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Nature in Wales

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Vol. 3, no. 2 Summer 1957

Poa Pratensis subspecies Subaerulea, in north Glamorgan and south Brecon

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collected in the Cwmdare area (N. Glam.) the following measure-
ments were obtained, though a true comparison between plants, as
with all characters, depends on transplant data from tillers of corres-
ponding growth stage.
Plant A-Fertile Tiller. Plant B-Sterile tiller
Leaf Width Length Leaf Width Length
(mms.) (mms.) (mms.) (mms.)
1* — 167 1* 52
2* — 260 2* 2.5 56
3* — 282 3 2.6 59
4* 2.5 335 4 2.7 59
5* 325 5 2-7 65
6* 3-4 336
7 3-2 157
8 3.5 121
9 3.9 171
10 3-8 119
11 Flag leaf in bud
Seed production, as was to be expected from panicle mor-
phology, was not very high, and at Pontpren, Penderyn, was 61-0
± 5·77 caryopses/panicle. Whilst seed size is difficult to measure
it was decided to determine the length of caryopses by means of a
low power micrometer eye-piece, and an average of 3.07 mms.
(range 2-5-3-8 mms.) was obtained.
*dead or partly green leaves at base of tiller.
Fig. 1. Caryopsis length in subcaerulea.
Caryopsis length in mm.
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