Weed Information: Soliva sessilis
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Soliva sessilis

Common Names: lawnweed, field burrweed, lawn burrweed, common soliva, onehunga weed

Description

This low growing annual weed has composite heads of tiny flowers in the leaf axils. The bracts subtending these heads are spine tipped and at maturity form a bur.

Characteristics

Flower Color
  • Yellow-green
  • Green
Inflorescence Type (How the flowers are arranged on the plant)
  • Axillary cluster
  • Head
  • Solitary, axillary
Number of Petals
  • 0 (no petals)
  • 5 petals
Petal Separation
  • United > 75% of length
Petal Tip
  • Pointed
Flower Symmetry
  • Flowers regular
Flower Length (Head length in the Asteraceae)
  • 2 mm (.08 inch)
  • 3 mm (.12 inch)
  • 4 mm (.16 inch)
  • 5 mm (.20 inch)
  • 6 mm (.24 inch)
  • 7 mm (.28 inch)
Flower Width (Head width in the Asteraceae)
  • 3 mm (.12 inch)
  • 4 mm (.16 inch)
  • 5 mm (.20 inch)
  • 6 mm (.24 inch)
  • 7 mm (.28 inch)
  • 8 mm (.32 inch)
Number of Sepals
  • sepals lacking
  • more than 10 sepals
Sepal Separation
  • Completely free to base
Sepal Tip
  • Spine-like
Flower Sex
  • Bisexual (perfect)
Number of Styles
  • 1 style
Number of Stamens
  • 5 stamens
Stamens Attached to the Petals
  • Stamens attached to the petals
Stamens Connate (united)
  • Anthers united, syngynoecious

Carpel Separation
  • Carpels united (or one)
Number of Carpels
  • 1 carpel
Ovary Position
  • Inferior (epigynous)
Fruit Type
  • Achene
Fruit Length at Maturity
  • 1 mm (.04 inch) or less
  • 2 mm (.08 inch)
  • 3 mm (.12 inch)
  • 4 mm (.16 inch)
  • 5 mm (.20 inch)
  • 6 mm (.24 inch)
  • 7 mm (.28 inch)
  • 8 mm (.32 inch)
Fruit Width at Maturity
  • 1 mm (.04 inch) or less
  • 2 mm (.08 inch)
  • 3 mm (.12 inch)
  • 4 mm (.16 inch)
  • 5 mm (.20 inch)
  • 6 mm (.24 inch)
  • 7 mm (.28 inch)
  • 8 mm (.32 inch)
Burs
  • Fruit or seed bur-like

Leaf Arrangement
  • Opposite
Leaf Type
  • Pinnately dissected
Stipules
  • Lacking
Tendrils
  • Tendrils absent
Venation
  • Pinnate
Petiole (leaf stem) Blade Ratio
  • Petiole < 25% total length
  • Petiole 25% - 75% total length
Leaf Length (blade PLUS petiole)
  • 1 - 2 cm (.40 - .80 inch)
  • 2 - 4 cm (.80 - 1.60 inches)
Leaf Width
  • 5 - 10 mm (.20 - .40 inch)
  • 1 - 2 cm (.40 - .80 inch)
Leaf or Leaflet Margin
  • Lobed
  • Parted
  • Ciliate
Leaf or Leaflet Blade Base
  • Truncate
Leaf or Leaflet Tip
  • Acute
Leaf or Leaflet Blade Surface
  • Hirsute
  • Pubescent
Succulence
  • Not succulent

Milky Juice
  • Juice NOT milky (watery)
Woodiness
  • Herbaceous
Spines or Thorns
  • Spines or Thorns ABSENT
  • Spines on flowers or fruits only
Aromatic (vegetative structures)
  • Not aromatic
Life Cycle
  • Annual
Growth Habit (while flowering)
  • Spreading ascending
  • Erect, spherical (bushy)
Plant Height at Maturity
  • 1 - 5 cm (.40 - 2.0 inches)
  • 5 - 10 cm (2.0 - 4.0 inches)
  • 1 - 2 dm (4.0 - 8.0 inches)
Wind Dissemination
  • Not wind disseminated
Moisture Regime
  • Mesic
Chlorophyll
  • Present

Stem Cross Section
  • Round
Flowering Stem Leaves
  • Stem uniformly leafy
Main Stem Branches
  • Main stem branched

Root or Vegetative Propagule
  • Fibrous

US State
  • Alabama
  • Arkansas
  • Florida
  • Georgia
  • Louisiana
  • Mississippi
  • North Carolina
  • South Carolina
  • Tennessee
  • Texas
  • Virginia
  • Hawaii
  • Arizona
  • California
  • Oklahoma
  • Oregon
  • Washington
Canadian Province or Territory
  • British Columbia

