Species: Senecio integerrimus var. scribneri (Rydb.) T.M. Barkl.

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Senecio integerrimus var. scribneri (Rydb.) T.M. Barkl.

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TAXONOMY

Family:

Asteraceae or Compositae

Genus:

Senecio

Species Synonyms:

Senecio scribneri Rydb.

Common Names:

Scribner’s ragwort

DISTRIBUTION

Canada:

southwestern Saskatchewan

Saskatchewan:

southwestern Saskatchewan; Lower Frenchman River

Ecoregion:

Mixed Grassland

HABITAT

Saskatchewan:

eroded, clayey, grassland slopes

RARITY STATUS

Provincial Status According
to Harms (2003):

Endangered

Nature Conservancy Status:

G4Q N2 S1

Saskatchewan Species at
Risk Status:

None

COSEWIC Status:

Special Concern

Senecio integerrimus var. scribneri is endangered because it is highly restricted and extremely rare in Saskatchewan. It is usually locally numerous within limited localized areas.

SPECIES DESCRIPTION

Roots:

numerous fleshy fibrous roots

Stems:

caudex short, button-like; stems solitary, villous when young, less so in age

Leaves:

basal and cauline; basal abruptly petiolate or tapering to broadly winged petiole, petiole about equalling blade, 6 – 25 cm long, lanceolate to obovate, villous, margin entire to irregularly dentate; cauline leaves reduced upwards, villous

Inflorescence:

heads radiate, 6 – 20 in corymbiform cyme, central terminal head on shortened peduncle; phyllaries 21 or 13, 7 – 15 mm long, black-tipped

Flowers:

ligulate florets (0) 13 or 8, 6 – 15 mm long, yellow; tubular florets many

Fruits:

achenes glabrous

*KEY TO SENECIO* IN SASKATCHEWAN**

1 Leaves reduced upwards, basal leaves present at time of flowering; caudex button-like	2 (S. integerrimus)
1 Leaves distributed equally along stem or concentrated upwards, basal leaves withering at time or flowering; root otherwise, caudex if present, not button-like	4

2 Leaves essentially glabrous or glabrate at flowering; involucre tips green, minutely black at tip or not at all	S. integerrimus var. integerrimus
2 Leaves arachnose-tomentose or villous at time of flowering; involucre tips black	3

3 Basal leaves oblong to lanceolate; heads 3 – 6	S. integerrimus var. scribneri
3 Basal leaves elliptic to oblanceolate; heads 6 – 15	S. integerrimus var. exaltatus

4 With well-developed rhizomes or caudices	S. eremophilus var. eremophilus
4 Without prominent caudices or rhizomes	5

5 Leaves densely glandular-viscid	S. viscous
5 Leaves glabrous or hairy but not glandular	6

6 Plants with abundant soft-villous pubescence	S. congestus
6 Plants glabrous or sparsely tomentose	S. vulgaris