28 Spring Flora of Ohio. 



F'riiit witli an iiidehisccnl pericarp; pith in plates .Ju,u:la>is. 1 



P'ruit with a l-w.Ived dry exocarp Hicoria. 2 



1. Genus JUG'-LANS. — Sterile flowers in lateral catkins from the 

 wood of the preceding year; stamens 12-40; fertile flowers solitary or 

 several at the end of the branches. 



Jug'-lans cin-e'-re-a L. Butternut; White Walnut.— Leaflets 5-8 pairs, 

 downy especially beneath ; petioles and branchlets down}' with clammy 

 hairs ; fruit oblontj. 



Jug'-lans ni'-gra L. Black Walnut.- Leaflets 7-1 1 pairs, the petioles 

 and underside of leaflets minutely downy; fruit spherical. 



2. Genus HIC-O'-RI-A. [Carya.) — Sterile flowers in slender lateral 

 clustered catkins, stamens ;l-10; fertile flowers 2— t in a cluster or short 

 spike at the end of the branch. 



A. Husk nf fruit thick and woody, splittiiitr promptly. 

 b. Bark .vZ/a.^rsf 1' or I'.v/'o/iirtii/ i;- in strips or fi/ates.'; 



Hic-o'-ria o-va'-ta (Mill.) Britt. {Ca/ya a/ba Xutt.) Shell-bark or 

 Shag-bark Hickory. — Leaflets 5-7, the lower pair much smaller; fruit 

 globular or depressed, nut white, flattish-globular, the shell thinnish. 



Hic-o'-ria la-cin-i-o'-sa (Mx. f) Sarg. [Carya sulcata Nutt.) Big 

 Shell-bark: Kingnut. - r^eaflets 7-1'; fruit oval or ovate, the husks very 

 thick; nut large, 1 '4-2 in. long, tisually angular, dull-white or yel- 

 lowish, thick-walled. 



1). Bark close, not exfoliating ^, 



Hic-o'-ria alba (L.) Rritt. (Carya touioito.m Nutt.) Mocker-nut; 

 White-heart Hickory; Black Hickory. — Catkins, shoots and lower surface 

 of leaves foiitotfose when young, resinous scented ; leaflets 7-!) ; fruit 

 globular or avoid, with very thick and hard husk ; nut globular, not 

 compressed, 4-ridged toward summit. 



Hic-o'-ri-a mi-cro-car'-pa (Xutt.) Britt. [Ca/ya microcarpa Nutt.) 

 White Hickory. - Bark, buds and foliage like the next, fruit small, 

 subglobose with rather thin husk, nut thin-shelled, not angled. 



A. f/iisk //nil, \-7'a/re(/ /o uiiddle or /ardily /o near base : hark no/ ex/otia/ing. 



Hic-o'-ria glab'-ra (Mill.) Britt. (Carya porcina Nutt.) Pig-nut: 

 Brown Hickory. — Shoots, catkins and leaves glabrous or nearly so, 

 leaflets 5-7, fruit pear-bhaped, oblong or oval ; nut oblong or oval, 

 l}4-~ in. long, with a thick, bony shell. 



