92 SPARGANIACEAE 
Stem more slender than the last and generally higher. The cylinder of 
staminate flowers does not extend down to the other cylinder, but there 
is between the two a space of naked stem, of from 1 to 3 inches. Sit- 
uations similar to No. l. 
Famity II].—SPARGANIACEAE. Buor-reep FAMILY 
Marsh plants with long linear leaves and tall flower stem usually 
branching near the summit and bearing several globe-formed heads, 
the heads nearest the summit being much smaller than those be- 
low. The upper are the staminate flowers, the others the pistillate. 
Immediately below each of the larger balls a long slender leafy 
bract starts, which is related to the spathe of the arum family. 
Each ball of pistillate flowers represents a collection of many seed- 
carpels. 
SPARGANIUM, (Tourn.) L. 
Has the characters described above. 
1. §. eurycarpum, Engelm. (Fig. 3, pl. 3.) Broap Fruitep Bur- 
REED. Stem 3 to 8 ft. high; 2 to 4 pistillate heads on each stem, each 
usually on a short flower stalk; 5 or more smaller staminate heads above 
the pistillate. The extremity of the pistil divides in two parts (stigmas). 
2. §. androcladum, Engelm. BraNcHING Bur-REED. Pistillate heads 
3 to 7, plant more branching than No. 1, and smaller, 1 to 2 ft. high. 
Pistil extremity (stigma) single. 
3. §. americanum, Nutt. AMERICAN BUR-REED. Resembles No. 2, but 
is not branching. The lower flower heads on short stems. Low grounds. 
Summer. 
4. §. simplex, Hudson. (Fig. 4, pl. 3.) Srtmpre STEMMED BUR-REED. 
Stem 2 to 24 in. high, not branching. Pistillate and staminate heads on 
a straight stem. Generally erect. Lower flower heads without stems. 
5. §. minimum, Fries. (Fig. 5, pl. 3.) SMALL Bur-REED, A slender 
floating species. From a few in. to 2 ft. high, with pelucid floating leaves. 
Generally, one staminate and about two pistillate heads. 
6. §. lucidum, Fernald & Eames. Plant 30 to 36 in. high, the leaves 
much overtopping the inflorescence. Pistillate flower heads only at the 
axils and on short stems. Fruit lustrous. Muddy shores, Mass. and 
south. 
7. §. angustifolium, Michx. Slender, 12 to 36 in. high, growing in 
ponds and slow streams. Leaves very long and narrow. Heads of pis- 
tillate flowers somewhat above the axils and lower ones on short stems. 
New England and west. 
8. §. fluctuans, (Morong.) Robinson. Plant 15 to 40 in. high. Leaves 
narrow and long. Flower heads on branches, each af 2 or 3 branches 
bearing 3 to 5 heads. Margins of cool lakes, usually at a depth of 20 or 
30 inches. 
