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Knautia arvensis

Knautia arvensis (L.) J.M. Coult.

Scabiosa arvensis L.

Field Scabious, Blue Buttons

KingdomPlantaePlants, but not fungi, lichens, or algae
SubkingdomTracheobiontaVascular plants—plants with a “circulatory system” for delivering water and nutrients
DivisionMagnoliophytaFlowering plants, also known as angiosperms
ClassMagnoliopsidaDicotyledons—plants with two initial seed leaves
SubclassAsteridaeA large class that encompasses asters
OrderDipsacalesIncludes viburnum, honeysuckle, snowberry, beautybush, twinflower, many others
FamilyDipsacaceaeTeasel family
GenusKnautiaNamed after a 17th-century German botanist, Christian Knaut
SpeciesarvensisOf the fields

About plant names...

Field scabious is native throughout Europe. It has become naturalized in North America, after escaping from gardens, becoming overly common to invasive in some midwestern states. It is found along river banks and roadsides, and in meadows, pastures, waste ground, and well-lit forests.

Plants: 12-31" (30-80 cm) tall. Stems branch near the top, and are densely hairy and green to purplish, often with purple spots.

Leaves: Opposite, on short petioles or none at all, lanceloate-elliptic, gray-green, with soft hairs. The lowest leaves are up to 1" (3 cm) long. Stem leaves are pinnately divided, with a large terminal leaflet.

Flowers: Single flowers atop long stems are irregular, blue-violet, flattish or rounded, 1-1½" (2.5-3.8 cm) around. Each flower contains 85-100 florets. Florets near the center are funnel-shaped, with four lobes. Edge florets are larger and more irregular. Four violet-tipped stamens appear near the center of each flower. There are 8-12 sepals at the base of each flower. The calyx beneath the flower is small. Flowers appear June-August.

Fruits: A nutlet ~³/₁₆" (5-6 mm) × ¹/₁₆" (2 mm), thickly covered in hairs. A single plant produces up to 2000 seeds.

Medical: Flowers and stems are said to have an astringent, antiseptic, expectorant or purgative effect. None of these effects have been proven.

Online References:

Knautia arvensis on www.luontoportti.com

Knautia arvensis at Minnesota Wildflowers

Knautia arvensis on Wikipedia

Knautia arvensis on the New England Wildflower Society’s GoBotany site

Knautia arvensis on Wikispecies

References:

Clemants, Steven; Gracie, Carol, Wildflowers in the Field and Forest, Oxford University Press, 2006, p. 46

Multiple Authors, PDR for Herbal Medicines, Thomson Healthcare Inc., 2007, p. 326

Knautia arvensis (Field Scabious, Blue Buttons)

7/6/2017 · Mt. Watatic, access road, Ashby, MA
≈ 2½ × 2" (6.2 × 5.9 cm)

Knautia arvensis (Field Scabious, Blue Buttons)

7/6/2017 · Mt. Watatic, access road, Ashby, MA
≈ 4 × 4½" (11 × 12 cm)

Knautia arvensis description by Thomas H. Kent, last updated 7 Jul 2017.

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Knautia arvensis (Field Scabious, Blue Buttons)

7/6/2017 · Mt. Watatic, access road, Ashby, MA
≈ 3 × 4" (8.1 × 10 cm)

Knautia arvensis (Field Scabious, Blue Buttons)

7/6/2017 · Mt. Watatic, access road, Ashby, MA
≈ 2½ × 2½" (6.6 × 6.8 cm)

Knautia arvensis (Field Scabious, Blue Buttons)

7/6/2017 · Mt. Watatic, access road, Ashby, MA
≈ 10 × 6" (24 × 16 cm)

Knautia arvensis (Field Scabious, Blue Buttons)

7/6/2017 · Mt. Watatic, access road, Ashby, MA
≈ 6 × 4" (16 × 11 cm)

Knautia arvensis (Field Scabious, Blue Buttons)

7/6/2017 · Mt. Watatic, access road, Ashby, MA
≈ 2½ × 2½" (6.2 × 6.5 cm)

Knautia arvensis (Field Scabious, Blue Buttons)

7/6/2017 · Mt. Watatic, access road, Ashby, MA
≈ 7 × 5" (18 × 12 cm)

Range:

About this map...