compass-plant, prickly lettuce
[Lactuca integrata (Gren. & Godr.) A.Nelson, more...]
Etymology: Lactuca: name for "milk"
Plants: erect, annual/biennial, 1'-5' tall forb with milky juice; stems leafy, smooth except for prickles at the bottom
Leaves: varying from entire, toothed, to pinnately-divided with narrow to arrow-shaped base, spiny edges and midrib
Flowers: head 3/8" wide with 18-24 yellow rays, drying to a bluish-white; inflorescence with many heads in a long, conical, loosely-branched cluster; blooms July-Sept.
Fruits: dry seed with several obvious lines on both sides
Habitat: disturbed sites, fields
Hazardous: Careful, this plant is hazardous!
Conservation Status: Introduced - naturalized
Flora of North America: Flora of North America Floristic Rating: Wetland Indicator = FAC 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"