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Descurainia pinnata (Walter) Britton
TANSY-MUSTARD
Western tansymustard

Life   Plantae   Dicotyledoneae   Brassicaceae   Descurainia

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Descurainia pinnata
© Copyright Bobby Hattaway 2011 · 5
Descurainia pinnata
Descurainia pinnata
© Copyright Bobby Hattaway 2011 · 5
Descurainia pinnata

Descurainia pinnata
© Copyright Bobby Hattaway 2011 · 5
Descurainia pinnata
Descurainia pinnata
© Copyright Bobby Hattaway 2011 · 5
Descurainia pinnata

Descurainia pinnata
© Copyright Bobby Hattaway 2011 · 5
Descurainia pinnata
Descurainia pinnata, leaf and flower and fruit
© Kay Yatskievych, 2003 · 1
Descurainia pinnata, leaf and flower and fruit

Descurainia pinnata, seed
© Copyright Seeds USID 2015 · 1
Descurainia pinnata, seed
Descurainia pinnata, seed
© Copyright Seeds USID 2015 · 1
Descurainia pinnata, seed

Descurainia pinnata, seed
© Copyright Seeds USID 2015 · 1
Descurainia pinnata, seed

Associates · map
FamilyScientific name @ source (records)
Albuginaceae  Albugo candida @ BPI (7)
Andrenidae  Andrena candida @ BBSL (6)

Andrena capricornis @ BBSL (1)

Andrena illinoiensis @ BBSL (4)

Andrena livida @ BBSL (4)

Andrena melanochroa @ BBSL (2)

Andrena piperi @ BBSL (1)

Andrena prunorum @ BBSL (1)

Andrena scurra @ BBSL (3)
Colletidae  Colletes phaceliae @ BBSL (1)
Halictidae  Halictus ligatus @ AMNH_BEE (1)

Halictus parallelus @ AMNH_BEE (1)

Lasioglossum incompletum @ BBSL (1)

Lasioglossum pruinosum @ BBSL (1)

Lasioglossum pulveris @ BBSL (2)

Lasioglossum sedi @ BBSL (1)

Lasioglossum sisymbrii @ BBSL (3)
Miridae  Orthotylus whiteheadi @ AMNH_IZC (4)
Peronosporaceae  Peronospora parasitica @ BPI (14)

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Following modified from MissouriPlants.com
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Descurainia pinnata (Walt.) Britt. - Tansy Mustard

Descurainia pinnata plant

Family - Brassicaceae

Stems - To +70cm tall, herbaceous, erect, typically multiple from stout taproot, branching above, dense glandular pubescent.

Descurainia pinnata stem

Leaves - Alternate, sessile, to +15cm long, 6-7cm broad, reduced upward, pinnate to deeply pinnatifid, pubescence simple, forked, or branching, also glandular. Leaflets typically pinnatifid. Leaf rachis channeled above.

Descurainia pinnata leaf

Inflorescence - Terminal raceme, very compact in flower, much elongating in fruit, to + 25cm long (tall). Flowers on short pedicels to 4mm long, typically glabrous. Pedicels elongating in fruit.

Descurainia pinnata inflorescence Inflorescence.

Flowers - Petals 4, yellow, -2mm long, 1mm broad, glabrous, spreading to recurving slightly at apex, obtuse at apex. Stamens 6. Filaments to 1.5mm long, yellow, glabrous. Anthers yellow, .2mm long. Ovary terete, subcylindric, 1mm long. Siliques to +/-1cm long, 2mm in diameter, subterete to 4-angled, many seeded. Seeds brown, 1mm in diameter. Fruiting pedicel to 1.5cm long.

Flowering - March - June.

Habitat - Waste ground, disturbed sites, open woods, prairies, glades, roadsides, railroads.

Origin - Native to U.S.

Other info. - This species is common in Missouri and can be found throughout the state. Another species, D. sophia (L.) Webb , which is introduced from Europe, is becoming common. The two can be distinguished by fruit size and leaf character.
I didn't get pics of the flowers of D. pinnata , but they are very close to those of D. sophia , so check out that page to see the flowers.

Photographs taken at Eagle Bluffs Conservation Area, Boone County, MO., 4-11-04.


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Following modified from Plants Database, United States Department of Agriculture
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Following modified from Flora of North America
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Link to Flora of North America home
 
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FNA Vol. 7 Page 519, 520, 521, 523, 525, 526 , 527 Login | eFloras Home | Help
FNA | Family List | FNA Vol. 7 | Brassicaceae | Descurainia

11. Descurainia pinnata (Walter) Britton, Mem. Torrey Bot. Club. 5: 173. 1894.

Erysimum pinnatum Walter, Fl. Carol. 174. 1788; Sophia pinnata (Walter) Howell

Annuals; glandular or egland-ular; sparsely to densely pubescent, sometimes glabrous distally, canescent or not, trichomes dendritic. Stems erect, unbranched or branched basally and/or distally, (0.8-)1.3-5.7(-9.2) dm. Basal leaves: petiole 0.5-3.6 cm; blade 1- or 2-pinnate, ovate or oblong to oblanceolate in outline, 1-15 cm, lateral lobes (4-9 pairs), linear or oblanceolate to ovate, margins entire or dentate. Cauline leaves sessile or shortly petiolate; blade smaller distally, distal lobes often narrower, surfaces densely pubescent. Racemes considerably elongated in fruit. Fruiting pedicels usually ascending to divaricate or horizontal, rarely descending (at 20-110º angle), straight or slightly recurved, 4-18 (-23) mm. Flowers: sepals spreading to ascending, yellow, purple, or rose, oblong, 0.8-2.6 mm, pubescent; petals (whitish or yellow), narrowly oblanceolate, 1-3 × 0.3-1 mm; median filaments 1-2.8 mm; anthers 0.2-0.4 mm. Fruits erect to ascending, usually clavate, rarely broadly linear (wider distally), not torulose, 4-13(-17) × 1.2-2.2 mm; valves each with distinct midvein; septum not veined; ovules 16-40 per ovary; style obsolete, 0.02-0.2 mm, glabrous. Seeds biseriate, reddish brown, oblong, 0.6-0.9 × 0.4-0.5 mm.

Subspecies 4 (4 in the flora): North America, n Mexico.

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Following modified from CalPhotos
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http://calphotos.berkeley.edu/cgi/img_query?query_src=dl&where-taxon=Descurainia+pinnata+ssp.+brachycarpa+&where-lifeform=specimen_tag&rel-lifeform=ne&rel-taxon=begins+with&where-lifeform=Plant ---> https://calphotos.berkeley.edu/cgi/img_query?query_src=dl&where-taxon=Descurainia+pinnata+ssp.+brachycarpa+&where-lifeform=specimen_tag&rel-lifeform=ne&rel-taxon=begins+with&where-lifeform=Plant
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Following modified from CalPhotos
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Updated: 2018-02-24 04:26:29 gmt
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