Dig deeper at SERNEC, a consortium of southeastern herbaria.
Spermatophytes (seed plants): Angiosperms (flowering plants): Eudicots: Core Eudicots: Asterids: Ericales
Britton & Brown Illus Flora of Northeast US & adjacent Canada (Gleason, 1952)
Prairie Loosestrife, Smooth Loosestrife, Four-flowered Loosestrife
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Richard and Teresa Ware rtw_l_quadriflora_2
Leaves stiff, ascending, linear. Flowers concentrated mostly in upper plant, per Wildflowers of the Southern Mountains.