PIMPLE IN A BENT

BENT 
1. grass of a reedy or rush-like habit, or which has persistent stiff or rigid stems; also  various grass-like reeds, rushes, sedges, and other plants
2. the stiff flower-stalk of grasses

CLICK HERE FOR KEY TO SOURCES

From: Censura Literaria: 
Containing Titles, Abstracts, and Opinions of Old English Books,
Especially Those Which are Scarce.
By Samuel Egerton Brydges
Volume IV. Being the First of the New Series. 1807
Number XV. (Being the Third Number of Vol. IV.)
Art. I. The First Foure Bookes of Virgil's Aeneis,
translated into English heroicall verse by Richard Stanyhurst
P. 228