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Nature in Wales


Vol. 3, no. 2 Summer 1957

Poa Pratensis subspecies Subaerulea, in north Glamorgan and south Brecon

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The length of Rhizome internodes varied within and between
rhizomes and plants. The following mean lengths have been
recorded from 3 clones in the Cwmdare area 22.85 ± 2.45 mms,
16.20 ± 0.58 mms., and 15.33 ± 0.59 mms.; having an overall
average of 16.61 mms per internode for 185 measurements.
A germination test was carried out on a small amount of seed
and showed a high percentage of polyembryony, a feature very
common in Poa pratensis (Akerberg 1942) and illustrated below for
transplants (100 seeds) and wild plants (200 seeds).
No. seeds Seedlings/seed Polyembryony Germination.
1 2 3 4
100 66 15 7 2 24 90
200 132 18 1 9.5 75.5
It is of interest to note that several fungi have been recorded on
the foliage, namely Puccinia poarum, Uromyces poae and Erysiphe
graminis, whilst Ergot (Claviceps purpurea) was found on several plants
from Craig-y-Llyn, N. Glamorgan.
From the field work already carried out it is clear that sub-
caerulea is very common in the hill country of South Wales, being
found in a wide range of habitats but being characteristic of grass-
lands on which stock concentration and agricultural activities are
high. The floral morphology of the subspecies is remarkably
uniform and the comparatively small panicles are readily recognised.
The sterile tillers are broad-leaved, and although leaf length is
variable in some populations, plants are normally short-leaved
under field conditions. However, a fuller evaluation of all charac-
ters depends upon detailed transplant studies.
In conclusion I should like to thank the Director, Royal
Botanic Gardens, for the identification of some specimens, and
Dr. A. Melderis, Science Museum (Natural History) for his
opinion of some of the plants.
Akerberg, E. (1942). Hereditas 28, 1-126
Gustaffson, A. (1947). Acta Univ. Lund., 43, No. 12, 183-370.
Hubbard, G. E. (1954). Grasses: Penguin Books.
HYDE H. A. and WADE, A. E. (1934). Welsh Flowering Plants.
LovE, A. (1952). Hereditas, 38, 11-32.
Melderis, A. (1955). Species Studies in the British Flora. Bot Soc., B.I., Symp.
3 140-159.
Tutin, T. G. (1952). Flora of the British Isles.
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