Palea

Definition and stakes

H. Marshall Ward,  Grasses

“ Inside them the axis or stalk (rachis) is continued for a short distance only and on its sides are hinged two86 other pairs of more or less boat-shaped scales, smaller and more delicate than the glumes, and known as the pales (paleæ) , while a third pair of still smaller pales is fixed to the end of the axis. In each case one smaller and more delicate inner palea is hinged just inside its more obvious outer palea. In the closed condition of the spikelet each of the three pairs of pales is shut together, and pressed close to the axis, and the pair of glumes shut in the whole. ”
Source: Gutenberg

H. Marshall Ward,  Grasses

“ Aira is distinguished by the awn: Agrostis by the very different paleæ and caryopsis.
The other Poas are devoid of web, though they may have hairs below, and require very careful examination. The whole group is excessively difficult to deal with in “seed," and a special study of it is needed, since several species are important, and it forms a type.
(b) No web or pencil of hairs below the “seed."
(1) Apex of palea rounded, blunt, notched, or at most bluntly pointed, but with no trace of awn-or bristle-tip.
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✲ Palea inflated, round-backed and somewhat winged, membranous.
”
Source: Gutenberg

Portrait of Franz Thonner Franz Thonner,  The flowering plants of Africa (1915)

“ Inflorescence consisting of spikelets, rarely of single flowers, usually enclosed by 2 glumes (outer or empty glumes) and arranged in spikes, racemes, or panicles. Flowers in the axil of the flowering glume (or valve) , subtended by the usually 2-keeled palea and sometimes by one or two, rarely more, minute lodicules. Perianth none. Stamens 1-6, usually 3. Anthers opening by 2 slits or pores. Ovary 1-celled. Ovule 1, erect or laterally affixed, slightly curved, with the micropyle turned downwards. Styles 2, rarely 3 or 1. Fruit indehiscent; pericarp usually dry and adnate to the seed. ”
Source: Gutenberg

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