

KUNGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 55. NIO 5. 21 



brevibus, superne 10—15 mm, inferne 20 mm viridiusculis ; pedunculus elongatus; 

 spica 2—4 (o)-verticillata parviflora. 



This form is extremely like P. pectinatus f. laxus Tis. It has been collected 

 by D:r G. Tiselius at Stockholm 1896 (hb. Upsal.) and by him looked upon as a 

 »f. laxus». 



2. f. gevaliensis n. f. — Longitudo foliorum et structura, color vaginarum, 

 stylus et stigma ut in P. filiformi; pedunculus autem brevior, spica 4— 5-verticillata, 

 verticillis aproximatis ; sterilis. 



Habitat: Siveden, Gefle, in a ditch, 1818 (hb. Stockholm.), Gefle ballast-quay, 

 87, Zetterström (hb. Stockholm., Uppsal., Lund.). 



p. Intermedius Hagstr. 



3. f. Hartmanii n. f. — Caulis 25 — 40 cm altus badeo-viridis, inferne cras- 

 siusculus. Folia ± angusta, 5 — 10 cm longa, vaginis brevibus, superioribus 15—20 

 mm, inferioribus 20 — 30 mm ssepe crassiusculis ut in P. pecti?iato, fuscoviridibus 

 vel ± albido-marginatis prsesertim inferioribus. Spica vulgo 4— 5-verticillata, sem- 

 per sterilis. 



Distribution. Sweden, Gestrikland, Gefle, Orarne, 35, hb. Hn. (hb. Uppsal.), 

 Iggö, 97, Arnell (hb. Uppsal.). — Uppland, Länna, Furusund, 96, Tiselius (hb. 

 Stockholm., Uppsal., Lund., Gotenb.) is n. 119 in Tisel., Pot. suec. exs. III; Norr- 

 telje, H. & D. Tiselius (hb. Uppsal.), n. 119 in d:o. — Sudermania, Österhaninge 

 Gålön, 87, Almquist (hb. Stockholm, the plant mentioned in Almqu. Bot. Not. 

 1889), 90, Ribbing (hb. Uppsal.), Järna, Ängsholmen, 81, 82, Sanden (hb. Uppsal., 

 Lund.), Hallsfjärden, 93, Hagström (hb. Stockholm.). — Ostrogothia Jonsberg, in 

 several places (Ölskär, Yttre Högskär, Gubbholmen) coll. Elmquist, Stenhammar, 

 Hammarsten (Lönö) (hb. Stockholm., Uppsal., Lund.). — Smoland, Lofta, Lerbo- 

 holms sufferance-wharf (hb. Stockholm.) on the same page as P. filif. and pectin., 

 evidently collected at the same time; Västervik, 63, Holmström & Lyttkens (hb. 

 Lund.). — Öland, Björnudden, 83, Nordstedt (hb. Lund.). — Gotliland, Kapell- 

 hamn. — Denmark, Susa, 99, Baagöe (hb. Stockholm.), more slender and elongated 

 (river-form). 



4. f. abundans n. f. — Caulis altus ramosior; folia longa, vaginis longis. 

 Distribution. Sweden, Ostrogothia, Jonsberg, Yttre Högskär, 80, Elmquist 



(hb. Lund.). — Iceland, Laxå, Husavik, 99, Gudjonson (hb. Stockholm.); Myvatn, 

 76, Grönlund (hb. Uppsal.). On the same page a specimen of P. filif ormis f. 

 major Tis. and one specimen of P. pectinatus L., apparently collected at the same 

 place and parents to the hybrid plant. N. Amer., Sault Ste Marie, Mich. 81, Hill 

 (hb. Haun.). 



-{. Cuspidatus Hagstr. 



5. f. ysanensis n. f. — Caulis tenuissimus, internodiis elongatis; folia angus- 

 tissima, pulchre cuspidata, vaginis fuscis, brevibus; stylus ut in P. pectinato. 



