. Critical researches on the potamogetons. 218 J. O. HAGSTEOM, CRITICAL RESEARCHES ON THE POTAMOGBTONS. With the same right as for instance the name of P. nitens Weber is used of all the forms of the hybrid P. gramineiis X â perfoliatus, the name of P. sparganifolius of L^STADius ought also to be applied to the hybrid here concerned, as the description as well as all specimens delivered by L^stauius must be referred to it. Cfr also S. Almquist, on P. sparganifolius in Bot. Not., 1891, 129! The Richterian name is certainly attributed to the hybrid gramin. X nutans as its particular name, but th
. Critical researches on the potamogetons. 218 J. O. HAGSTEOM, CRITICAL RESEARCHES ON THE POTAMOGBTONS. With the same right as for instance the name of P. nitens Weber is used of all the forms of the hybrid P. gramineiis X â perfoliatus, the name of P. sparganifolius of L^STADius ought also to be applied to the hybrid here concerned, as the description as well as all specimens delivered by L^stauius must be referred to it. Cfr also S. Almquist, on P. sparganifolius in Bot. Not., 1891, 129! The Richterian name is certainly attributed to the hybrid gramin. X nutans as its particular name, but this, I think, can nowise dis- place the right of priority being due to the Lsestadian name. As mainform, f. typicus, I therefore regard the Lapland form and the crosses from North Europe congruent to it, usually with elong- ated stem, often extremely long and very narrow submersed leaves, and nearly always narrowly lan- ceolate or long-lanceolate floating leaves. The other crosses are by AscHERSON and Graebner di- stributed on the varr. pergrami- neus: »untergetauchte Blatter sehr lang und schmal linealisch» and pernatans: those leaves »kiirzer und breiter, lanz.âlangl. lanz.» It would thus be the var. pergranii- neus which resembles P. nutans, and the v. pernatans Avhich is like P. gramineiis. Cfr S. Almquist in Hartman, Skand. FL, ed. 12, 1889, 48! To those Kupfeer adds a f. intermed'kis, which in habit is said to stand about half- way between the two parents: »halt im Aussehen ziemlich gut die Mitte zwischen den Eltern». In all its forms P. sparganifolius is best distinguished from P. lucens x natans by its upper leaves, being less conspicuously and not so sharply cuspidate and, be- sides, longer stalked (petioles usually longer than the laminae). Cf. the figs. 104 and 121! The form typicus has the base of those subcoriaceous leaves usually sloping; the more south forms are usually more richly endowed with floating leaves, which have rounded or subcordate
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