Discussion

Gypsophila species are widely grown as ornamentals. In addition to those treated below, other European and Asiatic species have appeared sporadically in disturbed habitats in the flora area, sometimes remote from any site where likely to have been planted, but have not become established. Gypsophila pilosa Hudson [G. porrigens (Linnaeus) Boissier], which differs from G. elegans in its stems villous or hispid proximal to the inflorescence, slender pedicels that persist after the flowers and fruits have fallen, and consistently pink petals, has been found at waste-disposal sites in Maryland, New York, and Oregon. Gypsophila repens Linnaeus, a rhizomatous perennial species with prostrate to decumbent primary stems and more or less erect flowering branches to 3 dm, similar to G. elegans in floral characters, has been found escaped from cultivation in British Columbia and Maine. Gypsophila oldhamiana F. A. W. Miquel was found in a field in Alabama in 1969 [Rebois 049 (AUA)]. It has pink petals and differs from other species described here in its densely corymboid to subcapitate inflorescences. Additional species are cultivated in the flora area. All reports of Gypsophila acutifolia Steven ex Sprengel, G. perfoliata Linnaeus in the narrow sense, G. stevenii Fischer ex Schrank, G. arrostii Gussone, and G. pacifica Komarov (G. perfoliata var. latifolia Maximowicz) as naturalized species in the flora area appear to have been based on misidentified G. scorzonerifolia. The inflorescences of G. acutifolia are denser than those of G. scorzonerifolia, with the pedicels of the former being less than two times the calyx length, and those of the latter mostly being more than two times as long. True G. perfoliata and G. pacifica, neither of which is known in North America outside of cultivation, differ from G. scorzonerifolia in having glabrous pedicels and calyces; G. perfoliata differs also in having almost completely green sepals with the narrow white margins not sharply defined, and minutely rather than coarsely tuberculate seed coats. All of the species described below, especially Gypsophila scorzonerifolia, can be expected to be found elsewhere in the flora area.

Discussion

Gypsophila species are widely grown as ornamentals. In addition to those treated below, other European and Asiatic species have appeared sporadically in disturbed habitats in the flora area, sometimes remote from any site where likely to have been planted, but have not become established. Gypsophila pilosa Hudson [G. porrigens (Linnaeus) Boissier], which differs from G. elegans in its stems villous or hispid proximal to the inflorescence, slender pedicels that persist after the flowers and fruits have fallen, and consistently pink petals, has been found at waste-disposal sites in Maryland, New York, and Oregon. Gypsophila repens Linnaeus, a rhizomatous perennial species with prostrate to decumbent primary stems and more or less erect flowering branches to 3 dm, similar to G. elegans in floral characters, has been found escaped from cultivation in British Columbia and Maine. Gypsophila oldhamiana F. A. W. Miquel was found in a field in Alabama in 1969 [Rebois 049 (AUA)]. It has pink petals and differs from other species described here in its densely corymboid to subcapitate inflorescences. Additional species are cultivated in the flora area. All reports of Gypsophila acutifolia Steven ex Sprengel, G. perfoliata Linnaeus in the narrow sense, G. stevenii Fischer ex Schrank, G. arrostii Gussone, and G. pacifica Komarov (G. perfoliata var. latifolia Maximowicz) as naturalized species in the flora area appear to have been based on misidentified G. scorzonerifolia. The inflorescences of G. acutifolia are denser than those of G. scorzonerifolia, with the pedicels of the former being less than two times the calyx length, and those of the latter mostly being more than two times as long. True G. perfoliata and G. pacifica, neither of which is known in North America outside of cultivation, differ from G. scorzonerifolia in having glabrous pedicels and calyces; G. perfoliata differs also in having almost completely green sepals with the narrow white margins not sharply defined, and minutely rather than coarsely tuberculate seed coats. All of the species described below, especially Gypsophila scorzonerifolia, can be expected to be found elsewhere in the flora area.

Discussion

Gypsophila species are widely grown as ornamentals. In addition to those treated below, other European and Asiatic species have appeared sporadically in disturbed habitats in the flora area, sometimes remote from any site where likely to have been planted, but have not become established. Gypsophila pilosa Hudson [G. porrigens (Linnaeus) Boissier], which differs from G. elegans in its stems villous or hispid proximal to the inflorescence, slender pedicels that persist after the flowers and fruits have fallen, and consistently pink petals, has been found at waste-disposal sites in Maryland, New York, and Oregon. Gypsophila repens Linnaeus, a rhizomatous perennial species with prostrate to decumbent primary stems and more or less erect flowering branches to 3 dm, similar to G. elegans in floral characters, has been found escaped from cultivation in British Columbia and Maine. Gypsophila oldhamiana F. A. W. Miquel was found in a field in Alabama in 1969 [Rebois 049 (AUA)]. It has pink petals and differs from other species described here in its densely corymboid to subcapitate inflorescences. Additional species are cultivated in the flora area. All reports of Gypsophila acutifolia Steven ex Sprengel, G. perfoliata Linnaeus in the narrow sense, G. stevenii Fischer ex Schrank, G. arrostii Gussone, and G. pacifica Komarov (G. perfoliata var. latifolia Maximowicz) as naturalized species in the flora area appear to have been based on misidentified G. scorzonerifolia. The inflorescences of G. acutifolia are denser than those of G. scorzonerifolia, with the pedicels of the former being less than two times the calyx length, and those of the latter mostly being more than two times as long. True G. perfoliata and G. pacifica, neither of which is known in North America outside of cultivation, differ from G. scorzonerifolia in having glabrous pedicels and calyces; G. perfoliata differs also in having almost completely green sepals with the narrow white margins not sharply defined, and minutely rather than coarsely tuberculate seed coats. All of the species described below, especially Gypsophila scorzonerifolia, can be expected to be found elsewhere in the flora area.