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ANNUAL OF SOFIA UNIVERSITY "ST. KLIMENT OHRIDSKI”
FACULTY OF BIOLOGY
BOOK 2 -BOTANY
Volume 98. 2006
ANNUAIRE DE L’UNIVERSITE DE SOFIA “ST. KLIMENT OHRIDSKl”
FACULTY OF BIOLOGY
LIVRE 2 - BOTANIQUE
Tome 98, 2006
ASTRAGALUS
SPECIES AS STEPPE GEOELEMENTS IN THE
BULGARIAN FLORA
DQLJA PAVLOVA
Department ofBotany, Faculty o fBiology, Sofia University,
SDragan Tsankov Blvcl, Sofia 1164,, Bulgaria
e-mail:
pavlova@biofae.uiji-Sofia.bgAbstract-
In ope pail of the country - Northeastern Bulgaria, the Danube Plain, the Dobrudza area and
along the Northern Black Sea coast, are preserved primary steppe lloristic complexes mainly on calcareous
terrains with thin humic - carbonate soil, The present-day territories with steppe flora are rather poor in species
composition as a consequence of the climatic changes and the anthropogenic influence. Some of the steppe
species including representatives of the genus
Astragalus
L. have secondary enlarged their area penetrating also
into Southern Bulgaria, the migration of the steppe species was realized also along tiie classical south - politic
route. The species
Astragalus giadialhus
B oiss,,
A. angustifoiius
Lam,
A. aitosensis
Ivan isell, and
A.
thracicus
G riseb. ssp.
jankae
(Degen et Bornm.)Va)cv belong to this group. For most of the steppe
elements in Bulgaria no measures for protection and conservation are undertaken.
Key words: Astragalus,
steppe geoelements. Bulgaria
The steppe vegetation is widely distributed on the territory o f Bulgaria up to 600 -
700 m a.s.l and in the mountains sometimes it reaches 2000 m (Велчев, 1982) (Fig. 1),
This specific flora appears as a continuation in southwestern direction of the Pontic
steppes through the steppe vegetation o f Bessarabia, Romania and Dobrudza (S toya-
n o ff, 1926; Й орданов. 1936; Стоянов, 1941; Стефанов, 1943; Велчев , 1982).
According to Stoyanoff (1926) 60% of the species characteristic for the Russian steppes
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