Astragalus unifoliolatus (Gintzburger et al., 2003)

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Astragalus alopecias
Gintzburger et al., Rangelands in Uzbekistan, 2003
Astragalus unifoliolatus (Gintzburger et al., 2003)
Astragalus villosissimus
Astragalus unifoliolatus
Astragalus unifoliolatus
Astragalus unifoliolatus
Astragalus unifoliolatus
Astragalus unifoliolatus
Astragalus unifoliolatus


Astragalus unifoliolatus Bge

Local name:

  • Russian: Астрагал однолосточковый, сингрен - astragal odnolostočkovyj, singren
  • Uzbek: Singren

Chromosome number: 2n = 16 (Ledingham 1960; Fedorov 1969).

Description and morphology: Perennial shrub. Life span 8–12 years. Tap root system (to depth 2.5 m), with numerous adventitious roots. Early leaf shedding (June–August), and accelerated reproductive stage. Stem: thick angular, lignified, lowered, covered by dark grey bark. Annual branches (13–28 cm long), pale white or light grey, numerous, erect to spreading from base. Leaves: (2–6 cm), upper with 1 leaflet, lower with 3–5 short petiolate, retuse. Leaflets elliptic-lanceolate, slightly acuminate (1–5 cm long, 3–7 mm wide), densely pubescent. Stipules (2.0–2.5 mm), membranous, broadly triangular, accreted with base of petiole. Flowers: short pedunculate, purple-violet, solitary along branches, assembled in loose large spikes (about 1.5–2.2 cm). Calyx campanulate (3.5–4.5 mm long), densely pubescent, teeth lanceolate-linear, 3–4 times shorter than tube.

Reproduction: Sexual. Entomophilous and self-pollination also admitted. Flowering: April–May. Fruit maturation: May–July. Fruit: dry, dehiscent, membranous, 2-loculate, monospermous, long, woolly, oblong-ovate pod (8–12 mm) with a short nose at end. Seed: ovate-orbicular to elliptic (2.9 mm long, 1.4 mm wide), reniform, light green or greyish-yellow.

Pastoral importance: Medium. In mixtures with species of Convolvulus, Carex, Haloxylon and Calligonum, it is grazed all year round by Karakul sheep and camels. Expected edible biomass is about 0.1–0.35 t/ha.

Habitat: Psammophyte. Occurs on deep sand and sand dunes; co-colonizer of woody shrubs-Carex or Carex-Haloxylon plant associations on fixed and/or shifting sand with a deep water table.

Distribution: Endemic of Middle Asia (Karakum, Kyzylkum, delta of Amu-Darya and Sudunkli sands).