378 \ 94. USMNACE^. 



stamens ; then a few filaments, probably abortive pistils ; club 

 naked. Barries scarlet remaining after the rest of the plant has 

 disappeared; seeds mostly 4 or 3, or rarely 2.— Hedge-banks 

 and thickets. P. IV. V. E.S.I. 



2. A. ital'icum (Mill.) ; I. appearing before the tointer all radical 

 triangular-hastate with divaricate lobes, petiole longer than leaf- 

 limb, spadixelubshaped straight falling short of the widely spread 

 spath. — -R. vii. 11. — L. dark blue-green, sometimes with yellowish 

 veins, rarely spotted, blunt. Spath ventricose below, opening 

 nearly flat and very broad aho^e, folding down in front when fl. 

 are in perfection so as to close the opening like a flap, ultimately 

 bent or folded double over the yellow spadix. Abortive pistils 

 very long, both above and below the stimens. — Undercliff, Isle 

 of Wight; Channel Islands ; and W. Cornwall. E. 



Order XCIV. LEMNACE.^. 



Fl. monoecious, 2, in a spath, but without a spadix (rarely 

 found). Perianth 0. Stam. 1 — 2, distinct. Ovary 1-celled. 

 Style short. Stigma simple. Fr. bladdery, not bursting. 

 Seeds with a coriaceous ribbed testa. — Floatiog, leaflike, small, 

 proliferous ; no distinction of st. or leaf. Fl. very minute. 



1. Lbmna. Spath membranous, urnshaped. Fl. from lateral 

 clefts of frond. Stam. 1 — 2. Anth. 2-oelled, didymous 

 (cells bilocular ?). Fronds with capillary roots beneath. — 

 Increasing chiefly by offsets. 



2. WoLPPiA. Spath 0. Fl. from upper surface of frond. 

 Stam. I ; anth. 1-celled, sessile. Frond very minute, 

 rootless. — ^Increasing by offsets. 



1. Lemna Linn. Duckweed. 



1. L. trisul'ca (L.) ; fronds thin pellucid ellmtia-lanceolate 

 tailed at one end serrate at the other, roots solitary. — JS. B. 

 920. -R. vii. 15. — Fronds half an inch long, proliferous at rio-ht 

 angles. Plants submerged, truly annual, producing autumnal 

 bulblets which survive the winter as in the other species. — In 

 stagnant water. A. VI. E. S. I. 



2. L. minor (L.) ; fronds obovate compressed opaque, roots 

 solitary blunt,— ^. S. 1095. B. viii. 14.— Fronds 1—2 lines 

 long, nearly flat beneath, of a compact texture. — On stagnant 

 water. A. VI. Vn. E/ S, I. 



3. Z. gib'ba (L.) ; fronds obovate nearly flat above hemispheri- 



