Etymology: Sium: from sion, a Greek name of some marsh plant
Plants: erect, (annual?)/perennial, 2'-6' tall, smooth forb; stems solitary, branching, angular, stout; roots fibrous
Leaves: once pinnately-divided into 7-17 long, narrow, sharply-toothed leaflets
Flowers: white, 5-parted, the outer petals sometimes slightly larger; inflorescence a 1 1/2"-4 1/2" compound umbel with 6 or more compact umbellets; blooms July-Aug.
Fruits: oval, dry, obviously ribbed, splitting into 2 seeds- fruit: seed:
Habitat: sun; wet; shallows, shores; in water or muck
Conservation Status: Native
Floristic Rating: Coefficient of Conservatism = 5, Wetland Indicator = OBL Atlas of the Wisconsin Prairie and Savanna Flora: by T.S. Cochrane & H.H. Iltis: habitat, distribution infomation / flowering and fruiting times USDA Plants Database: Federal Distribution and detailed information including photos Dan Tenaglia's The Missouri Flora: Fabulous photographs; detailed descriptions; color and leave arrangement key. Southwest School of Botanical Medicine: Britton & Brown Illustrated Flora - 2nd Edition (1913) "An Illustrated Flora of the Northern United States and Canada"