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R Morgan del etlitVi. Potamogeton crassifblius. West.'Newman, imp Talo 299.
821 ON A NEW HYBRID POTAMOGETON OF THE FLUITANS GROUP. By Alfked Fkyer. (Plate 2Q9.) Potamogeton crassifolius milii = P. Zizii x P. natmis.— Rootstuck with thick stolons, rooting deeply in the soil ; stem 4-5 ft. long, very stout, round, simple below, branched above with simple branches ; leaves all stulked, corideeoits, opaque ivhen mature ; lower leaves reduced to submerged phyllodes, or narrowly lanceolate and tapering into the petiole, or with a distinct lanceolate lamina, all thick and coriaceous like the %(p}ier ones ; distant, few in number, usuallu all decayed by the time of jloweriny ; upper leaves very thick and fleshy, oblong-elliptical, or oval, with a i^ronnnent fold at the base of the lamina, which is slightly decurrent, or rarely lanceolate and gradually narrowed into the stalk; petiole flat above, slightly enlarged towards the apex, shorter than the lamina ; stipules not winged, not channelled on the back, but with two conspicuous green ribs, horny with scarious edges, or herbaceous, acute; lowest sometimes bearing a short phyllode, or more rarely a long lanceolate ordinary lower leaf ; peduncles of equal thickness throuyhout, terminal becoming lateral by growth of the branch, equalling or slightly exceeding the stem in thickness, 2-3 times as long as the Hower- spike, much shorter than the subtending leaves ; flower-spike cylindrical, dense, 1-1:^ in. long, usually (always?) barren, perianth-leaves closed at the time of flowering, but the stigmas exserted ; colour of the whole plant briykt yreen, or with the young upper leaves sometimes reJdish or streaked with reddish purple. Potamoyeton crassifolius differs in its parentage from P. jluitans Roth, l)eing a hybrid between forms of P. Zizii and /'. nutans, instead of between P. luccns and P. nutans. It varies slightly from the type described above, because in different localities it originates from different forms of [\ Zizii, and because the seed-parent is sometimes Zizii and sometimes natuns. The type of the species (figured PL 299) is a very robust plant, growing in deep water, and, altliough springing from a single rootstock, spreading along the water for a distance of 10 or 12 yards. In habit and general appearance it closely resembles a large form of P. Zizii [P. cori((ceus V. major mihi), which grows in the same drain intermixed with /'. niitaus, and probably it is coriureus J x natuns 3- . The upper floating-loaves of corinceus v. major and crassifolius so closely resemble one another in some specimens that the plants are with difficulty separable, except by examination of the widely different lower leaves. In the Rlepal Engine Drain, where three separate stations have been found, /'. crussilolius is always accompanied by P. Zizii, and I have met witli it in no locality where that species does not exist. In anotlier locality,—at Westmoor, in the parish of Doddujgton,—some miles distant from tlie Mcpal station, no doubt ab(jut its parentage is possible, as only P. Zizii and I', nutans are Journal of Botany.—Vol. 28. [November, 1890.] y
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^r»i^/ -•-JP, i>J> > > > 'jr J.
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J i(( THE ) JOURNAL OF BOTANY BEITI
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C. C. Babington, M.A., F.R.S. J. E.
