KUNGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 55- NIO 5- 



227 



f. robustior Tiselius in herb. 

 75—80x10—17 mm; spicae 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 p et y- 



f. gotlandicus n. f. — Folia 

 caul. subm. breviora basi cordata, 

 30— 35 X 11—13 mm. 



f. spicosus n. f. — Folia 

 caul. subm. elongata, 100 — 150 

 X 15 — 18 mm, basi anguste 

 cordato-rotundata, superiora ssepe 

 subcoriacea; ligulae valde caducae. 



As regards the leaf-size this 

 form is like f. prcelon.gif olius (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 extrem ely fugacious lignles 

 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 longae. 



Distribution. P. nitens 

 associates with the parent-species 

 from Switzerland and France 

 up to the highest North, and 

 not beyond their distribution 

 area; in Europé as well as in 

 N. America; rare to the south, 

 northward, where the parents are 

 where the originators are small 

 in the north and in rivers (f. 

 appears as f. septentrionalis, or f. 



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

 ut in praecedente. 

 — Folia caul. subm. ca. 50 X 15 mm. 



Fig. 108. /'. nitens Web. y subinlermedius Hagstr. A, Habit-picture 

 showing the primaiy and secondary involucral leaves, {, a, primary spike. 

 B — K, submersed steni-leaves, }, ]i, f. typicus (Tis.) Hagstr., C, mcelarensis 

 Tis., D, subsi milis Tis., E, intermedius (Tis) Hagstr., F, robustior Tis., G, 

 fyrisensis Tis., H, gotlandicus Hagstr., K, spicosus Hagstr. 



where P. gramineus also is rare, more common 



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



•leaved, and with larger, more elongated leaves 



Lcestadii, prcelongif olius etc), where P. gramineus 



Wolfgangii, and P. perjoliatus as f. longif olius etc. 



