Sentence:  <WSD>Arrowroots</WSD> were introduced into the area in early 1983 by an elderly citizen known as Mr. Awondo, who brought it from Central Kenya where it is planted in the moist river beds. ... <WSD>Arrowroots</WSD> thrive where there is enough moisture in the soil for its normal growth and development. 
Meaning of the word marked with <WSD> tags:  "Maranta arundinacea" from the Marantaceae family, a large perennial herb native to the Caribbean area with green leaves about 15 centimeters long with white stripes. (from late 17th c.)