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STUDIES IN PH LE UM ARENARIUM
373
Lowcst brcinches of inflorescence
out-standing, always distinctly visible.
Spikelets 3.5—5 mm in length.
Glumes narrow lanceolate-linear, long
and narrowly acuminated into an
arista; tbis>l mm in length.
Glumella 1.5—2 mm in length.
At present Phl. himakiicum is recorded from Afghanistan, NW.
Himalaya and Kashmir. The statement in »Flora URSS» (1934, p. 130)
that the Himalayan form should be »PM. graeum» (= Phl. exaratum
Griseb.) is consequently wrong.
Lowest branches of inflorescence
pres-sed to the central axis, hidden by
the spikelets.
Spikelets 2—3 mm in length.
Glumes lanceolate-oblong, ± shortlv
acuminated into an arista; this
0.2—0.7 mm in length.
Glumella 0.7—1.5 mm in length.
3. Distribution.
The material of localities (>550) whereupon the maps (Fig. 1, 2
and 3) and the following discussion are based has been brought together
from the public herbaria mentioned above, from personal informations
and from statements in the literature.
The maps ön the distribution of this species show a verv striking
confinement to the coasts as a characteristic feature. Within Northern
Europé inland localities occur to a larger extent only in eastern Scania
and in the middle part of Öland. However, it should be remarked
that none of these localities is situated at a möre considerable distance
from the sea-beaches. In Central and Southern Europé there are in a
high degree analogous conditions, but here there are also often rather
isolated localities in ihe inland. The most noteworthy of these are the
following: Ihe Rhine Valley in both the upper and lower sections —
round Mainz in several localities —; some previously stated localities
ön the moors of Norfolk in Southern England (Smith 1824); the Seine
basin round and NW of Paris; the Rhone Valley up to Lyon and the
districts SW of that town and finally the lately discovered localities
in the Atlas Mountains at a height of 1,500 m above sea-level.
The map of the total distribution (Fig. 1) shows clearly that the
centre of distribution of that species is situated at the Atlantic coast
of Central Europé, where the frequency is verv high and the distribution
area is confluent. Good examples of the frequency of the species within
its central area are the maps of the distribution in the Netherlands
(Sloff 1942, p. 432) and Belgium (Massart 1910b, map 3). In a
north and south direction the distribution area becomes möre split up.
The furthest outposts to the NE are localities, highlv influenced by
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