Spermatophytes (seed plants): Angiosperms (flowering plants): Eudicots: Core Eudicots: Rosids: Fabids: Malpighiales
WEAKLEY'S FLORA OF THE SOUTHEASTERN US (4/24/22):
Podostemum ceratophyllum
FAMILY
Podostemaceae
Go to FSUS key
Dig deeper at SERNEC, a consortium of southeastern herbaria.
Read more about Riverweed at Vascular Plants of North Carolina.
SYNONYMOUS WITH
PLANTS NATIONAL DATABASE:
Podostemum ceratophyllum
FAMILY
Podostemaceae
SYNONYMOUS WITH Floristic Synthesis of North America. BONAP (Kartesz, 2021)
Podostemum ceratophyllum
SYNONYMOUS WITH Flora of North America
Podostemum ceratophyllum
SYNONYMOUS WITH VASCULAR FLORA OF THE CAROLINAS (Radford, Ahles, & Bell, 1968) 090-01-001:
Podostemum ceratophyllum FAMILY Podostemaceae
INCLUDING Manual of the Southeastern Flora (Small, 1933, 1938)
Podostemon abrotanoides
INCLUDING & ORTHOGRAPHIC VARIANT Manual of the Southeastern Flora (Small, 1933, 1938)
Podostemon ceratophyllum
COMMON NAME:
Riverweed, Threadfoot, Riffleweed
To see larger pictures, click or hover over the thumbnails.
)
JK Marlow jkm180408_1131
April McCormick County SC
Parks Mill
A highly unusual, alga-like aquatic vascular plant w narrow dissected leaves, per Wildflowers & Plant Communities of the Southern Appalachian Mountains and Piedmont (Spira, 2011).
)
JK Marlow jkm160628_126
June Polk County NC
Pearson's Falls
Small disk-like holdfasts anchor it to rocks & ledges of fast-moving streams, per Wildflowers & Plant Communities of the Southern Appalachian Mountains and Piedmont (Spira, 2011).
)
COMPARE
WEAKLEY'S FLORA OF THE SOUTHEASTERN US (4/24/22):
Podostemum ceratophyllum
FAMILY
Podostemaceae
SYNONYMOUS WITH
PLANTS NATIONAL DATABASE:
Podostemum ceratophyllum
FAMILY
Podostemaceae
SYNONYMOUS WITH
Floristic Synthesis of North America. BONAP (Kartesz, 2021)
Podostemum ceratophyllum
SYNONYMOUS WITH
Flora of North America
Podostemum ceratophyllum
SYNONYMOUS WITH
VASCULAR FLORA OF THE CAROLINAS (Radford, Ahles, & Bell, 1968) 090-01-001:
Podostemum ceratophyllum
FAMILY
Podostemaceae
INCLUDING
Manual of the Southeastern Flora (Small, 1933, 1938)
Podostemon abrotanoides
INCLUDING & ORTHOGRAPHIC VARIANT
Manual of the Southeastern Flora (Small, 1933, 1938)
Podostemon ceratophyllum
1972
Submersed aquatic (rooted); Forb
Perennial
Habitat: Attached to rocks and dams in rapidly or slowly flowing water, per Weakley's Flora
Native to the Carolinas & Georgia
Common (rare in Coastal Plain)
CLICK HERE to see a map, notes, and images from Weakley's Flora of the Southeastern US.
Click here to see a map showing all occurrences known to SERNEC, a consortium of southeastern herbaria. (Zoom in to see more detail.)
LEAVES:
Simple: dissected into linear or filiform segments
Alternate
FLOWER:
Spring/Summer
Petals absent
2 stamens & 2 minute staminodia
Bisexual
Flowers in leaf axils
FRUIT:
Spring/Summer
Red
Capsule
TO LEARN MORE about this plant, look it up in a good book!
- Wildflowers & Plant Communities of the Southern Appalachian Mountains and Piedmont (Spira, 2011) p427
If a search such as "Carex leptalea var. leptalea" doesn't deliver the results you want, try "Carex leptalea".
Or, to minimize chances of a misspelling, try just "Carex le".
Less is more: If "pencil flower" doesn't deliver the results you want, try "pencil".
Or try alternate spellings: If "wooly" doesn't work, try "woolly" or just "wool".