364 94. P0,TAM0GBTONACE^. 



long, about equallmg the peduncles. Mr. W. Wilson found 

 " ovate-lanceolate moderately acute - coriaceous 1." When the ' 

 limb of the 1. is much reduced' in size' and the midrib prominent 

 and resembling a long spinfe, it is the P. aouminatu& Schutn. — 

 Ootnmon in deepish water. P. VI. E. S. I. 



10. ? P. decip'iens](Nplte); I. pellucid |0&&!»?^ rounded beloic not 

 hooded but blunt and mucronate at. the end.mtire all sessile, stip. 

 not winged, fr. "like that of P. htcews" ped. falling short of 1. 

 equal.^iSfecOT. J. of JB. v. t. 61. . iJ. vii. 35. — St. long, .much 

 branched. Ped. 1 — 2 in. long, thicker ,thap the stem. Spikes 

 1 — 2 in. long, dense, — Canal near Batli,. P. VII. ; E.! 



11. P. hngifdlius (Gay ?) ; I. pellueid7o»^-tece6toe narrowed 

 below entire cuspidate, stip. winged, fr. ...... ped, hng swelling 



upwards, spikes with fewratherwhorleddistantflowers.^—^. B. 8. 

 2847. P. salidfolius Wolfg. ? — St. long, slender. L. distant,' 

 not denticulate, nearly sessile with very short stallfs. Stip. 

 green, lanceolate, with 2 narrow wings on the back. Ped; 6 — 8 

 in. long, much thicker than the stem. Spike 1 in. long; fl. rather 

 more'whorled than as represented in Ti. B. 8. Fr. unknown. — 

 Deep water. Lough Oolrib, Galway. P. VIII. ' I. 



12. P. prtdon'gus (Wulf.) ; I. pellucid oblong-lanceolate half- 

 clasping blunt and hooded at the end entire, stip. not mnged,fr. 

 rounded (rarely keeled) on the back when fresh keeled or winged 

 when dry, peduncle very long equal, spikes many-il6wered. — 

 E. B. 8. 2858. R. vii. 38. — St. long, grpvring in deep water.' 

 Peduncles 6 — 12 in. long. Spikes 1 — 2 in. long.^Rivers and 

 ditches,- rare. P. V.VI. . < E.S.I. 



13. P. perfolidtus (L.) ; st. rmmdj.l. pellucid cordate-ovate 

 clasping not hooded; fr. rounded on the back when fresh keeled 

 when dry, peduncle equal. — E. B. 168. ,-ffi. vii. 29.^St. -long, 

 slightly branched. Peduticles rather thick and short. Spikes 

 short.:-^Lakes and streams. P. VII.. E. S. I.' 



14. P. cm ^js (L ) ; st. compressed, I. pellucid, feear-oj/orei/, 

 blunt sessile serrate wavy, fr. tmih a long beak keeled on the 

 back when dry, peduncle equal. — E. B. 1012. P. vii. 29 — 80. 

 — St. much branched. Ped. long. Spikes few-flowered. Beak 

 as long as the nut. L, usually crisped at the edges, ocoasionallv 

 flat (P. serratus Huds.). — Ditches and streams. P. VI. E. S. I. 



*** L. all submersed, Qilternaiej linear; stipules free.\ 



15. P. sosterifdlius (Schuin.) ; st. flattened, I. linear-acimai- 

 nate WiiiA 8 ^n'«c8})a^ an (^ ma«?/ close parallel intermediate veitis 

 •occupying the whole Buiface, spffies cylindrical iipon long ped., 

 .Sep. transversely ovalj fr.' obovate keeled, style "terminal. — 



