A contribution to the taxonomy of theAgrostis mertensii-flaccida complex (Poaceae) in Japan

  • Tuguo Tateoka


Morphological, cytological and field observations on 20 populations of theAgrostis mertensii-flaccida complex were reported. The plants were found to be diploid, tetraploid, hexaploid, septaploid or octoploid with a basic chromosome number of x=7. The diploids were most wide-spread and diverse in habitat and morphology. The tetraploids were discovered in 3 sites in Hokkaido. The hexaploids and octoploids occurred on various mountains in central and northern Honshu as well as in some of Hokkaido. A septaploid plant was found on Mts. Daisetsu. Pollen studies showed that diploid and tetraploid plants had smaller grains when compared with those of the hexaploids and the octoploids. The diploids, though variable in morphology and ecology, seemed to belong to a taxon which was more or less deviated morphologically from the diploid or tetraploid taxa growing outside Japan. The tetraploids were indistinguishable morphologically from the diploids. The hexaploids in Honshu, which were clearly different from the hexaploids in Hokkaido in morphology, possessed unique spikelet features. The majority of the octoploids were found to be distinct from the diploids and the tetraploids in the length ratio of anther/lemma. Some morphological “marker” features which distinguished between the diploids and the octoploids were observed for all of their sympatric populations, though such “marker” traits varied according to the localities. The taxonomic and evolutionary relationships between these Japanese entities and the taxa growing outside Japan were discussed. In conclusion, setting aside some plants which require further investigations, the Japanese plants concerned were arranged into 3 species:Agrostis flaccida Hack., including 2X and 4X together with 3X previously reported;A. tateyamensis Tateoka, sp. nov., implying 6X in Honshu;A. mertensii Trin. including 8X. A description ofA. tateyamensis was given.


