20 | ALISMACEAE 
. N. conferta A. Br. Similar to N. flexilis in habit, but the leaves more 
slender Made wi with prominently mE. -toothed margins. — Tidal creeks, W Fla. 
4. N. gracilis E Small. Stem filiform, the internodes slightly armed 
near the top: leaf-blades e un um dr rupelet mainly less than 4 mm 
long.—Creeks and ponds, Fla.—All yea 
5. N. marina L. Stem stout, the ps strongly armed ur nol 
blades linear, acute: drupelet mainly over 4 mm. long. [N. m Lp 
Lakes, rivers, marshes, and salt MER various provinees, Fla. E^ Calif., 
Minn., and N. Y.—(W. I., Mez., O. W.)—Sum. 
ORDER ALISMALES — ALISMAL ORDER 
Marsh or aquatie herbs. Leaves alternate, mere phyllodia, or with 
dilated blades. . Flowers regular. Perianth of sepals and usually also of 
petals. Androecium of 3-6 stamens or more. Gynoecium of 3-many 
earpels. 
Petals nearly similar to the sepals: carpels co- 
herent. . Fam. 1. SCHEUCHZERIACEAE. 
Petals very different from the sepals: carpels not 
coherent. Fam. 2. ALISMACEAE. 
FAwinLyY 1. SCHEUCHZERIACEAE — Arrow-crass FAMILY 
Perennial herbs. Leaves narrow or slender above E dilated bases. 
Flowers ey in spikes or racemes. Perianth herbaceous. G 
3-6-carpellary. Style gine or obsolete. Fruit 3-6 turgid e — 
1. TRIGLOCHIN L. Acaulescent herbs, the perianth inconspicuous.— 
ine species, in subarctic and temperate regions. Two species, additional to 
the following, occupy similar habitats in 
North America north of our range. 
1. T. striata R. & P. Plants glabrous: 
leaves 2-3 dm. long, attenuate: raceme 2-15 
em. long: sepals ovate or oval, less inis 1 
mm. long, greenish or light-yellow: fruit 
.5-2 mm. in di iame E , each carpel 3-ribbed. 
Salt-m es, river- uate and of 
lakes, mostly near the coast, Fla. to La d 
al lif Mex., S. A.) —Sum.-fal " 
or all year S.—Reaches its best developme 
in the coastwide miansnes: It is rare in fe Plorida lake region. 
Faminty 2. ALISMACEAE — WarER-PLANTAIN FAMIL 
Annual or perennial herbs. Leaves basal, the blades flat, often with 
basal lobes, or mere phyllodia. Flowers perfect, mon oecious, or dioecious, 
whorled. Sepals herbaceous. Petals tender, white or pink. Gynoe ecium 
of few to many earpels. Style manifest. Fruit a head of flattened or 
turgid achenes.—About 14 gener a and 75 species, widely distributed in 
fresh-water swamps and marshes. 
