Matskási István (szerk.): A Magyar Természettudományi Múzeum évkönyve 101. (Budapest 2009)

Somlyay, L.: Occurrence of Chamaesyce glyptosperma, and a survey of the genus Chamaesyce (Euphorbiaceae) in Hungary

Occurrence of Chamaesyceglyptosperma in Hungary (Euphorbiaceae) 25 which is actually a new species to the flora of Hungary. The population (at least one hundred individuals) was found in a stony ruderal place on sandy subsoil on the outskirts of Budapest. However, during the revision of Chamaesyce material in BP I have found a former specimen of C. glyptosperma from Hungary erroneously identified as Euphorbia humifusa (see above). The latter record comes from a potato field near Agárd (at Lake Velence, Fejér county, central Hungary) (PRISZTER 1960). Hence, at the moment two occurrences of C. glyptosperma supported with vouchers are registered in the Hungarian flora. Of the Chamaesyce species introduced to Europe C. glyptosperma can be easily identified by the combination of the following characters: the plant (at least the leaves and fruits) is completely glabrous, the seed is c. 1 mm long, subovate in shape (with cut ground), and the (ripe) seed-coat is rugose (Fig. 1). The plant is similar to C. humifusa, however, the shape of the seed of the latter species is ovate (with rounded ground) and the seed-coat is always smooth. Furthermore, C. humifusa is invariably prostrate, its leaves are more or less ovate (c. 1.5-2x as long as wide), not curved, while C. glyptosperma is somewhat ascending (at least when young), its leaves are elongate (2-4x as long as wide) and often slightly curved. Fig. 1. Seeds of Chamaesyce glyptosperma (ENGELMANN) SMALL, 1903 collected in Budapest in 2008. Scale bar = 1 mm ;> Annls hist.-nat. Mus. natn. hung. 101, 2009