524 



IOWA ACADEMY OF SCIENCE Vol. XXV, 1918 



Sarotliamnus and Ilex Europaeus. The germination is also de- 

 scribed in Sargent's Silva.-^ 



Gleditsia trio/canthos L. Seeds collected fall of 1911, 'buried 

 three feet below surface, for six and one-half years. Germina- 

 tion 80 per cent, planted in greenhouse April 1; germinated 

 April 8. Seeds gathered fall of 1917, and placed in greenhouse 

 in the spring. Germination epiggeous. Germinated 80 per cent. 

 Hypocotyl very long, green, smooth; straight tap roots with nu- 



Fig. 95 — Honey Locust (Gleditsia triucanthos). The stout radicle, caul- 

 icle, fleshy sessile cotyledons and alternately pinnately compound leaves. 

 Photographed by Photo. Section, P. E. Colbum. 



merous lateral roots. Cotyledons smooth, fleshy, elliptical, auri- 

 cled at the base, sessile, 7 mm. to 8 mm. by 17 mm. to 20 mm. 

 First internode slightly pubescent. Leaves alternate. First leaf 

 pinnately compound with seven pairs of leaflets. Petioles 

 slightly swollen at base, pubescent along the upper surface. ^lar- 

 gins of leaflets somewhat serrate ; at base of petiole is the conical 



"Silva of North America 3: 67-71. 73-77. 



