- Woody, multiple. A shrub to +3m tall. Young branches pubescent.
- Alternate, odd-pinnate. Leaflets typically oblong, entire, mucronate, opposite, pubescent to glabrous above and below.
- Terminal and axillary racemes to +15cm long, +/-1.3cm in diameter. Pedicels to 3mm long.
- Corolla of single petal, deep violet-purple, to 5mm long. Petal falsely tubular and surrounding other floral organs. Stamens 10, monodelphous, slightly exserted. Filaments glabrous, white, 4-5mm long. Anthers orange, .6mm long. Style purplish, pubescent, 5mm long, exserted. Fruits to 7mm long, glabrous or sparsely pubescent. Calyx pubescent, tubular, campanulate, 2.5mm long, 5-lobed. Lobes unequal, shallow. Lowest lobe acute.
- May - June.
- Moist ground, gravel bars. Also cultivated.
- Native to U.S.
- This striking shrub can be found throughout Missouri.
I believe Steyermark lists 5 varieties for this plant mostly based on leaf and stem pubescence. I won't go into those here. There is also a hybrid plant between
. This plant is called
The genus name means "without shape", referring to the single-petaled corolla.
Photographs taken in the Ozark National Scenic Riverways, Shannon County, MO., 5-19-03.
Jennifer Anderson. United States, IA, Scott Co., Davenport, Nahant Marsh. 2002.
Robert H. Mohlenbrock. USDA SCS. 1989.
Midwest wetland flora: Field office illustrated guide to plant species
. Midwest National Technical Center, Lincoln. Provided by USDA NRCS Wetland Science Institute (WSI).
This plant is listed by the U.S. federal government or a state. Common names are from state and federal lists. Click on a place name to get a complete noxious weed list for that location, or click here for a composite list of all
Federal and State Noxious Weeds
Class B noxious weed
indigobush, lead plant
Noxious weed seed and plant quarantine
U.S. Weed Information
This plant can be weedy or invasive according to the authoritative sources noted below.This plant may be known by one or more common names in different places, and some are listed above. Click on an acronym to view each weed list, or click here for a composite list of
Weeds of the U.S.
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