Feb., 1905.] Key — Ohio Sumacs in Winter Condition. 
293 
The following named plants, found in Ohio, produce hiber- 
nacula ; 
Lemna cyclostasa (Ell.) Chev. 
Lemna minor L. 
Lemna triuslca L. 
Spiroclela polvrhiza(L.) Schleid. 
Wolffia Columbiana Karst. 
Wolffia punctata Gris. 
Philotria canadensis (Mx.) Britt. 
Zannichellia palustris L. 
Potomageton pusillus L. 
Potomageton lonchitis Tuckerm. 
Potomageton pusillus polyphyllus 
Morong. 
Potomageton zosterrefolius Schum. 
Potomageton friesii Ruprecht. 
Potomageton vaseyi Robbins. 
L^tricularia cornuta Mx. 
Utricularia gibba L. 
L^tricularia intermedia Hayne. 
G^tricularia vulgaris L. 
Myriophyllum heterophyllus Mx. 
Myriophyllum spicatum L. 
Myriophyllum tenellum Bigel. 
Myriophyllum verticillatum L. 
KEY TO THE OHIO SUMACS IN THE WINTER CONDITION. 
M.abel Schaffxer. 
Rhus L. Small trees, shrubs, or woody vines climbing by 
rootlets, with a milky or acrid resinous sap; pith more or less 
cylindrical, often large, white, brown, or yellowish; leaf scars 
alternate, not two-ranked; bundle scars several; stipular scars 
none; terminal bud present or absent; axillary buds single, not 
clustered at the tip of the twig, sometimes surrounded by or hid- 
den under the leaf scar ; bud scales several ; sap of some species 
poisonous to most people when touched. 
1. Leaf scar surrounding the axillary bud; pith very large, brown; 
erect shrubs or small trees. 2. 
1. Leaf scar not completely surrounding the axillary bud; pith medium; 
erect shrubs, small trees, or woody vines climbing by rootlets. 3. 
1. Leaf scar on the short petiole base which covers the axillary bud; pith 
small; bark glabrous, aromatic; low, ascending or diffuse shrub. 
R. aroinatica Ait. Fragrant Sumac. 
2. Twigs glabrous, somewhat glaucous. R. glabra L. Smooth Sumac. 
2. Twigs velvety-hairy. R. hirta (L.) Sudw. Staghorn Sumac. 
3. Bark velvety pubescent, brown; buds short, rounded; erect shrub or 
small tree. R. copallina L. Dwarf Sumac. 
3. Bark glabrous or nearly so, or if pubescent then with aerial rootlets, 
gray or brownish-gray; buds projecting; bark and wood poisonous 
to most people when touched. 4. 
4. Leaf scars heart-shaped; bundle scars numerous, scattered; erect 
shrub or small tree in swamps. R. vernix L. Poison Sumac. 
4. Leaf scars U-shaped ; bundle scars numerous, scattered or arranged 
in a curve; woody vine climbing by aerial rootlets, sometimes 
shrubby or tree-like. R. radicans L. ' Poison Ivv. 
