Senecio subdentatus (Gintzburger et al., 2003)

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Scorzonera gageoides
Gintzburger et al., Rangelands in Uzbekistan, 2003
Senecio subdentatus (Gintzburger et al., 2003)
Leontice incerta
Senecio subdentatus
Senecio subdentatus

Senecio subdentatus Ledeb.

Local name:

  • Russian: Крестовник малозубчатый - krestovnik malozubčatyj
  • Uzbek: Sarykbosh, Yapyr

Chromosome number: 2n = 60 (Matveeva and Tikhonova unpublished data).

Description and morphology: Annual ephemeral herb (height 5–30 cm). Stem: glabrous ascending or erect, branchy from base. Leaves: bottom – sessile, dense, white woolly on under surface; middle and upper – on short petioles, alternate, dentate on margins, oblong-lanceolate (2.5–7.0 cm long, 0.2–1.0 cm wide) without stipules. Flowers: bisexual; heads radiate, usually in friable panicle when dry or in corymbose clusters (3–5 or numerous), heterogamous. Involucral bracts 1-seriate. Ray florets flattened, female; disk florets tubular (3–8 mm in diameter), yellow. Pappus of simple hairs.

Reproduction: Sexual. Typical entomophilous plant. Flowering: March–May. Fruit maturation: May–July. Fruit: achenes (3–5 mm long), narrow, cylindrical, ribbed without a beak. Seed: indehiscent monospermous with erect, well differentiated embryo without endosperm. Dormancy B1 type. Light-sensitive. Germinates at 20 °C (about 79%). Stratification at 5 °C induces germination under both light and dark conditions.

Pastoral importance: Grazed by livestock in spring, both as pasture and hay.

Economic interest: Contains alkaloids: senetsin and senetsifolin. Liquid tincture and extract from aboveground organs used for regulation of blood pressure as well as a treatment for gastric and mental disorders.

Habitat: Occurs mostly on sands, also, but rarely, on rocky-gravelly soils; occasionally as a weed in crops on sierozem. Grows as single plants or in patches.

Distribution: Central Asia, Caucasus, Siberia, Mongolia and western China. Also in North Africa and Middle East.