having a small, stiff, bristle-like tip; a diminutive of aristate
• (a.) Having a short beard or awn.
Having a small bristle-like appendage. ... (09 Oct 1997) ... 
A·ris'tu·late adjective [ Dim. from arista .] (Botany) Having a short beard or awn. Gray. 
aristulate Having a small awn (a slender, bristlelike appendage found on the spikelets of many grasses).