GERMINATION OF TREES AND SHRUBS 



313 



Quercus falcata (Michx.). Spanish Oak. The acorns were 

 gathered at Clemson College, South Carolina, about December 

 1, 1917, and planted in humus in greenhouse December 7, 1917. 

 The first seed germinated on March 10, two about ^larch 20 and 

 one on March 22, 1918. Germination hypoga?ous, young bud 

 somewhat rusty, pubescent, curved as it pushes through the 

 ground. Hypocotyl with small scales, stipules small, pubescent, 



Fig. 74. — Trichomes of Quercus falcata. 1, from under side of leaf: 

 from stem ; 3, from upper side of leaf. Drawn by C. M. King. 



soon falling. First leaves small, alternate, entire ; upper surface 

 rusty, pubescent, lower surface densely pubescent, young stem 

 pubescent. Stem of older plants less pubescent, leaves becoming 

 somewhat rugose, penninerved, later the upper surface of 

 leaf with scattered groups of trichomes. Lower surface with 

 scattered groups. Midrib above and below more putiescent. 

 Trichomes of stem and leaves similar, slender, acuminate, in 

 groups of four to six. 



Quercus nigra L. Water Oai\. From Clemson College, South 

 Carolina, December 7, 1917. Wintered in greenhouse, germina- 

 tion hypogfeous. Stem slightly pubescent. Young leaves with 

 scattered pubescence on upper side, also hairs on branches. Lower 

 surface somewhat less pubescent, margin entire. 



Quercus imhricarm (Miclix.). Laurel or Shingle Oak. Col- 

 lected at Keosauqua, Iowa, September 29, 1918. Placed outside 



