Practice question

Lemma and palea are paired bracts enclosing individual grass floret, fundamental unit of Poaceae spikelet. Lemma is outer, typically larger, five-nerved often bearing dorsal awn, interpreted as reduced bract; palea inner two-keeled, subtending flower comprising lodicules, three stamens and single carpel. Spikelet consists of two empty basal glumes plus one to many lemma-palea complexes arranged distichously. Fabaceae possesses vexillary standard wing keel, Malvaceae epicalyx, Solanaceae persistent calyx. Lemma-palea architecture controls floret opening and protects developing caryopsis, constituting defining spikelet morphology for cereal taxonomy and identification.