1899] Porter, — Flora of the Pocono Plateau 183 
which are evident in vast accumulations of drift and numerous ponds, 
lakes and sphagnum-bogs. Its flora, therefore, is largely northern in 
its character and the conditions being very favorable to the growth of 
the shrubby Lricaceae, other companions of the Rhodora appear, such 
as Ledum Groenlandicum (L. latifolium, Ait.), Kalmia glauca, An- 
dromeda polifolia, Cassandra calyculata, Chiogenes hispidula (C. ser- 
pylifolia, Salisb.), Vaccinium Canadense and Vaccinium Oxycoccus. 
Amongst the trees and other shrubs, Picea Mariana (P. nigra, Link), 
Abies balsamea, Larix laricina (L. Americana, Michx.), Myrica Gale, 
Betula populifolia, Pyrus Americana, Nemopanthes Canadensis ( Nemo- 
panthus fascicularis, Raf.) and Viburnum lantanoides abound, whilst 
Pinus resinosa, Betula papyrifera and Lonicera caerulea are scarce and 
local. 
The following list of seventy additional species, most of which, as 
far as known, do not occur further south, will best exhibit the northern 
character of the flora. Itmight be increased and, if the whole territory 
in the State, above the bowlder line, were included, the number could 
be more than doubled : — 
Botrychium simplex Eriophorum vaginatum 
B. lanceolatum Carex pauciflora 
B. matricaria C. oligosperma 
Dryopteris Braunii C. retrorsa 
(Aspidium aculeatum, Swartz, C. Schweinitzit 
var. Braunit, Koch) C. Goodenovit 
D. simulata ( C. rigida, Good., var. Goode- 
(Aspidium simulatum, Daven- novit, Bailey) 
port) C. limosa 
Potamogeton Oakesiana C. Magellanica 
Scheuchzeria palustris C. longirostris 
Panicum xanthophysum C. arctata 
Oryzopsis juncea C. deflexa 
(O. Canadensis, Torr.) C. pallescens 
Milium effusum C. chordorhiza 
Cinna latifolia (C. pendula, Trin.) C. tenella 
Avena striata C. Deweyana 
Poa debilis Calla palustris 
Panicularia laxa Xyris montana 
(Glyceria laxa, Scribner) (X. flexuosa, Muhl., var. pu- 
Agropyron caninum silla, Gray) 
