Zs. P. Komáromy szerk.: Studia Botanica Hungarica 13. 1979 (Budapest, 1979)

Szerdahelyi, Tibor: Rare ferns of Hungary, I. Botrychium virginianum (L.) Sw. var. europeum Angstr. in the Kiskunság National Park

Table 5. Species occurring together with B. virginianum and the frequency of their occurrences Species Frequency Botrychium virginianum Robinia pseudo-acacia Viola cyanea Geum urbanum Bromus sterilis 4 Calamintha clinopodium Chelidonium majus 3 Celtis occidentalis Draba nemorosa Geranium Robertianum Rhamnus catharticus Rubus caesius 2 Taraxacum officinale Carex spicata ssp. Lumnitzeri Ballota nigra Thalictrum minus Sambucus nigra Galium aparine Aegopodium podagraria Anthriscus cerefolium Cerastium sp. Muscari racemosum 1 REFERENCES JÁVORKA, S. (1925): Hungarian flora. - Studium, Budapest, 1307 pp. JÁVORKA, S. - CSAPODY, V. (1975): Iconographia Florae Partis AustroOrientalis Europae Centralis. - Akadémiai Press, Budapest, 576 pp. PIELOU, E.C. (1975): Ecological diversity. - Wiley, New York - Toronto, 165 pp. SHANNON, CE. - WEAVER, W. (1948): The mathematical theory of communication. - Univ. Illinois Press, Urbana 117 pp. SOÓ, R. - JÁVORKA, S. (1951): Handbook of the Hungarian flora. - Akadémiai Press, Budapest, 1120 pp.