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Helianthus exilis
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Serpentine Sunflower
( Helianthus exilis )
Helianthus exilis
More Photos at CalPhotos
More Info at Jepson eFlora
Calflora
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1 Nurseries Carry This Plant
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About Serpentine Sunflower (Helianthus exilis)
1 Nurseries Carry This Plant
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Helianthus exilis
is a species of sunflower known by the common name serpentine sunflower. It is native to northern California (from Siskiyou County south to Napa County and Nevada County), where it grows mainly in mountainous areas, often in serpentine soils.
Helianthus exilis
is an erect annual reaching heights over a meter (40 inches)). It has a hairy, rough stem with leaves lance- or oval-shaped, usually pointed, sometimes serrated along the edges, and 3 to 15 centimeters (1. 2-6. 0 inches) long. The inflorescence holds one or more flower heads, and each plant may have many inflorescences growing along the full length of the stem. The flower head has a cup of long, pointed phyllaries holding an array of bright yellow ray florets each one to two centimeters (0. 4-0. 8 inches) long around a center of yellow to dark purple or reddish disc florets. The achene is 3 to 5 millimeters (0. 12-0. 20 inches) long.
Plant Description
Plant Type
Annual Herb
Size
3.3 ft tall
Flower Color
Yellow
Wildlife Supported
Butterflies & moths hosted ( 15
likely
* )
SHOW ALL
*
Painted Lady
Vanessa cardui
Vanessa cardui
*
Alfalfa Looper Moth
Autographa californica
Autographa californica
*
Armyworm Moth
Mythimna unipuncta
Mythimna unipuncta
*
Isabella Tiger Moth
Pyrrharctia isabella
Pyrrharctia isabella
*
Bilobed Looper Moth
Megalographa biloba
Megalographa biloba
*
Ipsilon Dart
Agrotis ipsilon
Agrotis ipsilon
*
Corn Earworm Moth
Helicoverpa zea
Helicoverpa zea
Landscaping Information
Sun
Full Sun
Nurseries
Carried by 1
Common uses
Bird Gardens, Bee Gardens
Natural Setting
Site Type
Moist places,
Climate
Annual Precipitation: 24.9" - 79.4", Summer Precipitation: 0.40" - 1.92", Coldest Month: 31.9" - 47.5", Hottest Month: 60.5" - 73.0", Humidity: 0.38" - 23.36", Elevation: 751" - 5016"
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Serpentine Sunflower
Helianthus exilis
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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