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.