GERMINATION OF TREES AND SHRUBS 



301 



10, 1917. Removed to greenhouse March 29, 1918. Gerininated 

 May 9, 1918, 75 per cent, germination hypogaeous. Stem reddish, 

 first leaves scalelike, glandular-pubescent above and below; 

 small bud in axil of the scale. Fifth leaf of two, three or four 

 leaflets, bud in axil of the leaf. Petiole glandular-pubescent. 

 Upper surface of the leaves slightly glandular-pubescent ; prom- 

 inently reticulately veined, dentate, teeth glandular, petioles 

 glandular-pubescent. Hairs upon the leaf, simple, slender, 

 curved, sharp pointed. Colorless glandular hairs abundant, 

 short stalked. Seeds planted in the fall of 1917 germinated out 

 of doors, about 10 per cent by June 1. 



Juglans nigra L. Black Walnut. Seedling examined from La 



Fig-. 4S. — Trichome of Juglans nigra , and 

 Drawn by C. M. King. 



flandular liairs, from leaf. 



Crosse, Wisconsin, June 3, 1918. Germination hypoga*ous. Lub- 

 bock^^ states as follows: "Cotyledons bilobed and the lobes again 

 bifid with the secondary segments entire or emarginate (in the 

 immature state) slightly auricled at the 'base ; radicle short, 

 stout, triangular pointed." Root long, tapering, numerous root- 

 lets, lower portion of stem smooth, bearing occasional alternate 

 scales, upper part of stem purple, early leaves alternate, petio- 

 late, small, simple, dentate, serrate, leaf, stem and petioles gland- 

 ular, hairy, no stipules, buds in axils of leaf ; three simple leaves 

 occur on the stem alternate in arrangement, followed by the first 

 compound leaf, which is 3-parted, having two lateral leaflets and 



"A contribution to our Ivnowledge of seedlings, 2, pp. 51 7-51 S. 