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sydnev Parkinson dd. 1 .Tri-umfetta
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2 EPILOBIUM NOTES FOR 1880. Cocos I
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4 EPILOBIUM NOTES FOR 1889. allegat
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6 EPILOBIUM NOTES FOK 1880. It seem
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8 EPILOBIUM NOTES FOR 1889. within
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10 MARINE ALG.E OF THE ARBROATH DIS
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12 MARINE ALO.E OF THE ARBROATH DIS
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14 MARINE ALG.E OF THE ARBROATH DIS
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16 SYNOPSIS OF GENERA AND SPECIES O
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18 CYPERUS JEMINICUS ROTTB. An annu
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20 BIOGRAPHICAL INDEX OF BRITISH AN
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22 SHORT NOTES. 16G0. Master of Mec
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24 HANDBOOK OF THE BROMELIACEi^. pu
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26 HANDBOOK OF TIfE BROMELIACE^. wh
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28 NAMES AND SYNONYMS OF BRITISH PL
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30 MANUAL OF ORCHIDACEOUS PLANTS. i
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32 LINNEAN SOCIETY OF LONDON. Oeste
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Gr.Massee del. R.Morgajilith. Podau
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34 A MONOGRAPH OF THE GENUS PODAXIS
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86 A MONOGRAPH OF THE GENUS PODAXIS
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38 A MONOGRAPH OP THE GENUS PODAXIS
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40 NOTES ON SCOTCH PLANTS. prevente
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42 NOTES ON SCOTCH PLANTS. umhrosa
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44 NOTES ON SCOTCH PLANTS. Tofieldi
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48 ON FKSTUOA HETEROPHYLLA. quality
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50 ON FESTUCA HETEEOPHYLLA. (( Char
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52 BIOGRAPHICAL INDEX OF BRITISH AN
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54 BIOGRAPHICAL, INDEX OP BRITISH A
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56 BIOGRAMICAL INDEX OF BRITISH AND
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t^ La Bl'oLOGIE V^GETALE. lucidity
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60 ATLAS DEUTSOHER MEERESALGEN. do
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62 ATLAS DEUTSCHKR MEERESALGEN. of
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64 LINNEAN SOCIETY OF LONDON. vulga
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05 NOTES ON THE BRITISH CHARACEJE F
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XOTES ON TIIK BRITISH CHARACE.T: FO
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A MONOGRAPH OF THE GENUS PODAXIS DE
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A JIOXOGEAPH OF THE GENUS PODAXIS D
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FURTHER RECORDS FROM ICELAND. 79 Ba
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FURTHER RECORDS FROM ICELAND. 81 dn
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PUETHER BECOBDS FROM ICELAND. 88 JE
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BENJAMIN CLAEKE, F.L.S. 85 (lateral
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PLANTS FOUND NEAK KILMANOCK, CO. WE
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BIOGRAPHICAL INDEX OF BRITISH AND I
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SHORT NOTES. 91 Univ., Dublin, 1845
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FLORA OF SUFFOLK. 93 hence notice o
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AKTICLES IN JOURNALS. 95 des Bering
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97 NOTES ON ENGLISH RUBI. By W. 0.
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VASCULAR CRYPTOGAMIA 01' NEW GUINEA
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VASCULAR CRYPTOGAMIA OF NEW GUINEA.
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VASCULAK CRYPTOGAMIA OF NKW GUINEA.
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VASCULAR CRYPTOGAMIA OF NEW GUINEA.
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PLANTS 1-UI:ND IN KEIIRY. Ill Jitnc
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PLANTS FOUND IN KERRY. 118 C. praco
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PLANTS FOUND IN KERRY. 115 Reeks ;
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BIOGEAPHICAL INDEX OF BRITISH AND I
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BIOGEAPHICAL INDEX OF BRITISH AND I
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SCIENTIFIC PAPERS OF ASA GRAY. 121
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ARTICLES IN JOURNALS; 123 Wilson's
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LIKNEAN SOCIETY OF LONDON. 125 perf
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LINNEAX SOCIETY OF LONDON. 127 spac
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NOTES ON EN(iUSH KUHI. 133 8G. R. M
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THE GENUS SCAPHOSEPALUM PFITZER. 13
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NOTKS ON PONDWEEDS. 137 G. S. PULVi
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SYNOPSIS OF OENRUA AST) SPKCIKS OF
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SYNOPSIS OF GENERA AND SPECIES OF M
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A NEW LASTREA FROM ASSAM. 145 petal
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BiOGEAPHICAL INDEX OF BRITISH AND I
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157 SHOKT NOTES. Lejeunea Rossettia
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R.Morgan lith. X 8 ^^^'- l-S-Cantha
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170 ABERDEEN, FOEFAE, AND DUMFRIES
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172 CAREX RIGIDA AND ITS VARIETIES.
