March, 1905.] 
Key to Ohio Walnuts. 
307 
25. Vitis labrusca L. 
26. “ a-stivalis Michx. 
27. “ bicolor Le Conte. 
28. “ vulpina L. 
29. Vitis cordifolia ^lichx. 
.30. Ampelopsis cordata Michx. 
. 31 . Parthenocissus quinquefolia 
(L.) Planch. 
In our species belonging to the Passiflorace.^; there is a 
single unbranched tendril coming from the axil of the leaf. It 
coils in the usual manner. 
32. Passiflora lutea L. 
The tendrils in the Cucurbitace^ represent modified shoots; 
part of the tendril being stem and part leaf. They are from two 
to five branched, all the branches coming from the same point. 
Thev usually appear beside the leaf. The Ohio species are: 
33. Micranipelis lobata (i\Iichx) 
Greene. 
34. Sicyos angulatus L. 
35. Cucurbita pepo L. 
36. " pepo ovifera L. 
37. Cucurbita maxima L. 
38. Citrullus citrullus (L.) Karst. 
39. Cucumis melo L. 
40. “ sativus L. 
KEY TO OHIO WALNUTS BASED ON TWIG CHARACTERS. 
JOHX H. SCHAFFXER. 
jiiglans L. Trees with valuable often very dark-colored 
wood, spreading branches, and fragrant bark; twigs with terminal 
buds and superposed axillary buds and with dark brown bark; 
leaf scars alternate, large, heart-shaped, not 2-ranked; bundle 
scars 3 or in 3 areas ; stipular scars none ; end of twig often show- 
ing a self-pruning scar caused by the falling away of the car- 
pellate peduncle; pith diaphragmed, with cavities. 
1. Bark of twigs very pubescent. 2. 
1. Bark of twigs glabrous; terminal bud and most of the lateral buds 
hemispheric or very short -pointed, but some maj^ be cone-shaped; 
cultivated. J. regia L. English Walnut 
2. Axil of leaf scar with a hairy cushion below the buds; terminal bud 
light-colored, usually truncate, with long scales; lateral buds 
usually spher'cal. j. cincrea L. Butternut 
2. Axil of leaf scar without a hairy cushion ; terminal bud dark-colcred, 
usually pointed, with short scales; lateral buds ovoid-conic. 
J . nigra L. Black Walnut 
The Xature Study Review, published in New York under the 
editorship of Prof. M. E. Bigelow of Columbia and with a verv 
distinguished list of associates is undertaking to develop the nature 
study movement along lines which will doubtless command 
the support of the better class of naturalists. 
There has been of late years so much of a tendencv to run the 
nature study idea into such extremely popular and superficial 
lines that the real purpose and intent of the originators has been 
endangered. That there is abundant place for everv agencv 
that will tend to extend the knowledge of nature while at the 
