Native & Naturalized Plants of the Carolinas & Georgia


476

Herbaceous vine
Perennial
Dioecious

Native to the Carolinas & Georgia

Documented growing wild in GA NC SC

Uncommon

Look for it in moist forests and woodlands, per Weakley's Flora

map
To see a detailed map, click here

 

partial shade shade ...Moist ...Variable

LEAVES:
Simple
Alternate (rarely the lowermost with short internodes, appearing nearly whorled)

FLOWER:
Spring/Summer
Greenish-yellow
Unisexual
6 tepals
6 stamens
Inferior ovary

FRUIT:
Summer/Fall
Capsule

 

TO LEARN MORE about this plant, look it up in a good book!



Spermatophytes (seed plants): Angiosperms (flowering plants): Monocots: Dioscoreales

WEAKLEY'S FLORA (3/8/10):
Dioscorea villosa   FAMILY Dioscoreaceae

LESS THAN PLANTS NATIONAL DATABASE:
Dioscorea villosa   FAMILY Dioscoreaceae

GREATER THAN & LESS THAN VASCULAR FLORA OF THE CAROLINAS (1968) 043-01-002ab?:
Dioscorea villosa var. villosa   FAMILY Dioscoreaceae

GREATER THAN Vascular Flora of the Carolinas
Dioscorea villosa var. hirticaulis

GREATER THAN Manual of the Southeastern Flora (Small, 1933)
Dioscorea hirticaulis

 

COMMON NAME:
Common Wild Yam, Streamhead Yam


Click or hover over the thumbnails to see larger pictures.

image of Dioscorea villosa, Common Wild Yam, Streamhead Yam

USDA-NRCS PLANTS Database / Britton, N.L., and A. Brown. 1913    pnd_divi4_001_lvd

        

image of Dioscorea villosa, Common Wild Yam, Streamhead Yam

Patrick D. McMillan    pdmdvillosa_trsp1

June    Pickens County    SC

Table Rock State Park

Male inflorescence widely branched with 1-4 tiny white flowers per node, per Wildflowers of Tennessee.

image of Dioscorea villosa, Common Wild Yam, Streamhead Yam

Patrick D. McMillan    pdmdvillosa_trsp2

June    Pickens County    SC

Table Rock State Park

All leaves alternate (rarely the lowermost appearing nearly whorled), per Weakley's Flora.

image of Dioscorea villosa, Common Wild Yam, Streamhead Yam

Patrick D. McMillan    pdmdvillosa_trsp3

June    Pickens County    SC

Table Rock State Park

Leaves glabrous to densely pubescent beneath, per Vascular Flora of the Carolinas.

image of Dioscorea villosa, Common Wild Yam, Streamhead Yam

Patrick D. McMillan    pdmdvillosa_trsp4

June    Pickens County    SC

Table Rock State Park

Staminate spikes have up to 4 flowers per node, per Wildflowers of Tennessee, the Ohio Valley, and the Southern Appalachians.

image of Dioscorea villosa, Common Wild Yam, Streamhead Yam

Patrick D. McMillan    pdmdvillosa_wadc1

June?    Pickens County    SC

Jocassee Gorges

image of Dioscorea villosa, Common Wild Yam, Streamhead Yam

JK Marlow    jkm140704_566

July    Jackson County    NC

Whiteside Mountain

Female (pistillate) spikes have 1 flower per node, per Wildflowers of Tennessee, the Ohio Valley, and the Southern Appalachians.

image of Dioscorea villosa, Common Wild Yam, Streamhead Yam

JK Marlow    jkm140704_571

July    Jackson County    NC

Whiteside Mountain

image of Dioscorea villosa, Common Wild Yam, Streamhead Yam

Tim Spira    tps_dvillosa2

July        

Leaf with wide sinuses, 7-11 parallel veins, many cross veins; base cordate, per Vascular Flora of the Carolinas.

image of Dioscorea villosa, Common Wild Yam, Streamhead Yam

Patrick D. McMillan    pdmdvillosa_wsm1

August?    Jackson County    NC

Whiteside Mountain

Our native Dioscorea have 7-13 main veins, vs. Smilax section Nemexia w 3(5), per Weakley's Flora.

image of Dioscorea villosa, Common Wild Yam, Streamhead Yam

JK Marlow    s071011_ab

October    Oconee County    SC

Oconee Station/Station Cove

Stem polygonal in cross-section, with 8-14 narrowly winged ribs, per Weakley's Flora.

image of Dioscorea villosa, Common Wild Yam, Streamhead Yam

JK Marlow    s071011_ab2

October    Oconee County    SC

Oconee Station/Station Cove

Fruits about 1" long with 3 broad wings, occuring in clusters, per Wildflowers of Tennessee.