ii6 THE FLORA OF THE ALPS 



Carpathians, Erzgebirge. 5. arenariu7}i^ S. and K.; flowers 

 large, petals nearly white, three times as long as calyx- 

 teeth, fringed, rosette-leaves lanceolate; Tirol, Carinthia, 

 Salzburg. 5. Neilreichi^ S. and K.; petals with narrow 

 winged serrated keel, fringed, leaves narrowly lanceolate; 

 Lower Austria. 5. Hildebrandtii, Schott ; keel of petals 

 torn into shreds, leaves lanceolate ; Styria. 



4. Umbilicus, DC. 



Calyx 5-cleft; corolla gamopetalous, 5-cleft; stamens 

 10, attached to the corolla. 



U. sedoides, DC; flowers pink, corolla twice as long as 

 calyx, plant tinged with red ; rocks ; Pyrenees. 



Order XXXUL— HALORAGEiE. 



Flowers minute and often unisexual; petals often o; 

 stamens 1-8; ovary inferior; fruit various. A small 

 order of mostly aquatic plants, generally distributed. 



I. HiPPURIS, L. 



Flowers minute, solitary, axillary; petals o; stamen 



I ; leaves linear, in whorls. Water-plants. 



H. vulgaris, Mare's-tail ; marshes and streams ; not 

 common. 



2. Myriophyllum, L. 



Flowers, minute, axillary, solitary or in spikes, uni- 

 sexual ; petals 2-4 ; stamens 2-8 ; styles 4 ; leaves very 

 narrow. Water-plants. 



