PEARLWORT
pearlwort, pearlweed, pearl-weed
(noun) any of various low-growing plants of the genus Sagina having small spherical flowers resembling pearls
Source: WordNet® 3.1
Etymology
Noun
pearlwort (countable and uncountable, plural pearlworts)
Any of several flowering plants that have flowers the shape and size of small pearls
in genus Sagina,
in genus Colobanthus
Source: Wiktionary
Pearl"wort`, n. (Bot.)
Definition: A name given to several species of Sagina, low and
inconspicuous herbs of the Chickweed family.
Source: Webster’s Unabridged Dictionary 1913 Edition