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Polygonum hickmanii
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Scotts Valley Polygonum
( Polygonum hickmanii )
Polygonum hickmanii
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More Info at Jepson eFlora
Calflora
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About Scotts Valley Polygonum (Polygonum hickmanii)
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Polygonum hickmanii
is a rare species of flowering plant in the buckwheat family known by the common names Scotts Valley polygonum and Hickman's knotweed. It is endemic to Santa Cruz County, California, where it is known from only two sites in the Scotts Valley. It grows on coastal prairie on mudstone and sandstone substrates, in an area known for its spring wildflowers. The small plant was first noted in 1990 and described as a new species in 1995. The plant is a federally listed endangered species.
Polygonum hickmanii
is a small annual plant forming compact patches on the ground, its stem growing no more than about 5 centimeters (2 inches) tall. It is lined with linear leaves especially near the tips of the branches, and has a cylindrical, shreddy ochrea. Solitary flowers occur in the leaf axils. They are only 2 or 3 millimeters long and white or pink-tinged in color. The eight tiny stamens are tipped with orange-pink anthers.
Plant Description
Plant Type
Annual herb
Size
0.8 - 1.9 in tall
Flower Color
Pink, White, Red
Wildlife Supported
Butterflies & moths hosted ( 13
likely
* )
SHOW ALL
*
Gray Hairstreak
Strymon melinus
Strymon melinus
*
Acmon Blue
Icaricia acmon
Icaricia acmon
*
Purplish Copper
Lycaena helloides
Lycaena helloides
*
White-lined Sphinx
Hyles lineata
Hyles lineata
*
Subterranean Dart
Feltia subterranea
Feltia subterranea
*
Western Yellowstriped Armyworm
Spodoptera praefica
Spodoptera praefica
*
Morning-glory Plume Moth
Emmelina monodactyla
Emmelina monodactyla
Landscaping Information
Natural Setting
Climate
Annual Precipitation: 43.2" - 45.4", Summer Precipitation: 0.43" - 0.45", Coldest Month: 45.6" - 46.4", Hottest Month: 69.6" - 72.3", Humidity: 0.59" - 17.34", Elevation: 627" - 825"
Alternative Names
Common Names
: Hickman's Knotweed
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Scotts Valley Polygonum
Polygonum hickmanii
Sources include:
Wikipedia
. All text shown in the "About" section of these pages is available under the
Creative Commons Attribution-ShareAlike License
. Plant observation data provided by the participants of the
California Consortia of Herbaria
, Sunset information provided by
Jepson Flora Project
. Propogation from seed information provided by the
Santa Barbara Botanical Garden
from "Seed Propagation of Native California Plants" by Dara E. Emery. Sources of plant photos include
CalPhotos
,
Wikimedia Commons
, and independent plant photographers who have agreed to share their images with Calscape. Other general sources of information include
Calflora
,
CNPS Manual of Vegetation Online
,
Jepson Flora Project
,
Las Pilitas
,
Theodore Payne
,
Tree of Life
,
The Xerces Society
, and information provided by CNPS volunteer editors, with special thanks to Don Rideout. Climate data used in creation of plant range maps is from
PRISM Climate Group, Oregon State University
, using 30 year (1981-2010) annual "normals" at an 800 meter spatial resolution.
Links:
Jepson eFlora Taxon Page
CalPhotos
Wikipedia
Calflora
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