Lysimachia ciliata (Fringed Loosestrife)

USDA-NRCS PLANTS Database / USDA NRCS. Wetland flora: Field office illustrated guide to plant species. USDA Natural Resources Conservation Service.

Where Commonly Found: Floodplains, wetland margins, shores of rivers and lakes, forest, meadows, fields, CT, MA, ME NH, NY, RI, VT.
How to Identify:
(For unfamiliar words: Wikipedia Glossary of Botanical Terms).
Go Botany Key to Lysimachia ciliata.
Illinois Wildflower site for Lysimachia ciliata.
Flower Type:  Individual downward facing flowers appear on light green, hairless pedicels that are up to 3″ long, along the axils of the middle and upper leaves.  Flowering is over a long period with only a few flowers at a time.  The flower is composed of 5 spread-out  yellow petal-lobes that taper to pointed tips and often reddish toward the flower center.  Flower time is July – August.
Leaf Arrangement:  Opposite leaves paired on unbranched or sparingly branched fairly erect, light green and glabrous stem.
Leaf Type:  Medium green, lanceolate to ovate leaf blades are up to 6″ long and 2.5″ across are  hairless with smooth margins.  The leaf petioles are 1.5″ long and ciliate, hence the name.
Height:  3′-5′
Seed Collection:  Flowers are followed by green, shiny globoid seed capsules, allow to dry on plants before collecting.

Attracts:  Bees
Use:  Naturalizing
Light:  Part Shade to Full Shade
Hardiness Zone:  4 to 8   USDA Zone Map
Soils:  Moist to Wet
Notes:  Lysimachia ciliarta (Fringed Loosestrife) is a nice shade-tolerant plant for damp woodlands that can colonize to form a tall ground cover.  It is NOT related to Purple Loosestrife.
Native to most of the US, except SW US:  Biota of North America (BONAP) – North America Plant Atlas (NAPA).