Northern Prairie Wildlife Research Center
Aquatic and Wetland Vascular Plants of the Northern Great Plains
Brassicaceae - The Mustard Family
Annual, biennial or perennial herbs with alternate, exstipulate, simple to compound
leaves, the blades entire to dentate, sinuate, laciniate or pinnately
lobed or divided. Flowers in terminal and lateral, ebracteate racemes,
these indeterminate in development so that the lower portion is often in fruit
while flowers continue to be produced at the tip; pedicels elongating
in fruit. Flowers minute to conspicuous, perfect, regular; sepals
4, usually deciduous; petals 4, yellow, white or pink, clawed at the
base; stamens 6, the outer 2 stamens shorter than the inner 4; pistil
1, 2-carpellary, style 1, short, elongating in fruit, ovary superior, 2-celled,
elongating or enlarging in fruit, maturing into an elongate to cylindrical or
globose, sometimes curved, 2 (rarely 4)-valved capsule (termed a silique
in those included here), the 2 halves separated by a membranous replum which
persists on the pedicel after dehiscence, the seeds in 1 or 2 rows in
each cell of the fruit.
||Flowers white or pink.
||Flowers yellow or yellowish-green.
||Plants stoutly taprooted; siliques distinctly stipitate,
borne on a stipe that extends about 1 mm or more beyond the tip of the
||Plants fibrous-rooted, sometimes bulbous at the
base as well; siliques sessile on the pedicels.
||Seeds in 1 row in each cell of the silique; plants
of wet habitats but not usually growing in water.
||Seeds in 2 rows in each cell of the silique; plants
usually growing in water.
||Siliques linear or curved-linear, 20-30X or more
longer than wide; seeds in 1 row in each cell of the silique.
||Siliques linear-elongate or cylindrical to globose,
1-8(10)X longer than wide; seeds in 2 rows in each cell of the silique.
22. Brassicaceae, the Mustard Family
1. Barbarea R. Br. -- Winter cress
2. Cardamine L. -- Bitter cress
- 1. Barbarea vulgaris R. Br.
3. Nasturtium R. Br. -- Watercress
- 1. Cardamine bulbosa (Schreb.) B.S.P.
-- Spring cress
- 2. Cardamine pensylvanica Muhl. ex
Willd. -- Bitter Cress
4. Rorippa Scop. -- Yellow cress
- 1. Nasturtium officinale R. Br.
5. Thelypodium Endl.
- 1. Rorippa austriaca (Crantz) Bess.
-- Austrian field cress
- 2. Rorippa calycina (Engelm.) Rydb.
- 3. Rorippa curvipes Greene
- 4. Rorippa palustris (L.) Bess. --
Bog yellow cress
- 5. Rorippa sinuata (Nutt.) A.S. Hitche
-- Spreading yellow cress
- 6. Rorippa sylvestris (L.) Bess. --
Creeping yellow cress
- 7. Rorippa tenerrima Greene
- 8. Rorippa truncata (Jeps.) Stuckey
- 1. Thelypodium integrifolium (Nutt.)
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