416 HARPER: VEGETATION OF THE COASTAL PLAIN 
In 1906 I passed through this region from about Lake Wacca- 
maw to Wilmington, 36 miles, and from Wilmington to the northern 
boundary of Pender County, 35 miles; and in 1909 from Rosin- 
dale to Wilmington, 37 miles, and Wilmington to Verona, 43 miles. 
The following list of plants has been compiled from the notes of 
both trips in the manner previously described. In my account 
of the first trip * I gave a systematic list of species which seemed 
to be more abundant near Wilmington than in some other places. 
As might have been expected, the present list, which shows ap- 
proximately the relative abundance of some of the more conspicu- 
ous plants in the Cape Fear region, contains many of the same 
species, though the two lists are by no means identical. 
TREES 
18+53 Pinus ea 2+12 Taxodium imbricarium 
17+40 Pinus s 74+7 Taxodium distichum 
12+26 aay ser 4+7 Quercus marylandica 
I1+27 Gordonia Lasianthus 5+6 Liriodendron Tulipifera 
13+15 Pinus Taeda o+ 9 Acer rubrum 
3+22 Nyssa biflora t+8 Quercus falcata 
5+20 Quercus Catesbaei 0+3 Persea pubescens 
3+12 Cornus florida 2+1 Quercus cinerea 
6+9 Liquidambar Styraciflua 
SHRUBS 
12+20 Clethra alnifolia 6+10 Myrica cerifera 
4+27 Smilax laurifolia 2+10 Ilex glabra 
7+20 Cyrilla racemiflora 1+4 Phoradendron flavescens 
3+15 Myrica pumila 2+2 Amorpha herbacea 
HERBS 
19+31 Sarracenia flava 3+3 Chondrophora nudata 
Q+22 Aristida stricta 3+3 Tillandsia usneoides 
ns), 35-8; Lumberton, N. C., 41.2; Florence, S. C., 46.1; Statesburg, S. C., 41.7; 
Blackville, S. C., 42.5; St. George, S. C., 47.8; Altamaha Grit region of Georgia, 
43-9 per cent. The Piedmont region seems to have about 35 per cent. of its annual 
rainfall in these four months. 
Mere distance from the coast does not seem to have much to do with these figures, 
as shown by the great difference between those for Wilmington and Cape Hatteras. 
Latitude and altitude are probably equally inadequate to explain the variation. In 
general a heavy summer rainfall (in Eastern North America at least) seems to cor- 
respond approximately with pioneer vegetation, such as open pine forests. But this 
seasonal distribution of precipitation could hardly be considered the sole cause of 
the condition of the vegetation, for that can often be correlated with soil and geo- 
logical history. May not this type of az then perhaps be partly the effect 
rather than the cause of igi vegetation 
*Bull. Torrey Club 34: 365. 10907. 
tOften only a shrub 
