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Cardamine hirsuta L.
HAIRY BITTERCRESS
Hairy Wood Cress; Common Bitter Cress; Hairy Woodcress; Common Bittercress; Common Bitter-cress; Hairy Bitter-cress

Life   Plantae   Dicotyledoneae   Brassicaceae   Cardamine

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Cardamine hirsuta
© Copyright Bobby Hattaway 2011 · 5
Cardamine hirsuta
Cardamine hirsuta
© Copyright Bobby Hattaway 2011 · 5
Cardamine hirsuta

Cardamine hirsuta
© Copyright Bobby Hattaway 2011 · 5
Cardamine hirsuta
Cardamine hirsuta
© Copyright Bobby Hattaway 2011 · 5
Cardamine hirsuta

Cardamine hirsuta
© Copyright Bobby Hattaway 2011 · 5
Cardamine hirsuta
Cardamine hirsuta
© Copyright Bobby Hattaway 2011 · 5
Cardamine hirsuta

Cardamine hirsuta
© Copyright Bobby Hattaway 2011 · 5
Cardamine hirsuta
Cardamine hirsuta PMax
© Copyright source/photographer · 5
Cardamine hirsuta PMax

Cardamine hirsuta PMax
© Copyright source/photographer · 5
Cardamine hirsuta PMax
Cardamine hirsuta PMax
© Copyright source/photographer · 5
Cardamine hirsuta PMax

Cardamine hirsuta
© Les Mehrhoff, 2008-2010 · 4
Cardamine hirsuta
Cardamine hirsuta, whole plant - in flower - general view
© Copyright Steve Baskauf, 2002-2011 · 4
Cardamine hirsuta, whole plant - in flower - general view

Cardamine hirsuta, fruit - as borne on the plant
© Copyright Steve Baskauf, 2002-2011 · 4
Cardamine hirsuta, fruit - as borne on the plant
Cardamine hirsuta, inflorescence - whole - unspecified
© Copyright Steve Baskauf, 2002-2011 · 4
Cardamine hirsuta, inflorescence - whole - unspecified
Identification
Cardamine hirsuta has a marginal fringe of hairs at the base of the leafstalks on stem leaves. Cardamine parviflora and Cardamine pensylvanica do not.

Names
Scientific source:

Supported by

Associates · map
FamilyScientific name @ source (records)
Albuginaceae  Albugo candida @ BPI (5)
Andrenidae  Andrena arabis @ UCMS_ENT (2)
Peronosporaceae  Peronospora parasitica @ BPI (2)

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Following modified from Delaware Wildflowers
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Delaware Wildflowers  •  Scientific names

Cardamine hirsuta L. Hairy Bittercress
Brassicaceae — Mustard family
Non-native
Cardamine hirsuta
The backyard
April 2001 Cardamine hirsuta
The backyard
March 2012 Cardamine hirsuta Cardamine hirsuta
The tiny hairs at the base of the leaf stalks are why it's called "hairy". The front yard
April 2013

Guide to Cardamine of Delaware

Search Google Delaware USDA

Photos copyright David G. Smith

Delaware Wildflowers main page

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Following modified from Flora of North America
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FNA Vol. 7 Page 466, 475 Login | eFloras Home | Help
FNA | Family List | FNA Vol. 7 | Brassicaceae | Cardamine

18. Cardamine hirsuta Linnaeus, Sp. Pl. 2: 655. 1753.

Annuals; sparsely hirsute basally (at least on petiole of basal leaves), often glabrous distally. Rhizomes absent. Stems erect, ascending, or decumbent, unbranched or branched basally and/or distally, (0.3-)1-3.5 (-4.5) dm, (not flexuous). Basal leaves (persistent to anthesis), rosulate, (5-)8-15(-22)-foliolate, (2-)3.5-15(-17) cm, leaflets petiolulate; petiole 0.5-5 cm, (ciliate); lateral leaflet blade oblong, ovate, obovate, or orbicular, smaller than terminal, margins entire, repand, crenate, or 3-lobed; terminal leaflet (petiolule 0.2-1 cm), blade reniform or orbicular, 0.4-2 cm × 6-30 mm, margins entire, repand, dentate, or 3 or 5-lobed. Cauline leaves 1-4(-6), compound as basal, petiolate, [(0.5-)1.2-5.5 (-7) cm, including petiole], leaflets petiolulate; blade base not auriculate; leaflets similar to basal. Racemes ebracteate. Fruiting pedicels erect to ascending, (2-) 3-10(-14) mm. Flowers: sepals oblong, 1.5-2.5 × 0.3-0.7 mm, lateral pair not saccate; petals (sometimes absent) white, spatulate, 2.5-4.5(-5) × 0.5-1.1 mm; (stamens usually 4, lateral pair often absent, rarely 5 or 6); filaments 1.8-3 mm; anthers ovate, 0.3-0.5 mm. Fruits linear, (torulose), (0.9-)1.5-2.5(-2.8) cm × (0.8-)1-1.4 mm, (often appressed to rachis); ovules 14-40 per ovary; style 0.1-0.6(-1) mm. Seeds light brown, oblong or subquadrate, 0.9-1.3(-1.5) × 0.6-0.9 (-1.1) mm, (narrowly margined). 2 n = 16.

Flowering Feb-Jul. Roadsides, clearings, disturbed sites, slopes, cedar glades, mixed woods, meadows, fields, waste grounds, damp places, grassy areas; 0-700 m; introduced; B.C., Ont.; Ala., Ark., Calif., Conn., Del., D.C., Fla., Ga., Ill., Ky., La., Md., Mass., Mich., Miss., Mo., N.J., N.Y., N.C., Ohio, Okla., Oreg., Pa., S.C., Tenn., Tex., Utah, Va., Wash., W.Va.; w Eurasia; introduced also in Central America, South America, e Asia (Japan), South Africa, Australia.

Herbarium specimens of Cardamine hirsuta have been misidentified as C. oligosperma .

Updated: 2021-01-15 22:55:13 gmt
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