Affinities: Europe and Northeast America. 
315 
2. Plants common to Europe and northeast America. 
The species of plants which are common to Europe and northeast United 
States can be divided into four classes. 
all having a north or northwestward range found mostly on the highest summits 
of the White Mountains, the Adirondacks and in other elevated situations, may 
be enumerated as follows: 
Cardamine bellidifolia L. 
Viola palustris L. 
Silene acaulis L. 
Sibbaldia procumbens L. (= 
Sibbaldii Hall. f.). 
Potentilla frigida Vill. 
Saxifraga rivularis L. 
> stellaris L. var. comosa Poir. 
Epilobium alpinum L. 
Epilobium alpinum L. var. majus Wahl. 
(=EE. origanifolium Lam.). 
Gnaphalium supinum L. 
Vaccinium uliginosum L. 
Arctostaphylos alpina Spreng. 
Cassiope hypnoides D. Don. 
Bryanthus taxifolius A. Gray. 
Rhododendron lapponicum Wahlenb. 
Loiseleuria procumbens Desv. 
Veronica alpina L. 
Castilleja pallida Kunth. 
Euphrasia officinalis L. 
Diapensia lapponica L.') 
Potentilla 
| 
First, the strictly alpine species, 
Polygonum viviparum L. 
Oxyria digyna L. 
Empetrum nigrum L. 
Salix herbacea L. 
Luzula arcuata Sw. 
» spicata DC. 
Juncus trifidus L. 
Scirpus caespitosus L. 
Carex scirpoides Michx. 
» capitata L. 
» canescens L. 
» _ caespitosa L. 
Phleum alpinum L. 
Agrostis canina L. 
Pca laxa Haenke. 
Festuca ovina L. 
Triticum violaceum Hornem. (= Agro- 
pyron violaceum Vasey). 
Aira atropurpurea Wahlenb. 
Hierochloe alpina Roem. & Schult. 
The forty species comprise all those found in the alpine region of the 
northeastern states, and there are but nine species found here, which are 
not also found in Europe. 
These are as follows: 
Arenaria groenlandica Spreng. Prenanthes (Nabalus) nanus DC. 
Geum radiatum var. Peckii (=G. macro- » (Nabalus) Boottii D. Dietr. 
phyllum Pursh). Vaccinium caespitosum Michx. 
Solidago thyrsoidea E. Mey. Salix Cutleri Tuckerm. 
Arnica Chamissonis Less. (=A.mollis | Calamagrostis Pickeringii A. Gray. 
Hook.). 
1) See plate II, p. 188. — Cornus canadensis is nearly allied to the European species Cornus 
suecica L 
