Missouri Department of Conservation
Missouri Department of Conservation

Taxonomy

Common Name: SMALL-FLOWERED THOROUGHWORT

Phylum: MAGNOLIOPHYTA

Class: MAGNOLIOPSIDA

Order: ASTERALES

Family: ASTERACEAE

Genus: EUPATORIUM

Species: SEMISERRATUM

Taxonomic Authority: DC.

Taxonomy References: 001 , 003

Status

STATE RANK S1S2
GLOBAL RANK G5

Status References: 005

Habitat Summary

"Primarily associated with swamps, low meadows and fields, wet prairies, and open woods *01*. Also found in disturbed roadside areas *03*."

Primary Habitat: "Wetland - wet prairie/meadow"

References: 001 , 003

Distribution

General Occurrence in State:

"Known only to occur in southeastern Missouri in the Ozark and Mississippi lowlands divisions of the state and from St. Louis county. A historical record exists for Dunklin county (1910) *03*"

County Occurance

County Occurence
Known Likely Unknown Not Likely Historic Extirpated
BUTLER DUNKLIN
CARTER
RIPLEY
SCOTT
ST. LOUIS
STODDARD

References for distribution: 004 , 001 , 003

Distribution by Watersheds

St. John's Ditch and Blue Ditch
St. Francis R. from Wappapello Dam to Arkansas Border
Black R.
Current R.

Comments: ""

Distribution by Ecoregions

Comments: ""

Distribution by Potential Natural Vegetation

Oak-Hickory-Pine Forest
Southern Floodplain Forest

Distribution by Natural Divisions of Missouri

Ozark: Lower Ozark
Mississippi Lowlands: Lowlands

Habitat Associations

Species is associated with "Terrestrial/Aquatic" habitats.

National Wetlands Inventory Association:

Palustrine

Aquatic Associations:

"Palustrine", "Emergent",
"Palustrine", "Emergent",

References for Aquatic Associations: 001 , 003

Habitat Types:

Swamp

References for Habitat Types: 001 , 003

Terrestrial Natural Communities:

Prairie
Wet Prairie
Swamps
Swamp

References for Terrestrial Natural Communities: 001 , 003

Food Habits

Trophic Level:

""

Larval Food Habits

Comments for larval food habits:
""

References for larval food habits:

Juvenile Food Habits

Comments for Juvenile Food Habits:
""

References Juvenile Food Habits

Adult Food Habits

Comments for Adult Food Habits:
""

References Adult Food Habits

Niche Requirements

Egg Niche Requirements

References for egg niches requirements:

Feeding Larvae Niche Requirements

References for feeding larvae niche requirements:

Resting Larvae Niche Requirements

References for resting Larvae niche requirements:

Feeding Juvenile Niche Requirements

References for feeding juvenile niche requirements:

Resting Juvenile Niche Requirements

References for resting juvenile niche requirements:

Breeding Adult Niche Requirements

References for feeding Adult niche requirements:

Feeding Adult Niche Requirements

References for feeding adult niche requirements:

Resting Adult Niche Requirements

References for resting adult niche requirements:

Niche Requirement Summary

General habitat association specified in comments(00270)

Comments about Life History:

Code Comment

Life History Information

Duration of plant:perennial
Life form:herb
Flowering period begins: August
Flowering period ends: September
Origin in state: native

Comments about Life History:

Code Comment

References for life history: 006 , 001

Management

Beneficial Management Practices:

Water - protect natural hydrology to avoid lowering of the water table

Beneficial Management References: 002

Adverse Managment Practices:

Adverse Management References:

Comments on Management:
Beneficial to maintain hydrologic conditions for persistence of saturated soil habitat *02*.

References for Management Comments: 002

References

Reference Code Citation
001 Steyermark, J.A. 1963. The Flora Of Missouri. The Iowa State University Press. Ames, IA. 1728 pp.
002 Unpb Smith, T. Missouri Dept.Of Conservation. P.O. Box 180, Jefferson City, Missouri 65102. 573-751-4115.
003 Unpb Flora Of Missouri Database. G. Yatskievych, Missouri Botanical Garden, P.O. Box 299, St. Louis, Mo. 63166-0299. 314-577-9522.
004 Unpb Missouri Department Of Conservation Heritage Database. P.O. Box 180, Jefferson City, Missouri 65102. 573-751-4115.
005 Missouri Natural Heritage Program. 2004. Missouri Species and Communities of Conservation Concern Checklist. Missouri Department Of Conservation. Jefferson City, Missouri. 47 Pp.
006 Usda, Nrcs. 2001 The Plants Database, Version 3.1 (Http://Plants>Usda>Gov). National Plant Data Center, Baton Rouge, La 70874-4490 Usa.