  • Garden Weeds of Southern California, 1981, See page: 103
  • S.W.S.S. Weed ID Guide, 1993 Section Number and Five letter code: 13 SOVPT
  • Weeds of Arkansas 1981 (MP 169-5M-3-81) See page: 19
  • Weeds of California, 1970, State of California Publications and Documents. See page: 498
  • Weeds of California and other Western States, 2007 (ISBN 13: 978-1-879906-69-3) See Page: 395
  • Weeds of Southern Turfgrasses, 1992 Univ. of Florida, Gainesville Publication # SP-79, See page: 108
  • Weeds of the South, University of Georgia 2009, ISBN#0-8203-3046-9 See page: 103
  • Listed as a `Weed` by the Biota of North America Program, 2008 x
  • Listed in the WSSA Composite List of Weeds X
  • Sonchus arvensis ssp. arvensis / Asteraceae / sowthistle, perennial
  • The Biology of Canadian Weeds: Canadian Journal of Plant Science Vol:70Pg.509
  • Common Weeds of Canada, Mulligan 1987 (ISBN 0-910053-59-9) See page: 130
  • Common Weeds of the Canadian Prairies, 1963 (Cat# A53-1136-1) See page: 62
  • Common Weeds of the United States, 1971 (ISBN 0-486-20504-5) See page: 432
  • Fifty Important Weeds of Montana, Montana Ag. Ext. Service, 1920. 126 pages. See page: 94
  • Gilkey`s Weeds of the Pacific Northwest, 1980 (ISBN 0-88246-039-0) See page: 295
  • How to Know the Weeds, 1972, (ISBN# 0-697-04880-2) See page: 160
  • Identification Guide to the Weeds of Quebec, 1999 (ISBN# 2-89457-174-7) See page: 54
  • Manual of Ohio Weeds, 1931 Ohio Ag. Exp. Station Bull. # 475, See page: 110
  • Nebraska Weeds, 1979 Nebraska Dept. of Ag., Lincoln NE, See page: 243
  • Northwest Weeds, 1990 (ISBN 0-87842-249-8) See page: 159
  • Ontario Weeds, 1992 Agdex 640, Publication #505 See page: 247
  • Some Important Michigan Weeds, 1951 Mich. Ag. Exp. Station Bulletin #304, See page: 201
  • South Dakota Weeds, 1967 South Dakota State University, See page: 15
  • South Dakota Weeds 2002 South Dakota Dept. of Ag. 523 E. Capitol, Foss Bldg. Pierre, South Dakota 57501 See page: 22/23
  • S.W.S.S. Weed ID Guide, 1993 Section Number and Five letter code: 13 SONAR
  • Weed Seeds of the Great Plains, 1993 University of Kansas# 92-125-B ISBN# 0-7006-0651-3 See index #: 243
  • Weeds, 1955 (1980) Walter Conrad Muenscher, ISBN# 0-8014-1266-8 See page: 496, 497
  • Weeds, A Golden Guide, 1972 ISBN#0-307-24353-2 See page: 155
  • Weeds, 1957 Illinois State Dept. of Ag., See page: 20
  • Weeds and Poisonous Plants of Wyoming and Utah 1987 (ISBN 0-941570-06-1) See page: 210
  • Weeds of Alberta, 1983 Alberta Environmental Centre Agdex 640-4, See page: 191
  • Weeds of California, 1970, State of California Publications and Documents. See page: 499, 500
  • Weeds of California and other Western States, 2007 (ISBN 13: 978-1-879906-69-3) See Page: 402
  • Weeds of Canada, 1970 Canada Dept. of Ag., Pub. # 948, See page: 201
  • Weeds of Colorado, 1990 Cooperative Extension, Colorado State Univ. Bulletin 521A, See page: 185
  • Weeds of Eastern Washington and Adjacent Areas, 1972 (LOC 72-83635) See page: 322
  • Weeds of Nova Scotia, 1986 (ISBN# 0-88871-063) See page: 80
  • Weeds of the Midwestern United States & Central Canada, University of Georgia 2010, ISBN#0-8203-3506-1 See page: 123
  • Weeds of the North Central States, 1981 Univ. of Illinois, Urbana - Champaign Bulletin # 772, See page: 234
  • Weeds of the Northeast, 1956, Univ. of Delaware Field Manual #1 See species #: 258
  • Weeds of the Northeast, 1997 Cornell University ISBN# 0-8014-8334-4 See page: 150, 158
  • Weeds of the Northern United States and Canada, 1964 Montgomery See page: 201
  • Weeds of the Northern U.S, and Canada, 1999 Royer and Dickinson, (ISBN# 1-55105-221-0) See page: 54, 55
  • Weeds of the South, University of Georgia 2009, ISBN#0-8203-3046-9 See page: 104
  • Weeds of the West, 1992 (ISBN 0941570-13-4) See page: 176
  • Weeds of the West, 2000 (ISBN 0941570-13-4) See page: 176
  • Weeds of Utah, 1971 UAES Special Report 21, See page: 106
  • Listed as a `Weed` by the Biota of North America Program, 2008 x
  • Listed in the WSSA Composite List of Weeds X
  • Sonchus arvensis ssp. uliginosus / Asteraceae / sowthistle, marsh
  • Identification Guide to the Weeds of Quebec, 1999 (ISBN# 2-89457-174-7) See page: 55
  • Ontario Weeds, 1992 Agdex 640, Publication #505 See page: 247
  • Weeds, 1955 (1980) Walter Conrad Muenscher, ISBN# 0-8014-1266-8 See page: 498
  • Weeds of the Northern United States and Canada, 1964 Montgomery See page: 201
  • Weeds of the Northern U.S, and Canada, 1999 Royer and Dickinson, (ISBN# 1-55105-221-0) See page: 55
  • Weeds of the West, 1992 (ISBN 0941570-13-4) See page: 178
  • Weeds of the West, 2000 (ISBN 0941570-13-4) See page: 178
  • Listed as a `Weed` by the Biota of North America Program, 2008 x
  • Listed in the WSSA Composite List of Weeds X
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