. Critical researches on the potamogetons. KUNGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 55. N:0 5. 25 L. (probably to the Museum of St. Petersburg) and Macottn's Catalogue Canad. Plants 1888 records it from Buffalo Lake, lat. 56°. It is thus testified, that P. va- ginatus, or a form of it, occurs in Canada (see under P. vagin.). P. filiformis also is growing there, and the Winipeg-plant really has much, that reminds of the two species: stem rather thick but the ramification as in P. filiformis; leaves narrow, blunt, greyish-green; sheaths short, 15—20 mm, but rather dark and of strong struc- tu
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. Critical researches on the potamogetons. KUNGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 55. N:0 5. 25 L. (probably to the Museum of St. Petersburg) and Macottn's Catalogue Canad. Plants 1888 records it from Buffalo Lake, lat. 56°. It is thus testified, that P. va- ginatus, or a form of it, occurs in Canada (see under P. vagin.). P. filiformis also is growing there, and the Winipeg-plant really has much, that reminds of the two species: stem rather thick but the ramification as in P. filiformis; leaves narrow, blunt, greyish-green; sheaths short, 15—20 mm, but rather dark and of strong struc- ture, ligules persistent, even in the basal sheaths; peduncle short (— 60 mm) as in P. vaginatus with almost overtopping leaves; spike of 4—6 approximate verticils. This form should be called f. brevipes n. f.: ped. brev. — Another form, coll. by Low at Fort Chimo, Labrador (hb. Haun.), with very long leaves and peduncles, I would name f. longipes n. f.: ped. longiss.. P. pamiriciis Baagoe. Potamogetonacese from Asia-media in Vidensk. Medd. fra den naturhist. Forening. Kjobenhavn 1903, 182. — Fig. 6. In his dissertation (p. 183) Baagoe has mixed up two different species. The same is the case with his assigning of names in the Mu- seums of Lund and Copenhagen. The plant, gathered by 0. Paulsen in Pamir and named P. pamiricus is quite another than that collected by RoBO- ROWSKY in Kuen-Luen. This one has been found to be a beautiful, distinct, new species separated from P. pamiricus, which is very nearly allied to P. filiformis and scarcely specifically separated from it. The description of Baagoe meanwhile refers to Paulsen's plant from Pamir and the name pamiricus consequently is to be kept for this form. A plant from Thibet (hb. Lund, et Haun.), gathered by T. Thomson and determined by Baagoe, pretty well corresponds to the description except a couple of measure-notes. Stem about 0, 5 m high, the basal ^'^b^;.„^/7"T internodes also elongated (4—8 cm); leaves a