NAIADACE/E 197 



common on the Riviera) and differs chiefly by the longer interruption between 

 the spike of male and female flowers, and by the narrower and stiffer leaves. 

 Ditches and pools, fairly common. May-July. 



T. minima Hoppe. has recently been found on the Sables du Verdon (Var). 

 SPARGANIUM L. 



S. ramosum Hiuis. Branched Bur-reed. A very stout, erect, water- 

 plant. Stems simple or branched, 2-3 ft. high, sheathed below by long linear 

 leaves, triquetrous at base, usually much longer than the flowering spike. Male 

 heads olive-brown, deciduous ; female heads an inch across when in fruit ; all 

 disposed in a sort of leafy panicle. Bracts linear. 



Ditches, streams, and other wet places. May-July. 







ARACE^. 

 Spathe divided to the base ; cornet-shaped ARUM. 



Spathe tubular at the base ; hooded above AKISARUM. 



r 



ARUM L. 



A. italicum Mill. Leaves radical, very large, and long petioled, hastate- 

 sagittate with divaricate acute auricles, usually spotted with pale yellow. 

 Spathe very large, sometimes a foot long, greenish-white or yellowish, spike or 

 spadix same colour as the spathe. Berries red. 



Hedges, fields, road-sides, and damp places, common on the littoral. April- 

 May. 



A. maculatum L. The common " Lords and Ladies " of England is rare 

 in the Mediterranean region and found only occasionally in mountain woods. 

 April-May. 



A. Dracunculus L. This handsome species, 3 ft. high or more, with very 

 spotted stem and much-divided leaves, is naturalized in places in the Var, as e.g. 

 at Fenouillet. May-June. 



ARISARUM Targ. Tozz. 



A. vulgare Targ. To^. = Arum Arisarum L. (Plate XXVIII). A small, 

 spotted-stemmed Arum with long-petioled, radical leaves with cordate base, or 

 often with base extended into obtuse auricles. Spathe livid brown or greenish, 

 streaked with purple, hood-shaped above, and acuminate ; spadix slender, green- 

 ish, bent forward, and prominent. Flowers monoecious. Fruit green, truncate- 

 hemispheric, in heads an inch in diameter, each capsule having from 2-10 seeds. 



Stony places, under walls, hedges, etc., very common. November- April. 



LEMNACE^E. 

 LEMNA L. DUCK-WEED. 



L. minor, L. trisulca, L. gibba, and L,. polyrrhiza are found in stag- 

 nant water. 



NAIADACE^E. 



Tribe I. JUNCAGINE^. Erect marsh herbs with rush-like leaves. Flowers 

 1-2 sexual. Stamens 6. Carpels 3 or more ; ovules basilar erect. Embryo 

 straight. (Now usually given family rank.) 

 Flowers ebracteate. Anthers subsessile, short TRIGLOCHIN. 



Tribe II. POTAME^E. Aquatic herbs. Flowers spiked, 2-sexual. Stamens 

 2 or 4. Carpels 4. Ovules solitary. Embryo curved. 



Perianth segments 4. Achenes sessile POTAMOGKTON. 



Perianth o. Achenes stipitate ....RUPPIA. 



Tribe III. ZANNICHELLIE^). Aquatic herbs. Flowers axillary, i-sexual. 

 Stamen i, carpels 2-9. Ovules solitary. Perianth o ZANNICHELLIA 



