Spermatophytes (seed plants): Angiosperms (flowering plants): Eudicots: Core Eudicots: Rosids: Fabids: Rosales
WEAKLEY'S FLORA OF THE SOUTHEASTERN US (4/14/23):
Humulus scandens
FAMILY
Cannabaceae
Go to FSUS key
Dig deeper at SERNEC, a consortium of southeastern herbaria.
Check out EDDMapS.org to see where this has been reported.
Read more about Japanese Hops at Vascular Plants of North Carolina.
SYNONYMOUS WITH
PLANTS NATIONAL DATABASE:
Humulus japonicus
FAMILY
Cannabaceae
SYNONYMOUS WITH Floristic Synthesis of North America. BONAP (Kartesz, 2021)
Humulus japonicus
SYNONYMOUS WITH Flora of China
Humulus scandens
SYNONYMOUS WITH A revision of native North American Humulus (Cannabaceae) (Tembrock, McAleer, & Gilligan, 2016)
Humulus scandens
SYNONYMOUS WITH Floristic Synthesis of North America (Kartesz, 1999)
Humulus japonicus
SYNONYMOUS WITH Flora of North America north of Mexico, vol. 3 (1997)
Humulus japonicus
SYNONYMOUS WITH VASCULAR FLORA OF THE CAROLINAS (Radford, Ahles, & Bell, 1968) 058-01-002:
Humulus japonicus FAMILY Cannabaceae
COMMON NAME:
Japanese Hops
To see larger pictures, click or hover over the thumbnails.
)
JK Marlow jkm170320_139
March Laurens County SC
Charlie Lollis Memorial Park
)
JK Marlow jkm170322_184
March Greenville County SC
Lake Conestee Nature Park
)
JK Marlow jkm170322_188
March Greenville County SC
Lake Conestee Nature Park
)
JK Marlow jkm100513_025
May Greenville County SC
Lake Conestee Nature Park
Most leaves 5-9 lobed, per Weakley's Flora.
)
JK Marlow jkm100513_027
May Greenville County SC
Lake Conestee Nature Park
Leaves are rough to the touch & occur on long petioles up to 8" in length, per Invasive Exotic Plants of North Carolina (Smith, 2008).
COMPARE
palmately veined leaves of vines
)
JK Marlow jkm100513_028
May Greenville County SC
Lake Conestee Nature Park
)
JK Marlow jkm100513_031
May Greenville County SC
Lake Conestee Nature Park
Stems are covered with downward pointing prickles, per Invasive Exotic Plants of North Carolina (Smith, 2008).
)
JK Marlow jkm140625_385
June Greenville County SC
Cleveland Park
)
JK Marlow jkm140625_397
June Greenville County SC
Cleveland Park
)
JK Marlow jkm110717_161
July Greenville County SC
Lake Conestee Nature Park
This plant has become a serious weed along major rivers in Virginia, per Invasive Exotic Plants of North Carolina (Smith, 2008).
)
JK Marlow jkm140809_403
August Greenville County SC
Swamp Rabbit Trail
Male flowers bloom along upright flower stems 6-10" long, per Invasive Plants, Guide to Identification, Impacts and Control (Kaufman & Kaufman, 2007).
)
JK Marlow jkm140809_411
August Greenville County SC
Swamp Rabbit Trail
)
JK Marlow jkm140823_096
August Greenville County SC
Swamp Rabbit Trail
Staminate inflorescences axillary and terminal, erect, cymose panicles, per Flora of North America.
)
JK Marlow jkm140823_096b
August Greenville County SC
Swamp Rabbit Trail
Five sepals, petals absent, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
)
JK Marlow jkm161028_040
October Greenville County SC
Lake Conestee Nature Park
)
JK Marlow jkm161028_982
October Greenville County SC
Lake Conestee Nature Park
WEAKLEY'S FLORA OF THE SOUTHEASTERN US (4/14/23):
Humulus scandens
FAMILY
Cannabaceae
SYNONYMOUS WITH
PLANTS NATIONAL DATABASE:
Humulus japonicus
FAMILY
Cannabaceae
SYNONYMOUS WITH
Floristic Synthesis of North America. BONAP (Kartesz, 2021)
Humulus japonicus
SYNONYMOUS WITH
Flora of China
Humulus scandens
SYNONYMOUS WITH
A revision of native North American Humulus (Cannabaceae) (Tembrock, McAleer, & Gilligan, 2016)
Humulus scandens
SYNONYMOUS WITH
Floristic Synthesis of North America (Kartesz, 1999)
Humulus japonicus
SYNONYMOUS WITH
Flora of North America north of Mexico, vol. 3
Humulus japonicus
SYNONYMOUS WITH
VASCULAR FLORA OF THE CAROLINAS (Radford, Ahles, & Bell, 1968) 058-01-002:
Humulus japonicus
FAMILY
Cannabaceae
3495
Herbaceous vine
Annual
Dioecious
Habitat: Disturbed areas, particularly in rich, alluvial soils, where it has become a serious weed along some rivers in our region, per Weakley's Flora
Non-native: Japan, Taiwan, & China
Common in NC Piedmont (rare elsewhere in GA-NC-SC)
CLICK HERE to see a map, notes, and images from Weakley's Flora of the Southeastern US.
This plant is causing problems in natural areas outside its native range, according to authorities such as:
- Kentucky Exotic Pest Plant Council, 2013
- Mid-Atlantic Exotic Pest Plant Council
- SC Exotic Pest Plant Council, 2014
- Virginia Department of Conservation and Recreation, 2014
IS THE PLANT "ARMED"?
Veins on lower surface of leaves armed with rigid, spinulose hairs
LEAVES:
Simple - palmately lobed
Opposite
Stipules are persistent.
FLOWER:
Summer/Fall
Greenish
Radially symmetrical
5 sepals
Petals absent
Superior ovary
Unisexual
FRUIT:
Summer/Fall
Nutlet
TO LEARN MORE about this plant, look it up in a good book!
- Invasive Plants, Guide to Identification, Impacts and Control (Kaufman & Kaufman, 2007) p233
- Invasive Exotic Plants of North Carolina (Smith, 2008) p138
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".