Myrioj)JiijUi(m.'] XLV. halorage.^. 487 



Leaves all iu whorls of 3 to 8, the submerged ones pinnatisect with 

 capillary segments, the emerged floral ones entire toothed or 

 shortly lobed. 

 Leaves usually more than 4 in the whorl, the emerged ones nar- 

 row-linear. Calyx-lobes conspicuous 1. J/. vanafoIi?im. 



Leaves usually 4, the emerged ones oblong or broadly lanceolate, 

 sessile. Calyx-lobes minute. 

 Emerged leaves entire or slightly toothed. Plant rather large 2. 3L elai'moides. 

 Emerged leaves piinialifid. Plant small or slender .... 3. if. verrucosunu 

 Leaves usually 3, the emerged ones linear-lauceolate, above \ iu. 



long, serrulate, narrowed into a petiole . 4. Af, latifolium. 



Leaves all opposite or rarely in whorls of 3, pinnatisect with capil- 

 lary lobes. Male flowers 1 or 2 together on a distinct peduncle, ^ ^ 



each enclosed in a hood-shaped bract 5. 3f. MuellerL 



Leaves all opposite, entire. Small plants cree])iug iu mud. 



Leaves oblong. Carpels smooth ; . . 6. J/, amphibium. 



Leaves linear. Carpels tuberculate or muricate .;..,, 7- J^- yeditnculatum. 

 Leaves all alternate. 

 Submerged leaves pinnatisect with capillary segments. Sta- 

 mens 8. 



Emerged floral leaves entire, linear. 



Carpels 2, smooth ..•-.. ^ .• 8, 3f. dicoccim. 



Carpels 4, tuberculate . . • , i 9. if. ir achy car j)um. 



Leaves all pinnatisect with fine segments. Carpels 4 , . ,10. 3L gracile. 

 Leaves all linear and entire, or rarely with a few lobes ia 3/. 



Drnmmondii. Minute filiform plants. 

 Stamens 8, with oblong anthers loujier than the filaments . . 11. M.filiforme, 

 Stamens 4 or fewer, with ovate anthers much shorter thaa the 



filaments. . , -.^ ir • j v r- 



Leaves all entire. Carpels smooth ..,,... . \2, M. tntegnfohim. . 



Leaves occasionally with a few lobes. Carpels muricate . 13. M. Dnimmonan. 



1. M. varisefolium, HooL / m ffooL Ic. PL /. 289, and K Tarn. 



L 123. Usually a rather large species, the erect flowering sianmits assuming 

 almost the aspect of IHppurU. Leaves in whorls of from 4 to 8, usually 5 

 «!' 6, the lower submerged oues divided into capillary lobes, the emerged floral 

 ones narrow-linear, all entire or tlie lower ones toothed, \ to above s m. long, 

 ^lale fl. : Calyx-lobes conspicuous and sometimes above | line long. Petals 

 H to \\ lines. Stamens 8, Female fl. small without apparent calyx-teeth 

 or petals. Carpels 4, Small, tuberculate or almost echiuate, or rarely qiute 

 smooth. 



W. S. Wales. Port Jackson, B. Brown, Woolh ; Lachlan river, A, Cunningham; 

 Glendon and Newcastle, Leiclihardi ; Hastings nver, BecMer ^ 7>^i...,^„ 



Victoria. Swan.i4 Tortlaud, F, Mueller; Glenelg and Wendu n^^^' J^*/'^^^^^- 

 Tasmania, Abnndant in fresli waters througliout the colony, J. D, Hooker. 



S. Australia. Torrens river, F. Mueller. j ^ 4 n n A4h r..ii ' 



W. Australia. Swan River to King George's Sound, Brumnond, \d ColL, Wi Coll. 



*• 75, Rarvei/, Oldfeld, 

 Also in New Zealand. 



A rather large species. 



Leaves in whorls of 4 Jr rarely 5 or 6, the lower submerged ones divided 

 ^nto capillary lobes, the emerged floral oues bro.dly anceolate obtuse entire 

 or scm-cely toothed quite sessile. \ to nearly \ m. long^ Male fl. : Calyx- 

 ^eeth scarcely perceptible. Petals about 1 Ime long. Stamens 8. Pcmale 