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174 SUPPOSED HYBEIDITY IN POTAMOGET
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176 SUPPOSED HYBRIDITY IN POTAMOGET
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190 NOTICES OF BOOKS. Physiology. A
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192 LINNEAN SOCIETY OF LONDON. Flor
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194 SYNOPSIS OF THE GENUS TUNICA. c
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196 ' SYNOPSIS OF THE GENUS TUNICA.
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198 SYNOPSIS OF THE GENUS TUNICA. p
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200 HEPATIC.E FOUND IN KERRY, 1889.
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202 HEPATIC.E FOUND IN KERRY, 1889.
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204 EUBUS EEYTHRINUS. It may be wel
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206 KUBUS ERYTIIRINUS. There are fe
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208 SYNOPSIS OF GENERA AND SPECIES
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222 LINNEAN SOCIETY OF LONDON, nov.
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224 LINNEAN SOCIETY OF LONDON. tion
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234 ON SPAUGANIUM. Bhclmum spicant
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238 ADDITIONS TO THE IRISH MOSS FLO
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244 BIOGRAPHICAL INDEX OF RRITISH A
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257 ON SOME RUSTS AND MILDEWS IX IN
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ON SOME BUSTS AND MILDEWS IN INDIA.
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ON SOME RUSTS AND MILDEWS IN INDIA.
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TONQUIN FERNS. 263 li-2 ft. loDg, 4
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TONQUIN FERNS. 2G5 broad. Veins pin
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36, 100, 101, 1872. G. elliptica Ba
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CAMPANL'LARUM NOVAKUM DEGAS I'lU.MA
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CAMPANULAKUM iNOVAKU.U DECAS i'Klil
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Page 301 and 302: BIOGRAPHICAL INDEX OF BRITISH AND I
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Page 305 and 306: 283 REPORT OF THE DEPARTMENT OF BOT
Page 307 and 308: HANDBOOK OF THE FLORA OF EXTRA-TROP
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Page 320 and 321: 296 BUDA V. TISSA. ment of Science,
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Page 326 and 327: 302 SPERGULA PENTANDRA IN IRELAND ?
Page 328 and 329: 301 THE FERTILISATION OF THE SUGAR-
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Page 355 and 356: IN MEMORY OF MARIANNE NORTH. 829 Pt
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370 SYNOPSIS OF GENERA AND SPEOIES
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372 PRIOBITY OF PLACE IN BOTANICAL
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874 BIOGRAPHICAL INDEX OF BRITISH A
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376 SHORT NOTES. Flora,' 1877 ; col
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878 THE LEJEUNE^ OF LINDENBEKg's HE
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380 ARTIFICIAL KEYS TO THE GExNERA
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882 OBITUARY. of Harvey's ' Phycolo
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384 EDITOEIAL. now nearly completed
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386 INDEX. P, fluitans, 248 ; Poten
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388 INDEX. Jackson, J. K., Hartig's
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390 INDEX. Staurastrmu glabrnm, 337
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Just Published, Price 5s. 4d. HANDL
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A MESSRS. BELL'S LIST OF BOOKS. Jus
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PRINGLE'S PLANT>E MEXICAN/E (Fifth
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A MESSRS. BELL'S LIST OF BOOKS. Dem
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' O CIENCE AND SCIENTISTS : some Pa
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BOTANICAL DRYING PAPER FOE DKYING F
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A MESSRS. BELL'S LIST OF BOOKS. ' D
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NOTICE. The JOURNAL OF BOTANY is pr
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NOTICE. The JOUENAL OF BOTANY is pr
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NOTICE. The JOURNAL OF BOTANY is pr
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MESSRS. BELL'S LIST OF BOOKS. WORKS
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NOTICE. The JOUENAL OF BOTANY is pr
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A MESSRS. BELL'S LIST OF BOOKS. WOR
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' NOTICE. The JOUENAL OF BOTANY is
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Recently Completed, iviiJi 1987 Ful
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NOTICE. The JOUKNAL OF BOTANY is pr
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t\ V^^ V^ c; ' c' c < ^ ^
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