166 THE FLORA OF THE ALPS 
by Gremli as natives of Switzerland, all being also British 
plants: — PP. densus, L., leaves opposite; zatans, L., 
floating leaves thick, coriaceous; /luztaus, Roth; colo- 
vatus, Vahl (plantagineus, Ducr., Hornemanni, Koch) ; 
rufescens, Schrad. (alpinus, Balb.); gramineus, L. (hetero- 
phyllus, Schreb.), submerged leaves linear - lanceolate ; 
lucens, L., leaves very large and shining; 2zz2z, Roth.; 
crispus, L., leaves crisp, wavy; jperfoliatus, L., leaves 
cordate-amplexicaul ; prelongus, Wulf., leaves oblong, 
half-amplexicaul; decipzens, Nol.; pectinatus, L., leaves 
very long, filiform ; szarznus, All., spikes on long stalks, 
alpine lakes; compressus, L. (soster@foltus, Sch.), stem 
winged, leaves linear, half-amplexicaul ; acutzfolzus, Link. ; 
obtustfolius, M. K.; mucronatus, Schr.; puszllus, L., spike 
very few-flowered. 
2. ZANNICHELLIA, L. 
Flowers minute, solitary or in pairs, axillary, in a 
cuplike sheath; leaves submerged, linear. 
Z. palustris, L. (including pedunculata, Rchb.), Horned 
Pond-Weed ; stem very slender, leaves opposite ; stagnant 
water ; Switzerland, rare. 
SAN ATAS. ios 
Flowers unisexual, solitary or few, enclosed in sheaths ; 
perianth 0; stamen 1; carpel 1, with I ovule; leaves 
linear, very narrow. 
N. major, All. (marina, L.); flowers dicecious, solitary, 
leaves dentate-spiny ; stagnant water; Switzerland, Pyr- 
enees, rare. JV. minor, All. (Caulinza fragilis, Willd.) ; 
flowers moncecious, solitary or few, leaves nearly entire, 
