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Marcus, Joseph A.
Thalia dealbata Fraser ex Roscoe
Powdery alligator-flag, Powdery thalia, Water canna
Synonym(s): Thalia barbata
USDA Symbol: thde
USDA Native Status: L48 (N)
Powdery alligator-flag is a robust, tropical, aquatic perennial, 3-6 ft. tall. The large, broadly lance-shaped, long-petioled leaves are covered with a white powdery coating as are all parts of the plant. The blue and purple flowers are crowded in an open panicle.
Plant CharacteristicsDuration: Perennial Habit: Herb Flower:
Fruit: Size Class:
Bloom InformationBloom Color: Purple
Bloom Time: May , Jun , Jul , Aug , Sep , Oct
, TX Native Distribution:
Locally on Coastal Plain from SC
& n. into OK,
extreme s.e. MO
& s. IL Native Habitat:
Cypress swamps; marshes; ponds
Growing ConditionsWater Use:
High Light Requirement:
Part Shade Soil Moisture:
Shallow water or poorly drained, wet soils. Mud, Saline tolerant Conditions Comments:
A dramatic, tropical looking plant with broad grey-green leaves. Small purple flowers bloom on tall flower
stalks above the leaves. Good for wetland gardens and habitats. May be propagated easily by divisions. Larval food plant for the Brazilian Skipper butterfly.
BenefitUse Ornamental: Water garden, Bog or pond area
Conspicuous Flowers: yes
Interesting Foliage: yes
Deer Resistant: Minimal
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.
Record Last Modified: 2013-09-12
Research By: LAL