'''i '/} C"'™; 'n'' ■^'-^"^- ^f'- nn7:4:i7:4.39:I918 credits most of mv records 

 jointly witli Prof. (.. i\ . Holfer. This is an error. On my mvitation Prof. Hoffer accompanied 

 rnc nine day.s in the field doms mycological work. While he gave me valuable assistance in 

 collecting during these days, his assistance and responsibility stopped there and he never 

 asked or expected to be considered joint author. Again on our trip we collected only in 

 Uaviess. Cjibson. Fountain, Knox, Lawrence, Martin, Pike and Sullivan Counties 

 aSargent I.e. 



