March, 1905.] Key, Ohio Maples in Winter Conelition. 
297 
4. Those found on rocks 
Polypodium vulgare. 
■' polypodioides. 
Pellffia atropurpurea. 
Asplenium pinnatifidum. 
ebenoides. 
" trichomanes. 
“ ruta-muraria. 
either limestone or sandstone are: 
Asplenmm montanum. 
“ parvulum. 
Camptosorus rhizophyllus. 
Filix bulbifera. 
tVoodsia ilvensis. 
Selaginella rupestris. 
5. A verv few may be found growing in sandy soil. Among 
these we find: 
Equisetum arvense. Equisetum sylvaticum. 
“ pratense. 
0. The following are found growing under varying conditions 
in manv localities: 
Botrychium obliquum. 
“ dissectum. 
■' lunaria. 
“ virginianum. 
Onoclea sensibilis. 
Matteucia struthiopteris. 
Dennstaedtia punctilobula. 
Dryopteris thelypteris. 
Polystichum acrostichoides. 
Asplenium angustifolium. 
Pteridium aquilinum. 
7. In addition to what has been mentioned above, Osmunda 
regalis is occasionally found in standing water, and Azolla 
caroliniana floating on still water. 
KEY TO THE OHIO MAPLES IN THE WINTER CONDITION. 
Ch.\rles H. Flory. 
Acer, L. Trees or shrubs with fibrous roots; twigs slender or 
sometimes robust, usually glabrous, green, gray, brown or red, with 
or without lenticular corky ridges ; lenticels sometimes prominent ; 
pith solid, rather small; leaf scars opposite, contiguous or con- 
nected by a ridge, sometimes meeting in a free point, either U or 
V shaped ; stipular scars none ; bundle scars 3-5 ; buds short- 
stalked or sessile ; terminal bud present ; lateral buds prominent, 
often three side by side; scales either dry or fleshy, glabrous or 
pubescent, brown, gray, green or red; bark close or exfoliating, 
gray, brown or black; wood light colored, usually hard, heavv, 
strong, stiff and tough, of fine texture or frequently wavy 
grained; fruit a 2-winged, 2- seeded samara. 
1. Twigs green or purplish green, glaucous; axillary buds originally cov- 
ered by the petioles; buds hairy, not stalked; leaf scars meeting in 
a free point. Acer negiindo L Boxelder. 
1. Twigs green, brownish, or reddish, with narrow, white, longitudinal 
lines; buds large, glabrous, stalked; a shrub or small tree. 
Acer pcnnsylvanicmn L. Striped Maple. 
1. Axillary buds not covered by the petiole base; twigs not striped. 2. 
2. Older twigs with prominent, longitudinal, corky ridges; cultivated, 
from Europe. Acer campestre L. English Maple. 
2. Twigs without corky ridges. :5. 
