Kœleria cristata, Pers. (Fig. [62]).
Palea 6 mm., keeled, entire, no awn but stiffly tapering, ribbed, no hairs. Rachilla large. Fruit 4·5 mm.
| Fig. 61. Molinia cærulea. a, "seed," nat. size; b and c, ditto, × about 8; d, the caryopsis, nat. size; e, ditto, × about 7. Note the compressed, keeled and glabrous palea, and the long slender bone-shaped rachilla. Nobbe. | Fig. 62. Kœleria cristata. a, the “seed" (to the left) and caryopsis (to the right), nat. size; b, “seed," × about 7. The palea is compressed and keeled, and, like the large rachilla, glabrous. Nobbe. |
✲✲ Palea not taper pointed, but mucronate, or two-toothed, with a sub-terminal point or spine.
Elymus arenarius.
Agropyrum repens.
Dactylis glomerata.
Sesleria cærulea.
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Elymus arenarius. Agropyrum repens. Dactylis glomerata. Sesleria cærulea. |
Elymus arenarius, L. (Fig. [63]).
Fruiting palea lanceolate, 13-15 × 3 mm., tough and stiffly hairy or velvety: 5-7 ribs. Rachilla stout, hairy. Fruit hairy above, 5-11 mm. × 2·5 × 1·2, somewhat grooved. No keel. Apex of inner palea bifid, outer mucronate. Fruit shelled.
Easily distinguished from Digraphis arundinacea, which has a basal hair-tuft and very different caryopsis; less easily from Agropyrum and Lolium, except in the velvety surface.
| Fig. 63. Elymus arenarius. a, “seed," nat. size; b and c, the same, × 3. Note the stiff, velvety, bifid and mucronate outer palea, and the large hairy rachilla. Nobbe. | Fig. 64. Dactylis glomerata. a, spikelet with glumes removed, nat. size; b, ditto, × about 6; c and d, “seed," nat. size (below) and × about 6. The stiff and slightly curved awn-point is sub-terminal and arises from between two teeth. Rachilla dilated above. Nobbe. Cf. Fig. [60]. |