Plant: Annual forb Leaves: leaves opposite, petiolate to sessile, serrate-toothed Flowers: flowers axillary on long peduncles, corollas yellow, bilabiate Fruit: a capsule. Notes: calyx inflated when in fruit, tan and ribbed References: J.C. Hickman, ed. The Jepson Manual.W.B. McDougal. Seed plants of Northern Arizona.ASU specimens.