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

Scribner’s ragwort 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:

stem base short, button-like, persistent, woody; stems solitary, long-hairy when young, less so in age

Leaves:

basal and cauline; basal stalked or tapering to broadly winged stalk, stalk about equalling blade, 6 – 25 cm long, lance-shaped to spoon-shaped, long-hairy, margin entire to irregularly toothed; stem leaves reduced upwards, long-hairy

Inflorescence:

heads with ray and disc flowers, 6 – 20 in a cluster, central terminal head on shortened stalk; bracts 21 or 13, 7 – 15 mm long, black-tipped

Flowers:

ray flowers (0) 13 or 8, 6 – 15 mm long, yellow

Fruits:

achenes hairless

*KEY TO SENECIO* IN SASKATCHEWAN**

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

2 Leaves essentially hairless at flowering; bract tips green, minutely black at tip or not at all	S. integerrimus var. integerrimus
2 Leaves long-hairy at time of flowering; bract tips black	3

3 Basal leaves oblong to lance-shaped; heads 3 – 6	S. integerrimus var. scribneri
3 Basal leaves elliptic to inversely lance-shaped; heads 6 – 15	S. integerrimus var. exaltatus

4 With well-developed horizontal, underground stems or woody stem bases	S. eremophilus var. eremophilus
4 Without prominent woody stem bases or horizontal, underground stems	5

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

6 Plants with abundant soft-long hairs	S. congestus
6 Plants hairless or sparsely woolly-hairy	S. vulgaris