Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
prātensis, e, adj. [pratum], growing or found in meadows, meadow-: fungi, Hor. S. 2, 4, 20: faenum, Col. 6, 3: flores, Plin. 21, 8, 25, § 49: pastinaca, id. 21, 15, 50, § 86.