Etymology: Penthorum: from pente for "five" and oros for "a mark," referring to order of fives of flower
Plants: erect, perennial, 6"-28" tall forb, simple or branched near the top
Leaves: alternate, sharply toothed, lance-like to elliptical, pointed at both ends
Flowers: green to white, 5-parted, 1/4" wide; inflorescence 3/4"-3" wide, flattish, terminal cluster (cyme) with stalked flowers seemingly from one side of the often curved, 2-4 branches; blooms July-Sept.
Fruits: 1/5" wide capsule
Habitat: wet; shores, streambanks; in muddy soil
Conservation Status: Native
Flora of North America: Flora of North America Floristic Rating: Coefficient of Conservatism = 3, Wetland Indicator = OBL USDA Plants Database: Federal Distribution and detailed information including photos USDA Agricultural Research Service (ARS): Images of seeds, fruits, embryos, etc. Dan Tenaglia's The Missouri Flora: Fabulous photographs; detailed descriptions; color and leave arrangement key. David G. Smith's "Delaware Wilflowers": Beautiful photographs; descriptions Illinois Wildflowers: Wonderful photographs; detailed descriptions; color and leaf arrangement key Southwest School of Botanical Medicine: Britton & Brown Illustrated Flora - 2nd Edition (1913) "An Illustrated Flora of the Northern United States and Canada"