Chromosome numbers of four species of Drosera are newly reported. Chromosome counts for D. cistiflora (2n = 40), D. glanduligera (2n = 22), and D. nitidula (2n = 28) contribute toward a determination of new basic chromosome numbers for sects. Ptycnostigma (x = 10), Coelophylla (x = 11), and Lamprolepis (x = 11), respectively. The count of 2n = 30 for D. schizandra verifies the basic number previously reported for sect. Arachnopus. Chromosome numbers of various Drosera taxa have been reviewed and reported by Kondo (1966, 1969, 1970, 1971a, 1971b, 1973, 1976), Kondo & Whitehead (1971), and Kondo, Segawa & Nehira (1976). Since chromosome counts are of great biosystematic importance in Drosera, additional reports of chromosome numbers are useful and should contribute to a better understanding of the genus. MATERIALS AND METHODS Materials used in this study were collected from the following sources: Drosera cistiflora L. Ca. 11 km west of the center of Port Elizabeth, Republic of South Africa, south of the road leading to Humansdorp. Voucher specimen: Olivier 1948; deposited in the Herbarium, The University of Port Elizabeth (UPE). Drosera glanduligera Lehm. Western Australia, Australia (collected by W. J. Forrest, Te Puke, New Zealand). Voucher specimen: Forrest s.n.; deposited in the Herbarium, Faculty of Integrated Arts and Sciences, Hiroshima University (Kondo 1805). Drosera nitidula Planch. Native to Western Australia, Australia (exact source unknown; cultivated by M. Hirano, Tokyo, Japan). Voucher specimen: Hirano s.n.; deposited in the Herbarium, Faculty of Integrated Arts and Sciences, Hiroshima University (Kondo 1806). Drosera schizandra Diels. Native to Queensland, Australia (exact source unknown; cultivated by M. Hirano, Tokyo, Japan). Voucher specimen: Hirano s.n.; deposited in the Herbarium, Faculty of Integrated Arts and Sciences, Hiroshima University (Kondo 1807). Somatic chromosomes at midmetaphase were obtained from apical cells of shoots of the above mentioned clones. The shoot apices were treated with 0.002M hydroxyquinoline at 18?C for four hours before they were fixed in Carnoy's solution (95% ethanol:chloroform:glacial acetic acid in a ratio of 2:1:1) at 4?C, following which they were hydrolyzed and stained in a 10:1 mixture of 2% acetoorcein and 1 N-hydrochloric acid at room temperature (ca. 20?C) for 30 minutes, and then squashed in 2% aceto-orcein. RESULTS AND DISCUSSION Drosera cistiflora has a somatic chromosome number of 2n = 40 (Figs. 1-2). This chromosome number is different from that previously reported by Behre ' We thank Dr. A. J. Sharp, The University of Tennessee, Knoxville, for reading the manuscript. 2 Department of Environmental Sciences, Faculty of Integrated Arts and Sciences, Hiroshima University, Higashi-Senda-Machi, Hiroshima 730, Japan. 'Department of Botany, The University of Port Elizabeth, Port Elizabeth 6000, Republic of South Africa. ANN. MissouRi BOT. GARD. 66: 584-587. 1979. 0026-6493/79/0584-0587/$00.55/0 This content downloaded from 157.55.39.123 on Tue, 18 Oct 2016 06:00:14 UTC All use subject to http://about.jstor.org/terms 1979] KONDO & OLIVIER-CHROMOSOME NUMBERS OF DROSERA 585