Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
pōpŭlĕus, a, um, adj. [2. populus], of or belonging to poplars, poplar-: frus, Enn. ap. Aus. Idyll. 5, 160 (Ann. v. 562 Vahl.): frondes, Verg. A. 8, 32; 10, 190; cf. Cato ap. Plin. 16, 21, 38: corona, Hor. C. 1, 7, 23: umbra, Verg. G. 4, 511: silva, Sen. Herc. Oet. 1641.