14 SPARGANIACEAE 
FaAxiLyY 2. SPARGANIACHAE—Bur-REED FAMILY 
Plants erect, or rarely floating. Spikes Aen borne in racemes or 
panicles, or spicate, their bracts. persistent. Perianth of scales. Pistil 
sessile: stigma subulate, lanceolate, elliptic, or em Fruit an achene. 
Related to the oe but with less modified flower-parts. Comprises 
the following genus 
1. SPARGANIUM [Tourn.] L. Plants growing in low grounds, marshes, or 
deep water. Stem not sheathed. Leaves erect and triangular-keeled at the 
base or floating and flat.—About 24 species in temperate and boreal regions.— 
A dozen species additional to those described below occur elsewhere in North 
America.—Sum.—BUR-REEDS 
Achene fusiform, the body stalked: fruit-producing flowers pedi- 
celled. 1. S. americanum. 
Achene obovoid or obpyramidal, sessile: fruit-producing flowers 
sessile. 2. S. eurycarpum. 
i. S. americanum Nutt. Plant 2-8 dm. tall, simple or branched: staminate 
heads mostly less than 1 em. thick: A head 1-2 em. thick: achene-body 6-7 
mm. long, narrowed at the apex, stipit 
[S. simplex (Chapm. Fl.) ]—River- iue 
akes S M 
and 
Plants ari branched inforeseenes have been 
referred to S. androcladum. 
S. eurycarpum Engelm. Plant por 
-head 2.5 em. th 
m. long, rounded or depressed at the i 
sessile.—Marshes, psi banks, and M 
various A Fla. to Calif., B. j 
Newf.—T = ae plan ET Y 
Hol ills ence ponds and str ae the dense growth of r resem- 
bling species of iris or of sweet-flag (Acorus). 
OnpER NAIADALES — NAIADAL ORDER 
Perennial aquatie or marsh herbs. Leaves various, sometimes mere 
phyllodia. Flowers usually symmetric. Perianth wanting or imperfect. 
Androecium usually of 1-4 stamens. Gynoecium simple or several-car- 
pellary. 
Gynoecium of distinct carpels. Fam. 1. ZANNICHELLIACEAE, 
Gynoecium of one carpel, or of united carpels. 
oa E and pistillate flowers borne alternately i 
on e-sided spadix, laterally atta i Fam. 2. ZOSTERACEAE. 
Sm due pose pistillate flowers borne in the leaf- 
axils. 
Staminate flower consisting of 2 anthers termin- 
ating an elongate pedicel: perianth wanting: 
stigmas liform : eaulescent plants with en- 
tire leaf-blades. Fam. 3. CYMODOCEACEAE. 
c Rd sessile or nearly so, consisting 
of nther surrounded by the perianth: 
stigmas "eupulate- caulescent plants with 
spiny toothed leaf-blades. Fam. 4. NAIADACEAE. 
