360 93. LEMNACB-aS. 



spatL.. — H. S. 1298. H. vii. S.-^-Root tuberous. ; Z. vernal, with 

 branching veins, gTeen or spotted with purple. ,i.Spath;ventri- 

 Cose helow and above, constricted in the middle, with inflexed 

 edges when open. Spadix blunt; with ovaries at the base ; above 

 them whorls of stamens; then a few flZaments, probably abortive 

 pistils ; club naked. Berries: scarlet, remaining after: the rest of 

 the plant has disappeared; seeds mostly 4 or 3, or rarely '2.7^- 

 Hedga-banks and thickets. P. IV. V. E. S. I. 



2. A. itallicum (Mill.) ; 11 all radical triangular-hastate with 

 divaricate lobes, spadis: clubshaped straight falling >short of the 

 widely spread spath. — R. vii. 11. — L. appearing heforethe wint&r, 

 of a dark blue-greeny sometimes with yellowish' veins, blunt. 

 Spath ventricose below, opening nearly flat -and -very broad 

 above, folding ' down in front when fl. are in perfection so as 

 to close the opening like a flap. Abortive pistils very long, 

 both above and below the stamens. — Thickets m the Underclitf, 

 Isle of Wight ; and Ohtanel Islands. P. Y. VI. E. 



Order XCIII, LEMNACE^. 



Fl. monoecious, 2, in a spath,' but without a sp'adix. Perianth 



0. Stam. 1 — 2, distinct. OVary 1-c^lied. Style short. Stigma 



simple. Fr. bladdery, not bursting. Seeds with a coriaceous 



ribbed, -testa. — ^Floating, leftflik^, small ; no distinction o^ st. or 



' leaf. Fl. very minute. 



1. _ LEMifA, ; ^path membranous, wrnshaped. ^ Stam. 1 — 2. 

 Anth. 2-eelled, didyinous (cells bilocular?).Tr-Increiasing 

 chiefly by buds. 



1. Lemna Linn. Duckweed. 



* Fronds with 2 frond-bearing lateral chinks ; underside pro- 

 ■ ducihg one or'more roots. Fl. fromthe chinks. 



1. L. trisul'ca (L.) ; fronds thin pellucid elliptic-/o«eeotoe 

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

 926. JR. vii IS.' — Fronds half an inch long, proliferous at right 

 angles.' Plants truly annual, producing, buds which survive the 

 winter as in the 6ther ppeeies. — On and in stagnant water. A. 

 VI. , , ' ', E.S. L- 



2. Z. minor (L.) ; fronts , ohovate compressed opaque, roots 

 solitary' blunt. — E. B. 1096. S. vii. 141 — Fronds 1 — 2 hues long, 

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

 A. VI. VII. . , >. j^ g J 



3. L. ffib'ba (L.) ; fronds ohovatc nearly flat'abote liemisphcri- 



