''Polygonum douglasii'' is a species of flowering plant in the
knotweed family known by the common name Douglas's knotweed. It is native to much of northern and western North America, where it can be found in many types of habitat, including disturbed areas. It has been found in Canada from
British Columbia
British Columbia (commonly abbreviated as BC) is the westernmost province of Canada, situated between the Pacific Ocean and the Rocky Mountains. It has a diverse geography, with rugged landscapes that include rocky coastlines, sandy beaches, ...
north to
Yukon
Yukon (; ; formerly called Yukon Territory and also referred to as the Yukon) is the smallest and westernmost of Canada's three territories. It also is the second-least populated province or territory in Canada, with a population of 43,964 as ...
and east as far as
Québec
Quebec ( ; )According to the Government of Canada, Canadian government, ''Québec'' (with the acute accent) is the official name in Canadian French and ''Quebec'' (without the accent) is the province's official name in Canadian English is ...
, and in the United States as far south as
California
California is a U.S. state, state in the Western United States, located along the West Coast of the United States, Pacific Coast. With nearly 39.2million residents across a total area of approximately , it is the List of states and territori ...
,
New Mexico
)
, population_demonym = New Mexican ( es, Neomexicano, Neomejicano, Nuevo Mexicano)
, seat = Santa Fe
, LargestCity = Albuquerque
, LargestMetro = Tiguex
, OfficialLang = None
, Languages = English, Spanish ( New Mexican), Navajo, Ker ...
,
Iowa
Iowa () is a state in the Midwestern region of the United States, bordered by the Mississippi River to the east and the Missouri River and Big Sioux River to the west. It is bordered by six states: Wisconsin to the northeast, Illinois to the ...
, and
New York
New York most commonly refers to:
* New York City, the most populous city in the United States, located in the state of New York
* New York (state), a state in the northeastern United States
New York may also refer to:
Film and television
* '' ...
.
''Polygonum douglasii'' is known as a
species complex
In biology, a species complex is a group of closely related organisms that are so similar in appearance and other features that the boundaries between them are often unclear. The taxa in the complex may be able to hybridize readily with each oth ...
, as there are many subspecies that may be better treated as species in their own right.
[Greene, Edward Lee. 1885. Bulletin of the California Academy of Sciences 1(3): 125–126]
/ref>
''Polygonum douglasii'' is variable in morphology
Morphology, from the Greek and meaning "study of shape", may refer to:
Disciplines
*Morphology (archaeology), study of the shapes or forms of artifacts
*Morphology (astronomy), study of the shape of astronomical objects such as nebulae, galaxies, ...
and the subspecies are often difficult to distinguish. In general, plants in this complex are annual herbs growing erect to maximum heights anywhere between 3 and 80 centimeters (1.2–32 inches) with thin, angular stems. High-elevation plants are smaller and sometimes trailing on the surface of the ground. The leaves are linear or widely lance-shaped, sometimes falling away to leave the plant mostly naked in flowering, or reduced to tiny scales at the stem tips. The flowers are a few millimeters long, pink to white, sometimes remaining closed or opening together in a cluster.Flora of North America, ''Polygonum douglasii'' Greene, 1885. Douglas's knotweed, renouée de Douglas
/ref>[The Plant List, ''Polygonum douglasii'' Greene ]
/ref>
References
External links
Jepson Manual TreatmentCalphotos Photo gallery, University of Californiaphoto of herbarium specimen at Missouri Botanical Garden, collected in Idaho in 2009
douglasii
Flora of Canada
Flora of the United States
Flora of California
Plants described in 1880
Taxa named by Edward Lee Greene
Flora without expected TNC conservation status
{{Polygonaceae-stub