28 
MISSOURI BOTANICAL GARDEN. 
The principal literature of the wood, twig and bud differ- 
ences of the genera Hicoria and Juglam is indicated in 
the following list. A generic key, based on wood structure, 
is given by Solereder, Holzstructur, 246, and one based on 
bark characters is given by Moeller, Anat. Baumrinden, 
308, while a bud synopsis is given by De Candolle, in the 
memoir cited, p. 8. 
Winter Characters. 
Brendel, Tree in Winter (Bull. 111. Lab. Nat. Hist, i.), 
28, 30, pi. 4, f. 18. — Damaskinos and Bourgeois, Bull. 
See. Bot. de France, v. 610. — Diez, Flora, 1887, 
550. — Feist, Schutzeinrichtungen der Laubknospen, 
327-8. — Foerste, Bot. Gaz. 1892, 182-3. 
Histological Characters. 
Hartig, Anat. Unterscheidungsmerkmale Holzer, 9; 3d 
ed. 18 ; Engl, transl. by Somerville, 33 ; Bot. Zeitung, 1859, 
106.— Houlbert, Ann. Sci. Nat., Bot. 7 ser. xvii. 161. — 
Mayr, Waldungen N. Amer. 153. — Solereder, Holzstruc- 
tur, 244. 
H. alba. 
Winter Characters. 
Brendel, /. c. pi. 2, f. 20. — De Candolle, Memoire Ju- 
glandees, 7-8.— Foerste, Bull. Dennison Uiiivy, i. 30.— 
Hitchcock, Key to Kas. Trees, 6. 
Histological Characters. 
Houlbert, I. c. 162.— Hough, Amer. Woods, iv. 90 (3 
sects, wood).— Moeller, Beitr. z.Vergl. Anat. desHolzes, 95. 
H. aquatica. 
Winter Characters. 
De Candolle, I. c. 7-8, f. 4. 
Histological Characters. 
Houlbert, L c. 161. — Hough, Amer. Woods, v. 115 (3 
sects, wood). 
