194 Part II. 
Eu. — Arctostaphylusalpina Spreng. — 
ı Cassiope Mertensiana Bong. 
._— .» tetragona L. 
ı Bryanthus (Phyllodoce) empetri- 
formis Gray 42°. 
(Phyllodoce) glanduli- 
florus Gray 49°. 
. — RhododendronlapponicumL. — 
Dodecatheon pauciflorum Durand. 
I » 
Eu. — Primula farinosa L. 
» mistassinica Michx. 
»  angustifolia Torr. 
»  Parıyi Gray. 
Douglasia nivalis Lindl. 
» montana Gray. 
Eu.— Androsace chamaejasme Host. 
—_ » filiformis Retz. 
Gentiana (Anthopogon) barbellata 
Engelm. 
tenella A. Gray (Amarella 
monantha A. Nels.). — 
propinqua Richards. 
arctophila Griseb. 
prostrata var. americana 
Hook. (Chondrophylla 
americana Engelm.). 
glauca Pall. 
frigida Hke. (Gray.) 
(Dasystephana) Roman- 
zovii Ledb. 
Eu. 
Chapter 2. 
Gentiana (Dasystephana) Parryi 
Engelm. 
(Dasystephana) affınis 
Griseb. 
' Eu. ı — Pleurogyne rotata Grsb. — 39°. 
Eu. — Sweertia perennis L. (P. fontana 
A. Nels.). 
Eritrichium aretioides DC. 
Mertensia oblongifolia Hook. 
paniculata Ait. var. nivalis 
ii 
I > 
I B 
» alpina Torr. [Wats. 
» Parıyi Rydb. 
Pentstemon Hallii Gray. 
> secundiflorus Benth. 
» humilis Nutt. 
» Harbourii Gray. 
Chionophila Jamesii Benth. 
Synthyris (Besseya) alpina Gray. 
» plantaginea Benth. 
Veronica Cusickii Gray. 
Eu. — >» 
Castilleia breviflora Gray (C. bra- 
chyantha Rydb.). 
» occidentalis Torr. 
> oreophila Greene. 
ı Pedicularis (Elephantella) groen- 
landica Retz. — 
> Parryi Gray. 
» scopulorum Gray. 
Eu. — >» flammea L. — 
This table shows that the endemic alpine - plants are present in large 
numbers on the Rocky Mountains and that they are related to genera W 
occur at the foot of the mountains. Species which retreated and whi 
during the Tertiary period in North America are not present noW. 
hich 
ch existed 
Such 
plants as (to make a comparison with some European types of restricted distri- 
bution) Dioscorea pyrenaica and Ramondia pyrenaica, 
which may have ori- 
ginated in earlier periods and under suitable conditions persisted through the 
glacial period are sparingly present in the mountain flora. 
also belongs in all probability Douglasia nivalis, Bryanthus empe trıfo 
Bryanthus glanduliflorus and Chionophila Jamesii. It may be stated 
mation, that the endemic alpine flora of these mountains was in all pr 
To this category 
mis, 
in sum- 
obability 
first developed after the continental ice sheet had withdrawn itself. 
