Species: Rorippa curvipes var. truncata (Jepson) Rollins

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Rorippa curvipes var. truncata (Jepson) Rollins

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TAXONOMY

Family:

Brassicaceae

Genus:

Rorippa

Species Synonyms:

Rorippa obtusa var. integra (Rydb.) Victorin
Radicula sinuata var. truncata Jepson
Rorippa curvipes var. integra (Rydb.) R. Stuckey
Rorippa truncata (Jepson) R. Stuckey

Common Names:

bluntleaf yellowcress
wild yellowcress
curved yellowcress

DISTRIBUTION

Canada:

southwestern British Columbia - southern Alberta - southern Saskatchewan

Saskatchewan:

southern Saskatchewan; Hoosier - Kindersley - Pangman

Ecoregion:

Mixed Grassland, Moist Mixed Grassland

HABITAT

Saskatchewan:

non-alkaline, drying mudflats and edges of sloughs in sandy or clay soil

Associated Species:

Alopecurus aequalis, Beckmannia syzigachne, Gnaphalium palustre, Limosella aquatica, Polygonum sp., Rumex sp., Spergularia salina, Veronica peregrina

RARITY STATUS

Provincial Status According
to Harms (2003):

Vulnerable

Nature Conservancy Status:

G5T5 S2S3

Saskatchewan Species at
Risk Status:

None

COSEWIC Status:

None

Why rare?

SPECIES DESCRIPTION

Height:

10 – 40 cm (long)

Roots:

taproot

Stems:

annual, several, tufted, decumbent to prostrate, branched, glabrous

Leaves:

basal and cauline, basal leaves grading into cauline, alternate, short-petiolate, may be slightly auriculate, 3 – 10 cm long, 7 – 20 mm wide, deeply to shallowly pinnately lobed, lobes entire to dentate, terminal lobe larger than lateral lobes and ovate, apex obtuse, hyaline ridges on midrib

Inflorescence:

raceme lateral, many-flowered, elongating in fruit; pedicels short

Flowers:

calyx 0.9 – 1.5 mm long, slightly saccate; corolla 0.9 – 1.2 mm long, whitish; style linear, straight, abruptly attached to obtuse apex; stigma expanded, disk-like

Fruits:

silique short, 3.5 – 5.5 mm long, 2 – 4 times longer than wide, 1.8 – 2.5 times longer than pedicels, cylindrical, constricted at center, glabrous, readily dehiscent; seeds 30 – 80 per silique, 0.5 mm long

*KEY TO RORIPPA* IN SASKATCHEWAN**

1 Corolla longer than calyx	2
1 Corolla shorter than or equal to calyx	4

2 Middle and upper leaves serrate to nearly entire, not pinnatifed; pedicels usually 3 – 4 times longer than fruit; siliques globose to subglobose	R. austriaca
2 Middle and upper leaves pinnatifed, the divisions toothed; pedicels only slightly longer than fruit; siliques cylindrical	3

3 Stems erect; leaves and stem glabrous or sparingly pubescent, lacking trichomes; leaf divisions acute, toothed	R. sylvestris
3 Stems decumbent to prostrate; leaves and stems with trichomes; leaf divisions obtuse, entire to denticulate	R. sinuata

4 Stems sparingly to densely hirsute below	5
4 Stems glabrous throughout	7

5 Leaves thin, upper and lower pinnatifed; pods 3 – 4 mm long	R. palustris var. palustris
5 Leaves firm, upper leaves dentate to shallowly lobed; pods 2 – 9 mm	6

6 Stems sparsely hirsute below; siliques slenderly ellipsoid, 3 – 9 mm long	R. palustris var. fernaldiana
6 Stems densely hirsute below; siliques subglobose, 2 – 5.5 mm long	R. palustris var. hirsuta

7 Fruiting styles straight; silique 2 – 4 times longer than wide, glabrous, constricted at center	R. curvipes var. truncata
7 Fruiting styles tapering towards the apex; silique more than 4 times as long as wide, with minute papillae, not constricted at center	R. tenerrima