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Pterocaulon pycnostachyum (Blackroot)
Tauscher, Joseph Allan

Pterocaulon pycnostachyum

Pterocaulon pycnostachyum (Michx.) Elliott

Blackroot, Densespike Blackroot, Fox-tail, Coastal Blackroot

Asteraceae (Aster Family)

Synonym(s): Pterocaulon undulatum

USDA Symbol: PTPY2

USDA Native Status: L48 (N)


From the Image Gallery

2 photo(s) available in the Image Gallery

Plant Characteristics

Duration: Perennial
Habit: Herb , Subshrub
Root Type: Tuberous
Leaf Retention: Deciduous
Leaf Arrangement: Alternate
Leaf Complexity: Simple
Leaf Shape: Lanceolate
Leaf Pubescence: Tomentose
Leaf Margin: Dentate , Denticulate
Inflorescence: Terminal
Size Notes: Up to about 32 inches tall.
Leaf: Green above, white below.
Fruit: Fruit is a cypsela (pl. cypselae). Though technically incorrect, the fruit is often referred to as an achene.

Bloom Information

Bloom Color: White
Bloom Time: Apr , May , Jun , Jul , Aug , Sep
Bloom Notes: Buds pinkish-white, maturing to white, then to greenish-white.


USA: AL , FL , GA , MS , NC , SC

Growing Conditions

Water Use: Low , Medium
Light Requirement: Sun , Part Shade
Soil Moisture: Dry , Moist
Soil pH: Acidic (pH<6.8)
Drought Tolerance: High
Heat Tolerant: yes
Soil Description: Sandy, low fertility soils.

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.

Web Reference

Webref 38 - Flora of North America (2019) Missouri Botanical Garden, St. Louis, MO & Harvard University Herbaria, Cambridge, MA.

Additional resources

USDA: Find Pterocaulon pycnostachyum in USDA Plants
FNA: Find Pterocaulon pycnostachyum in the Flora of North America (if available)
Google: Search Google for Pterocaulon pycnostachyum


Record Modified: 2023-01-13
Research By: Joseph A. Marcus

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