1. [n]  tall showy tropical American annual having hairy stems and long spikes of usually red flowers above leaves deeply flushed with purple; seeds often used as cereal
2. [n]  perennial of southwestern United States having leathery blue-green pinnatifid leaves and thick plumelike spikes of yellow flowers; sometimes placed in genus Cleome
3. [n]  annual with broadly ovate leaves and slender drooping spikes of crimson flowers; southeastern Asia and Australia; naturalized in North America

PRINCE'S-PLUME is a 14 letter word that starts with P.