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Bruso, George H.
Collinsonia canadensis L.
Citronella horsebalm, Richweed, Stoneroot
USDA Symbol: coca4
USDA Native Status: L48 (N), CAN (N)
A coarse perennial, up to 5 ft. tall, with large, oval, toothed leaves to the top of the stalk, and long, branched, terminal spikes of small, yellow flowers which stand above the leaves. The lower lip of each flower is fringed and extends beyond the upper lip. These flowers have a distinct lemony odor.
This tall wildflower is typical of moist woodlands. Its foliage as well as its flowers have a citronella-like odor. Tea can be brewed from the leaves, and the rhizome was formerly used as a diuretic, tonic, and astringent.
Plant CharacteristicsDuration: Perennial Habit: Herb Flower:
Fruit: Size Class:
Bloom InformationBloom Color: Yellow
Bloom Time: Jul , Aug , Sep
, WV Canada: ON Native Distribution: FL
n. to NH,
Ont. & c. IL Native Habitat:
Moist, rich, rocky woods
Growing ConditionsLight Requirement: Part Shade
Soil pH: Circumneutral (pH 6.8-7.2)
Soil Description: Humus-rich soil.
Conditions Comments: Easy to care for and pest free. Benefits from wintercover. Foliage is sensitive to frost.
National Wetland Indicator Status
This information is derived from the U.S. Army Corps of Engineers National Wetland Plant List, Version 3.1
(Lichvar, R.W. 2013. The National Wetland Plant List: 2013 wetland ratings. Phytoneuron 2013-49: 1-241). Click here
for map of regions.
From the National Organizations Directory
According to the species list provided by Affiliate Organizations, this plant is either on display or available from the following:
Mt. Cuba Center
- Hockessin, DE
Record Last Modified: 2007-01-01
Research By: TWC Staff