28 MISSOURI BOTANICAL GARDEN. 
The principal literature of the wood, twig and bud differ- 
ences of the genera Hicoria and Juglans 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. 
HICORIA. 
General. 
Winter Characters. 
Brendel, Tree in Winter (Bull. Ill. Lab. Nat. Hist. i.), 
28, 30, pl. 4, f. 18.— Damaskinos and Bourgeois, Bull. 
Soc. 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 Hdélzer, 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, 7. c. pl. 2, f. 20. — De Candolle, Mémoire Ju- 
glandées, 7-8.— Foerste, Bull. Dennison Univy. i. 30.— 
Hitchcock, Key to Kas. Trees, 6. 
Histological Characters. 
Houlbert, 7. c. 162.— Hough, Amer. Woods, iv. 90 (3 
sects. wood ).—Moeller, Beitr. z. Vergl. Anat. des Holzes, 95. 
H, aquatica. 
Winter Characters. 
De Candolle, 7. c. 7-8, f. 4. 
Histological Characters. 
Houlbert, 7. c. 161. — Hough, Amer. Woods, v. 115 (3 
sects. wood). 
