332 



IOWA ACADEMY OF SCIENCE Vol. XXV, 1918 



tate. Tlie next leaves opposite when unfolding, pubescent, upper 

 and lower surface of leaf pubescent. Two leaflets, the smaller 

 leaf merely deeply lobed, the other leaf two-parted: leaves or 

 leaflets penninerved; stipules wanting. The petioles and leaves 

 are at first abundantly clothed with a soft pubescence of color- 

 less hairs. These hairs have two to six cells, apical cell usually 

 exceeding the remainder in width. Cell-wall thin, bearing deli- 



Fig. 107 



Fig. lOS 



Fig. 107. — Several-celled trichomes, from leaves of Aesculus glabra var. 

 arguta. Drawn by C. M. King. 



Fig. 108. — 1. Aesculus glabra. 2. Aesculus glabra var. arguta. Both 

 from Chariton river bottoms, Centerville, Iowa. Drawn by C. M. King. 



cate roughenings, which give a striate a]')pearance ; apex 

 rounded ; hairS: curv^ed, often twisted. Older cells becoming 

 yellowish; on the older seedling the hairs of stem and leaf be- 

 come scattered. Germinated in out door seed bed, about May 

 30, 10 per cent. 



