Bogs and Acidic Peatlands of Southern New England by Marsha C. Salett
Lysimachia thyrsiflora L.
PRIMULACEAE (Primrose Family)
EtymologyLysimachia is either named for King Lysimachos of Thrace or is derived from the Greek word "lysimachos:" lysis = release or loosening + machos = strife; hence the English name loosestrife; thyrsiflora means with flowers in a thyrse, which is a type of compact, many-flowered, panicle.
DescriptionTufted loosestrife is a medium, perennial herb of swamps and bogs that grows to 3' high. Fuzzy, yellow tufts of flowers bloom in short racemes in axils of the middle leaves.
Wetland indicator statusOBL
Plant Height1-3 feet
LeavesOpposite, simple, entire, 2-4" long; lanceolate, punctate -- dotted with pits or glands.
Flower/InflorescenceYellow, small (1/4"), 5-6 petals, densely clustered in short (5/16 -1") racemes; on long stalks arising from axils of middle leaves.
Flowering PeriodMay-July
FruitSmall (1/4"), roundish capsule.
HabitatBogs and swamps.
RangeLabrador to Alaska; south to New Jersey, Ohio, and Missouri.
(c) 1998-2006 Marsha C. Salett