262 
IOWA ACADEMY OF SCIENCE Vox,. XXIX, 1922 
Fig. 7. Seedling of Rhus Toxicodendron. 
Trichomes, edge of leaf (a) ; stem (b) 
Drawn by C. M. King 
Fig. 8. Seedling of 
Rhus canadensis 
Drawn by C. M. King 
Piammel. Planted in greenhouse October 1. Showed germina- 
tion the middle of' December. 
Germination epigaeous. Hypocotyl reddish, surface granular. 
Cotyledons somewhat fleshy, long stalked, petiole grooved, red- 
dish. Cotyledons green upon both surfaces. Stem above the 
cotyledons, granular or scurfy, whitish. First leaf 3-parted, long 
petioled; the leaflets prominently veined, smooth upon both sur- 
faces; first pair of leaflets entire, terminal leaflet serrate. Second 
leaf like the first, except that each leaflet is coarsely 3-lobed ; leaf- 
lets smooth. 
Gleditsia aquatica. Marsh. Water Locust. 
This seed was supplied by Dr. Morton of Greenville, South 
Carolina. The seeds were placed out of doors in garden soil 
during the months of January and February, 1922; the winter 
was mild. 
The last of February they were planted in pots in the green- 
