From The Collaborative International Dictionary of English v.0.48 :
Starwort \Star"wort`\ (st[aum]r"w[^u]rt`), n. (Bot.)
(a) Any plant of the genus Aster. See Aster.
(b) A small plant of the genus Stellaria, having
star-shaped flowers; star flower; chickweed. --Gray.
[1913 Webster]
Water+starwort,+an+aquatic+plant+({Callitriche+verna">Water starwort, an aquatic plant ({Callitriche verna)
having some resemblance to chickweed.
Yellow starwort, a plant of the genus Inula; elecampane.
[1913 Webster]
From WordNet (r) 3.0 (2006) :
starwort
n 1: low-growing north temperate herb having small white star-
shaped flowers; named for its alleged ability to ease sharp
pains in the side [syn: stitchwort, greater stitchwort,
starwort, Stellaria holostea]