Alleghanian—Ozark Distriet: Lacustrine Area. 499 
Strophostyles helvola, Potentilla supina, P. anserina, Coreopsis (Bidens) dis- 
coidea, Artemisia caudata, Polygonella articulata, Euphorbia polygonifolia, 
Funcus balticus var. littoralis, Cyperus Schweinitzü, Scirpus Smithii, Sporobolus 
cryptandrus, Ammophıla arenaria, Equisetum variegatum'). 
The eastern shore of Oneida Lake in central New York is a broad beach of white sand 
from 100 to 300 feet in width2). It is particularly rich in cyperaceous plants such as, Cyperus 
rivularis, C, aristatus (= C. inflexus), C. ging C. filiceulmis, Fimbristylis autumnalis, Seirpus 
Smithii, S. pungens (= S. americanus), Hemicarpha micrantha, Eleocharis acicularis, E. intermedia 
associated with several flowering plants, viz., Lathyrus maritimus, Polygonella articulatı. The 
occasional sandy DERUER of the southern shore present about the same plants as those of the 
eastern shore. At Lewis Point grow in addition peu: littorale, E. hyemale var. intermedi 
Dryopteris simulata, Botrychle um obliquum var, oneidense (at high-water mark) Ophioglossum vi 
gatum nearer the water. Onondaga Lake shows a ee of maritime species. At this lake 
several en E are found but it lacks how the extensive sandy beaches of Oneida Lake. 
The shore of Lake Erie at Buffalo?) is ee by Cakile americana, Lathyrus mari- 
a: polygonifolia, Triodia purpurea, Hudsonia tomentosa and several öther lake shore 
plants not known inland or on the Atlantic sea coast, viz., Artemisia Eee Glyeyrrhiza lep- 
idota, Corispermum ee Here Ptelea trifoliata, Juniperus communis, Lithospermum 
hirtum, are always lake shore plan t Presque Isle, re on the shores of Lake 
Erie (See JENNINGS#), pages 309 es Ben _ Juncus bakieih: Strophostyles helvola (= S. angu- 
losa), ee ila arenaria, ie ngia purpurea, Cakile rege Lathyrus maritimus, Euphorbia 
en The shore the et Ber of e Michigan is EEE by a 
low gebeir h on a grow Lathyrus maritimus, Cakde americana, Euphorbia polygonifolia, 
Een era Juncus balticus, Cnicus (Cirsium) Pitcheri5), Corispermum hyssopifolium, Prunus 
pumila, Populus monilifera. 
Sand Dune Formation. The sand dunes of the Lacustrine Area are typi- 
cally developed in northwest Indiana along the shores of Lake Michigan and 
we are indebted to COWLES for a description of the ecologic and floristic as- 
pects of the same as well as for the Succession of the vegetation as influenced 
by the physiographic conditions‘). 
he dunes of this region are held in place by Ammophila arenaria, Elymus canadensis, 
Calamagrostis longifolia (the two latter of less importance) also Andropogon scoparius, A. furcatus, 
Chrysopogon natans, Eatonia obtusata. Certain shrubs occur: Salix adenophylla, S. glaucophylla, 
Prunus pumila, Cornus stolonifera, C. Baileyi, Populus monilifera with which dune formers are 
associated Artemisia canadensis, Cnicus Pitcheri, Lathyrus maritimus, Euphorbia polygonifolia, 
1) BECKWITH, FLORENCE, MACAULEY, MARY E. and FULLER, ei B.: Plants of Monroe 
2% New Vork. Proceedings Rochester Academy Science II, 1906. 
2) House, Homer D.: Notes on the Flora of Oneida Lake And“ ieiaiky Torreya IH: 165 
Nov. 190 
3) Dar, Davıp F.: The Plants of Buffalo and Vicinity. Bulletin of the Buffalo Society Natural 
History IV: 71 
4) Jennises, Orto E.: A botanical Survey of Presque Isle, Erie County, Pennsylvania... Annals 
of the Carnegie Museum V: 289—417 with many fine plates XXII—LI; a paper printed, since this 
book went to er and too detailed for a brief addition of its contents in the galley proof. 
5) B W. J.: A Stroll along the Beach of Lake Michigan. American t IV: 
156-366 allen, L. H.: Michigan Lake shore Plants. ‘The Botanical Gazette V; 90. 
6) Cowıes, HENRY C.: The ecological Relations of the Vegetation of the sand Dwnes of 
Lake Michigan Botanical Gazette XXVII: 95, 167, 281. 
32* 
