ЭлБиб

7420.31590.

SERRATULA BULGARICA

ACHT. ET STOJ. -

LJ-71; SC (R. TZ.); SO-100304

Middle Danube Plain, the locality „Smradlikata1, the village of Hazhidimitrovo,

in a community of

Stipa tirsa,

with flowers, 3.05.2000.

The plant is spread in the neighboring locality ,,Kozarcheshme“ as well.

This locality is the most southwestern in the country. The species is very rare

and vulnerable. It needs special investigations. Until now the species was

known only from the Black Sea coast and North-Eastern Bulgaria (П e e в,

1992). It is enlisted in the IUCN Red List of Threatened Plants as rare.

7930.33690.

TARAXACUM BESSARAB1CUM

(HORN. ) HAND-

M A Z Z . - LJ-71; SC (R. TZ.); SO-101323, 101324

Middle Danube Plain, in the valley of Studena River, village of Alekovo,

on saline soils, with flowers and fruits, 11.10.2000.

In this locality the population is numerous. Until now this rare species was

known on saline soils in isolated localities on the Northern Black Sea coast

and the Tundzha hilly region (П e e в, 1992).

CONCLUSIONS

The rare species could be placed in three groups:

1. Species with relict refugia, low flexibility and restricted populations -

Celtis glabrata, Caragana frutex, Fritillaria orientalis, Limodorum abortivum,

Serratula bulgarica, Hedysarumgrandiflorumssp. bulgaricum, Goniolimon tataricum,

Nepeta parviflora, Dianthus nardiformis, Crambe tataria, Pulmonaria mollis.

The only measures, that could be taken for their conservation is the protection

of their habitats.

2. Rare species that are distributed on secondary habitats influenced by

human activity -

Cosipermum nitidum, Armoracia macrocarpa, Wolffia arrhiza,

Limonium bulgaricum, Taraxacum bessarabicum, Salvia verbenaca, Spyranthes

spiralis.

The conservation measures should be orientated to reducing human

interference and thus not disturbing the existence of the species.

3. Species preserved in secondary habitats replacing their natural habitats.

Such are

Marsilea quadrifolia, Potamogeton triqhoides, Nuphar lutea, Trapa

natans, Lemna gibba.

Ecological adaptation higher than the one described in

Bulgarian literature was established for these species. The capabilities of

preserving rare water plants in draining canals have not yet been an object of

special research. The efforts of the botanists are focused on research of the

existing marshes, which constitute a very small percentage of the wetland area.

The system of draining canals both in Bulgaria and Romania is significant and

the regions where they are found are insufficiently investigated from a floristic

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