Chromosome Number Ploidy Level Length Ratio Tetraploid Plant Diploid Plant 
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  1. Björkman, S.O. 1951. Chromosome studies inAgrostis (A preliminary report). Hereditas37: 465–468.Google Scholar
  2. — 1960. Studies inAgrostis and related genera. Symb. Bot. Upsal.17(1): 1–112.Google Scholar
  3. Bolhovskih, Z.V., V.G. Grif, O.I. Zahar'eva, andT.S. Matveeva. 1969. Chromosome Numbers of Flowering Plants. Nauka, Leningrad.Google Scholar
  4. Chen, C.-C. andC.-C. Hsu. 1962. Cytological studies on Taiwan grasses (2). Chromosome numbers of some miscellaneous tribes. J. Jap. Bot.37: 300–313.Google Scholar
  5. Crawford, D.J. 1974. Variation in the seed proteins ofChenopodium incanum. Bull. Torr. Bot. Club101: 72–77.CrossRefGoogle Scholar
  6. Ehrlich, P.R. andP.H. Raven. 1969. Differentiation of populations. Science165: 1228–1232.PubMedCrossRefGoogle Scholar
  7. Hackel, E. 1899. Enumeratio Graminum Japoniae. Bull. Herb. Boiss. ser. 1.7: 637–654.Google Scholar
  8. Hultén, E. 1968. Flora of Alaska and Neighboring Territories. Stanford Univ. Press, Stanford.Google Scholar
  9. Jones, K. 1956a. Species differentiation inagrostis I. Cytological relationships inAgrostis canina L. Jour. Genet.54: 370–376.CrossRefGoogle Scholar
  10. — 1956b. Species differentiation inAgrostis II. The significance of chromosome pairing in the tetraploid hybrids ofAgrostis canina subsp.montana Hartm.,A. tenuis Sibth. andA. stolonifera L. Jour. Genet.54: 377–399.Google Scholar
  11. Koyama, T. 1964. Gramineae.In: Kitamura, S. et al Coloured Illustrations of Herbaceous Plants of Japan, vol. 3: 301–388, Hoikusha, Osaka (in Japanese).Google Scholar
  12. Mayr, E. 1970. Populations, Species and Evolution. Harvard Univ. Press, Cambridge.Google Scholar
  13. Meusel, H., E. Jäger andE. Weinert. 1965. Vergleichende Chorologie der Zentraleuropäischen Flora. Fischer, Jena.Google Scholar
  14. Nygren, A. 1962. Artificial and natural hybridization in EuropeanCalamagrostis. Symb. Bot. Upsal.17(3): 1–105.Google Scholar
  15. Ohwi, J. 1933. Symbolae ad Floram Asiae Orientalis, 9. Acta. Phytotax. Geobot.2: 149–170.Google Scholar
  16. — 1941. The tribe Agrosteae of Japan, excluding the genusCalamagrostis. Bot. Mag. Tokyo55: 350–362.Google Scholar
  17. — 1965. Flora of Japan (2nd ed.). Shibundo, Tokyo (in Japanese).Google Scholar
  18. Probatova, N.S. 1973. Poacearum species novae et rariores ex Oriente Extremo. Novit. Syst. Pl. Vasc.10: 68–79.Google Scholar
  19. — 1974a. Gramineae.In: Vorobiev, al. Key for the Vascular Plants of Sakhalin and Kurile Islands. Acad. Science, USSR., Leningrad.Google Scholar
  20. — 1974b. Notae de Gramineis florae Orientis Extremi. Novit. Syst. Pl. Vasc.11: 57–69.Google Scholar
  21. Scholz, H. 1969. Novitates systematicae specieiAgrostis coarctata Ehrh ex Hoffm. Willdenowia5: 479–487.Google Scholar
  22. Snaydon, R.W. 1973. Ecological factors, genetic variation and speciation in palnts.In: Heywood, V.H. ed., Taxonomy and Ecology, p. 1–29. Academic Press, London.Google Scholar
  23. Sokolovskaya, A.P. 1938. A caryogeographical study of the genusAgrostis. Cytologia8: 452–467.Google Scholar
  24. -Sokolovskaya, A.P. and N.S. Probatova. Karyosystematic investigation of the Far Eastern species ofAgrostis L. Bot. Jour.59: 1278–1287.Google Scholar
  25. Stebbins, G.L. 1971. Chromosomal Evolution in Higher Plants. Edward Arnold Ltd., London.Google Scholar
  26. Tateoka, T. 1955. Karyotaxonomy in Poaceae. III. Further studies of somatic chromosomes. Cytologia20: 296–306.Google Scholar
  27. Tateoka, T. 1967. Gramineae.In: IOPB Chromosome Number Reports. Taxon16: 561–564.Google Scholar
  28. — 1969. On the morphological differences betweenAgrostis borealis andA. flaccida (Gramineae). Bull. Natn. Sci. Mus. Tokyo12: 637–642.Google Scholar
  29. — 1970. Cytotaxonomic studies of theAgrostis borealis complex (Gramineae). I. Populations in Mt. Chôkai, Mt. Gojizô and Mt. Karakuni. Bull. Natn. Sci. Mus. Tokyo13: 263–273.Google Scholar
  30. — 1971. Cytotaxonomic studies of theAgrostis borealis complex (Gramineae). II. Properties of the hexaploids. Bull. Natn. Sci. Mus. Tokyo14: 247–256.Google Scholar
  31. — 1972. Cytotaxonomic studies of theAgrostis borealis complex (Gramineae). III. The occurrence of spontaneous triploids. Bull. Natn Sci. Mus. Tokyo15: 455–460.Google Scholar
  32. Taylor, R.L. andG.A. Mulligan. 1968. Flora of the Queen Charlotte Islands. Part 2. Cytological Aspects of the Vascular Plants Queen's Printer, Ottawa.Google Scholar
  33. Tzvelev, N. 1964.Agrostis.In: Tolmatchev, A. ed., Flora Arctica URSS, Fas. II Gramineae. Nauka, Leningrad.Google Scholar
  34. — 1971. Notae de Gramineis florae URSS, 6. Novit Syst. Pl. Vasc.8: 57–83.Google Scholar
  35. Vovk, A.G. 1970. Chromosome numbers of the UkrainianAgrostis species and forms. Ukrajins'kij Bot. Žurnal27: 739–742.Google Scholar
  36. Widén, K.-G. 1971. The genusAgrostis L. in eastern Fennoscandia. Taxonomy and distribution. Flora Fennica5: 1–209.Google Scholar
  37. Zukova, P.G. 1967. Chromosome numbers in some species of plants of the north-eastern part of the USSR II. Bot. Žurnal52: 983–987.Google Scholar

Copyright information

© The Botanical Society of Japan 1975

Authors and Affiliations

  • Tuguo Tateoka
    • 1
  1. 1.Department of BotanyNational Science MuseumTokyo

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