KUNGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 55- N:0 5. 



227 



f. robustior TiSELiuS in herb 

 75—80x10—17 mm; spicse vulgo 



f, vadosus Tis., 1. c. n:o 43: 



f. fyrisensis TiS., 1. c. n:o 

 40, — Folia caul. subm. ca. 50 

 — 65 X 10— 14 mm. Forma transi- 

 toria inter (3 et t. 



f. gotlandicus n. f. — Folia 

 caul. subm. breviora basi cordata, 

 30— 35X 11—13 mm. 



f. spicosus n. f. — Folia 

 caul. subm. elongata, 100- — ^150 

 X 15 — 18 mm, basi anguste 

 cordato-rotundata, superiora ssepe 

 subcoriacea; ligulfe valde caducse. 



As regards the leaf -size this 

 form is like f. prcelongifolius (Tis.) 

 Hagstr. as well as P. gramineus 

 f. septentrionalis (Tis.) Hagstr. 

 From the former it differs by 

 the narrower leaf-base and more 



gramineus-like (subcoriaceous) 

 upper leaves ; from the latter by 

 the extremely fugacious ligules 

 and a little broader leaf-base, 

 besides which the peduncles also 

 are shorter and the spikes small, 

 always sterile. 



f. neidensis n. f. — Folia 

 caul, late lanceolata, 80 X 22 mm. 

 LigulcB ± persistentes, 20 — 25 

 mm longse. 



Distribution. P. nitens 

 associates with the parent-species 

 from Switzerland and France 

 up to the highest North, and 

 not beyond their distribution 

 area; in Europe as well as in 

 N. America; rare to the south, 

 northward, where the parents are 

 where the originators are sm all- 

 in the north and in rivers (f. 

 appears as f. septentrionalis, or f. 



Stockholm, (nomen): — Folia caul. subm. majora 

 ut in prsecedente. 

 — Folia caul. subm. ca. 50 X 15 mm. 



Fig. 108. P. nitens Web. -f snhhileynieflius Hagstr. A, Habii-picture 

 sliowing the primary and secondary involucral leaves, -{, a, primary spilio. 

 B — /r, submersed stem-leaves, -J, /*, f. ti/picits (Tis.) Hagstk., C, m<elarensis 

 Tis., D, siihsiiiiilis Tis., E, hitermedius (Tis ) Hagstk., F, robustior Tis., G, 

 fyrisrnsis Tis., H, gotlandictts Hagstk., K, spicosits Hagstr. 



where P. gramineus also is rare, more common 



common; with small-leaved forms (f. typicus etc.), 



•leaved, and with larger, more elongated leaves 



Lcestadii, prwlongifolitis etc.), Avhere P. gramineus 



Wolfgangii, and P. perfoliatus as f. longifolius etc. 



