Spermatophytes (seed plants): Angiosperms (flowering plants): Eudicots: Core Eudicots: Caryophyllales
WEAKLEY'S FLORA OF THE SOUTHEASTERN US (2/10/25):
Polygonum tenue
FAMILY
Polygonaceae
Go to FSUS key
Dig deeper at SERNEC, a consortium of southeastern herbaria.
SYNONYMOUS WITH
PLANTS NATIONAL DATABASE:
Polygonum tenue
FAMILY
Polygonaceae
SYNONYMOUS WITH Floristic Synthesis of North America. BONAP (Kartesz, 2021)
Polygonum tenue
SYNONYMOUS WITH Flora of North America north of Mexico, vol. 5 (2005)
Polygonum tenue
SYNONYMOUS WITH VASCULAR FLORA OF THE CAROLINAS (Radford, Ahles, & Bell, 1968) 063-04-005:
Polygonum tenue FAMILY Polygonaceae
INCLUDING Britton & Brown Illus Flora of Northeast US & adjacent Canada (Gleason, 1952)
Polygonum tenue var. protrusum
INCLUDING Britton & Brown Illus Flora of Northeast US & adjacent Canada (Gleason, 1952)
Polygonum tenue var. tenue
SYNONYMOUS WITH Manual of the Southeastern Flora (Small, 1933, 1938)
Polygonum tenue
COMMON NAME:
Glade Knotweed, Slender Knotweed
To see larger pictures, click or hover over the thumbnails.
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USDA-NRCS PLANTS Database / Britton, N.L., and A. Brown. 1913 pnd_pote2_001_lvd
WEAKLEY'S FLORA OF THE SOUTHEASTERN US (2/10/25):
Polygonum tenue
FAMILY
Polygonaceae
SYNONYMOUS WITH
PLANTS NATIONAL DATABASE:
Polygonum tenue
FAMILY
Polygonaceae
SYNONYMOUS WITH
Floristic Synthesis of North America. BONAP (Kartesz, 2021)
Polygonum tenue
SYNONYMOUS WITH
Flora of North America north of Mexico, vol. 5
Polygonum tenue
SYNONYMOUS WITH
VASCULAR FLORA OF THE CAROLINAS (Radford, Ahles, & Bell, 1968) 063-04-005:
Polygonum tenue
FAMILY
Polygonaceae
INCLUDING
Britton & Brown Illus Flora of Northeast US & adjacent Canada (Gleason, 1952)
Polygonum tenue var. protrusum
INCLUDING
Britton & Brown Illus Flora of Northeast US & adjacent Canada (Gleason, 1952)
Polygonum tenue var. tenue
SYNONYMOUS WITH
Manual of the Southeastern Flora (Small, 1933, 1938)
Polygonum tenue
4649
Forb
Annual
Habitat: Glades, barrens, and thin, rocky soils, over various rock types (including granite, diabase, amphibolite, greenstone, metagabbro, and shale), also in dry sands, per Weakley's Flora
Native to the Carolinas & Georgia
Uncommon in NC Mountains (rare elsewhere in GA-NC-SC)
CLICK HERE to see a map, notes, and images from Weakley's Flora of the Southeastern US.
LEAVES:
Simple - leaves plicate with one fold on either side of the midrib
Alternate
Leaves sessile or petioles 0-1mm long
FLOWER:
Summer/Fall
Sepals green with broad pinkish or whitish border
5-parted calyx
Petals absent
Superior ovary
Flowers solitary (or rarely paired) in leaf axils
FRUIT:
Summer/Fall
Nutlet
TO LEARN MORE about this plant, look it up in a good book!
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".