GERMINATION OF TREES AND SHRUBS 



325 



back. Leaflets short stalked, the petioliiles almost smooth, mar- 

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

 pointed bud. Trichomes simple, curved, generally rather broad, 

 walls thin, irregiilarly roughened. Seedlings of Gleditsia tria- 

 canthos collected fall of 1917. Stratified out of doors, placed in 

 greenhouse March 10, germinated May 12. Seeds germinating 

 in outdoor seed bed May 18, about 3 per cent. 



Fig. 96. — Kentucky coffee hesin (Gymnocladus clioica), seed, caulicle, rad- 

 icle and pinnately compound leaVes. Photographed by Photo. Section, P. E. 

 Colburn. 



Gymnocladus dioica (L) Koch. Seeds collected fall of 1911. 

 Buried three feet below the surface for six and one-half years. 

 Removed to greenhouse April 1, 1918, germinated 80 per cent. 

 Seeds .collected fall of 1917 and placed in greenhouse in the 

 spring germinated about the same. Germination hypagaeous; 

 hypocotyl thick, fleshy; radicle straight; root straight, with 



