94. LEMXACE-E. 
435 
ultimately bent or folded double over the yellow spadix. 
Abortive pistils very long, both above and below the stamens. 
— W. Cornw. S. Devon. I. of Wight. Channel I. E. 
Order XCIV. LEMNACE.E. 
Fl. (rarely found) monoecious, 2, in a spath, but without a 
spadix. Perianth 0. Stam. 1 — 2, distinct. Ovary 1-celled. 
J^tyle short. Stigma simple. Fr. bladdery, not bursting. 
S 'eds with a coriaceous ribbed testa. — Floating, leaflike, small, 
proliferous ; no distinction of st. or leaf. Fl. very minute. 
1. Lemna. Spath membranous, urnshaped. Fl. from lateral 
cleft of fronds. Stam. 1 — 2. Anth. 2-celled, didymous 
(cells bilocular ?). Fronds with capillary roots beneath. — 
Increasing chiefly by offsets. 
2. WoLFFiA. Spath 0. Fl. from upper surface of frond. 
Stam. 1 ; anth. 1-celled, sessile. Frond very minute, 
rootless.— Increasing by offsets. 
1. Lemna Linn. Duckweed. 
1. L. trisitl'ca (L.) ; fronds thin pellucid elliptic-lanceolate 
tailed at one end serrate at the other, roots solitary. — E. B. 
926. R. vii. 15. — Fronds half an inch long, proliferous at right 
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. — E. B. 1095. R. viii. 14.— Fronds 1 — 2 lines 
long, nearly flat beneath, of a compact texture. — On stagnant 
water. A. VI. VII. E. S. I. 
3. L. gib'ba (L.) ; fronds obovate nearly flat above hemispheri- 
cal and spongy beneath, roots solitary blunt. — E. B. 1233. R. 
vii. 14. Telniatophace Schleid., Endl. — Fronds 1 — 2 lines long, 
at first flatfish, afterwards remarkably gibbous and ceUular 
beneath. — On stagnant water. A. VI. — VIII. E. S. I. 
4. L. pohp'rhiza (L.) ; fronds roundish-ohovate, comj^ressed, 
roots many clustered acute.— B. 2458. R. vii. 15. Spirodela 
Schleid., Endl. — Fronds half an in. long, gi-een above, purple 
beneath. Fl. not seen in Britain. — On water. A. E. S. I. 
