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The pollen morphology of eight species from the section Orobus (L.) Gren. et Godr. (Lathyrus, Fabaceae) distributed in Bulgaria (Lathyrus alpestris, L. aureus, L. linifolius, L. niger, L. palustris, L. transsilvanicus, L. venetus and L. vernus.) was studied with light and scanning electrone microscope. The pollen grains are 3-zonocolporate of subprolate (semi-erectus) type (P/E=1.20–1.31), medium to large in size, elliptical or rectangular-obtuse- convex (equatorial view) and circular to slightly triangular-obtuse-convex (polar view). The ornamentation is predominantly perforate-foveolate but there are pollen grains with perforate-reticulate sculpture (L. alpestris, L. palustris) or almost reticulate (L. aureus).

The flora of the Nebet Tepe Architectural Reserve in the city of Plovdiv (Thracian Plain) was studied in the period 1998–2003. The number of plants growing spontaneously on and around the fragments of the fortification wall and on the pavements is 131. The flora is analyzed with respect to the local distribution of the taxa, their chorology, life form and geoelement characteristics. The flora contains a relatively high proportion of ruderals and weeds. The hemicryptophytes and therophytes constitute the largest group. The following families are distinguished by the greatest number of species: Asteraceae (14), Fabaceae (13), Poaceae (12), Brassicaceae (8), Scrophulariaceae (7), Caryophyllaceae (7). The species Cerastium tauricum Spreng. and Melica transsilvanica Schur are recorded for the first time for the flora of the Thracian Plain floristic region. The results are compared with other European and Mediterranean wall floras.