NAIADACEAE 19 
. HALODULE Endl. Rootstock elongate. Leaves flat above the 
sheaths. Flowers borne in the leaf-sheaths or the staminate long-exserted. 
—Two species, one in the Old World and 
one in the New 
l. H. Wrightii Aschers. Plant growing 
on sandy bottoms, the short stems aris- 
ing from the nodes of the Ede leaf- 
ades narrowly linear, ao long: 
nutlets  sessile.—B hcm alon 
the coast, southern Fla., partieularly on 
eef.—(W 
or 1 
these plants only associated 
ass 
with n turtle- grass “Thalassia, on sand 
botto 
FAMILY 4. NAIADACEAE — Narap FAMILY 
Mostly fresh-water herbs. Leaves mainly opposite: blades mostly 
eur tlie o dilated. Flowers o axillary : staminate, a double 
peri a single stamen: pistillate, a gynoecium consisti ing of an 
a a style, and 2 or 3 stigmas. Fruit drupaceous.—Consists of the fol- 
lowing genus: 
1. NAIAS L. Submerged plants with usually much-branched stems 
S humerous, the margins prominently or oo toothed.—-A bout 
10 species, salle a almost eosmopolitan.—N A1A 
Flowers monoeci ous : internodes and lower surfaces of the 
eav 
Anther {celled : : seeds shinin 
g. 1. N. flexilis. 
anier 4-celled : seeds 1d ted. 
8 eaf-margins w nute subulate teeth. 2. N. guadalupensis. 
eaf-margins w ith pronase triangular teeth. 3. N. conferta. 
Florwers d. MEE internodes and low surfaces of the 
e spir 
ben p 9. 5 n wide, with 15-24 marginal teeth: 
internodes filifor 
Lezves about 2 Bn: ` wide, with 6-10 marginal teeth : 
internodes stout. 
4. N. gracilis. 
N. marina. 
l. N. flexilis ee Rostk. ae pcd Stem slender: leaves more numero 
rather closer together and s r than ~ next following; blade mainly 
acuminate: drupelet 3-4 mm. D z Stream 
and ponds, various provinces, S. C. 
3 
B. C., and Lab.—(W. I. ? Mez. ? o w= 
Sum.—This and some of the following 
species a mins colleeted for E 
Dried en is occasionally used as a 
packing Mr E 
N. guadalupensis (Spreng.) ed 
Stem ipd or filiform: leaves 10—26 m 
long; blade acute: drupelet about 2 mm 
long. mie. per lakes, various provinees, 
2 to Tex., en and Pa.—(W. I., Mex., 
C. A. ud —fal 
