01562nas a2200145 4500008004100000245004800041210004700089300001200136490000700148520112400155653005201279100001801331700001701349856005001366 1958 eng d00aBiosystematics of Triglochin maritimum agg.0 aBiosystematics of Triglochin maritimum agg a156-1650 v853 a

Chromosome numbers of the aggregate species Triglochin maritimum range from the diploid number 2n = 12 to the 24-ploid number 2n = 144. It is shown that the typical Linnaean species from northern Europe is octoploid with 2n = 48 chromosomes, and the same number is typical of the distinct species concinnum from the Pacific Coast of North America. Lower numbers are known from southern Europe, whereas the 20-ploid number has been determined from the Japanese taxon T. asiaticum here elevated to the species level. The segregate from the western plains of North America is shown to be a 16-ploid taxon which has been regarded as a variety of T. maritimum or T. concinnum by various authors; it is here raised to specific rank as T. debile. The eastern North American plant, which may be identical with some southern and western populations not yet studied cytologically, has 2n = 144 chromosomes and is found to be identical with the long ignored species T. elatum. The importance of exact identification and segregation of types differing in chromosome number for all exact geobotanical studies is emphasized.

10aTriglochin, juncaginaceae, Triglochin maritimum1 aLöve, Askell1 aLöve, Doris uhttps://juncaginaceae.myspecies.info/node/22101256nas a2200157 4500008004100000245005400041210005300095300001400148490000700162520080700169653001800976653002400994100001701018700001301035856005001048 1961 eng d00aTriglochin gaspense, a new species of arrow grass0 aTriglochin gaspense a new species of arrow grass a1261-12720 v393 a

A new species, Triglochin gaspense Lieth & D. Löve, is described from a salt marsh between Barachois-Ouest and Coin-du-Banc, Gaspé Peninsula, Quebec, Canada. It is distributed in Quebec, the Canadian Maritime Provinces, and Newfoundland, as well as in at least the northern part of the state of Maine, U.S.A. It is well differentiated from the other American species of the Triglochin maritimum complex, to which it belongs, morphologically (5-20 cm tall, leaves overtopping the short, few-flowered spike), cytologically (2n = 96 chromosomes), and ecologically (confined to the tidal zone of the Atlantic coast below the high-water mark). The type specimen of the new species is preserved in the Marie-Victoria Herbarium, Université of Montréal.

10aJuncaginaceae10aTriglochin gaspense1 aLöve, Doris1 aLieth, H uhttps://juncaginaceae.myspecies.info/node/228