Victorian Plants. 



SPARGANItrm. 



1870. Inflorescence branchless or scantily branched. 



Generally riparian, rather dwarf or somewhat tall ; leaves 

 broad-linear, keeled, the lower much elongated, the floral 

 leaves gradually more abbreviated ; headlets several or 

 many, sessile, rather distant along the flexuous upper 

 portion of the stem ; stamens three or more, surpassing 

 the sepals and petals ; anthers many times shorter than 

 the filaments; stigma unilateral, elliptical- or linear- 

 lanceolar, occasionally doubled ; fruits small, globular- or 

 ellipsoid -obovate, pointed by the persistent style. 



S. angustifolium. 



X. E M W A C E A E . 



1871. Root-fibre one only ...... ... 1872 



Root-fibres two or more ... ... ... ... 1873 



1872. Fronds almost lanceolar, submerged. 



Fronds quite small, membranous, transparent, finally 

 stalked, slightly serrulated towards the upper end, often 

 crosslike-coherent through new shoots, and occasionally 

 connected into extensive masses ; fruit one-seeded. 



L. trisulca. 

 Fronds from elliptic to ovate, floating. 



Fronds minute, firm, almost flat ; shoots sessile, soon de- 

 tached; fruit one-seeded. "Duck-weed." L. minor. 



1873. Root-fibres two or few. 



Fronds floating, very small, from elliptic to ovate, slightly 

 convex underneath ; shoots sessile, soon detached ; fruit 

 unknown. L. oligorrhiza. 



Root-fibres several. 



Fronds floating, firm, comparatively conspicuous, roundish- 

 ovate, somewhat convex on both sides, purplish under- 

 neath ; shoots sessile, soon detached ; fruit imperfectly 

 known, two-seeded. L. polyrrhiza. 



WOX.FFXA. 



1874. Fronds extremely minute, but very convex underneath. 



Increasing readily by offshoots ; fronds rather solid, sonorous 

 when touched in masses ; anther sessile ; fruit one-seeded. 



W. Michelii. 



