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Tall Blue Lettuce
( Lactuca biennis )
Lactuca biennis
More Photos at CalPhotos
More Info at Jepson eFlora
Calflora
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About Tall Blue Lettuce (Lactuca biennis)
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Lactuca biennis
is a North American species of wild lettuce known by the common names tall blue lettuce and blue wood lettuce. It is widespread across much of the United States and Canada from Alaska and Yukon south as far as California, New Mexico, and Georgia.
Lactuca biennis
is a biennial herb in the dandelion tribe within the daisy family growing from a taproot to heights anywhere from one half to four meters (20 inches to over 13 feet). There are deeply lobed, toothed leaves all along the stem. The top of the stem bears a multibranched inflorescence with many flower heads. Each head is just over a centimeter (0. 4 inches) wide and has many whitish to light blue ray florets but no disc florets. The fruit is a mottled achene about half a centimeter (0. 2 inches) long with a brownish pappus.
Plant Description
Plant Type
Grasses
Flower Color
Brown
Wildlife Supported
Butterflies & moths hosted ( 20
likely
* )
SHOW ALL
*
White-lined Sphinx
Hyles lineata
Hyles lineata
*
Alfalfa Looper Moth
Autographa californica
Autographa californica
*
Carolina Sphinx
Manduca sexta
Manduca sexta
*
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
Landscaping Information
Natural Setting
Climate
Annual Precipitation: 22.4" - 79.0", Summer Precipitation: 0.41" - 2.02", Coldest Month: 30.3" - 46.9", Hottest Month: 57.0" - 71.0", Humidity: 0.34" - 20.42", Elevation: 94" - 6114"
Alternative Names
Common Names
: Blue Wood Lettuce
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Tall Blue Lettuce
Lactuca biennis
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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