450 
LEMNACEJE. (DUCKWEED FAMILY.) 
2. Li. minor, L. Fronds roundish-obovate, thickish (about 2" 
long), often grouped ; “ ovule solitary , half-anatropous ; seed horizon¬ 
tal” — Very common, mantling stagant waters; but not yet found in 
flower in this country. 
3. Li. trisulca, L. Fronds oblong-lanceolate from a stalked 
base , thin, denticulate at the tip (£'-§' long), proliferous from the 
sides near the middle so as to form crosses ; u ovule solitary , half ana¬ 
tropous.” — Ponds, not rare ; but the flowers little known. 
4. Ij. gil»1m, L. Fronds obovate , nearly flat above , tumid and 
spongy underneath (hemispherical), proliferous on short and very fra¬ 
gile stalks, therefore seldom found connected (3" - 4"long); ovules 
and seeds 2- several, anatropous. (Telmatophcice, Schleiden .) — Ponds, 
Western New York : rare. 
* * Fronds bearing a cluster of roots from the lower surface. 
5. I., polyrlliza, L. Fronds roundish-obovate, thickish, 
flat above, slightly convex underneath, palmately veined (3"-4" 
long) ; “ ovules 2, anatropous.” (Spirodela, Schleiden.) — Pools, &c., 
less common than No. 2 in this country, where it has not been found 
in flower. 
Order 111. TYPHACEiE. (Cat-tail Family.) 
Marsh herbs , with nerved and linear sessile leaves , and 
monoecious flowers on a spadix or in heads, destitute of 
proper floral envelopes . Ovary tapering into a slender 
style, and usually an elongated tongue-shaped 1-sided stig¬ 
ma. Fruit nut-like when ripe, 1-seeded. Seed suspended, 
anatropous: the embryo straight in copious albumen. 
Comprises only 2 genera, viz. 
1« TYPHA, Tourn. Cat-tail Flag. 
Flowers in a long and very dense cylindrical spike terminating 
the stem ; the upper part consisting of stamens only, intermixed 
with simple hairs, and inserted directly on the axis ; the lower or 
fertile part consisting of ovaries, surrounded by club-shaped bris¬ 
tles, which form the copious down of the fruit. Nutlets minute, 
very long-stalked. — Spathes very deciduous bracts or none. 
Rootstocks creeping. Leaves sheathing the base of the simple 
jointless stems, erect, thickish. (Name from Ti(f)os, a marsh or 
fen, alluding to the place of growth.) 
!• X, latifolia, L. (Common Cat-tail or Reed-mace.) Leaves 
