r 
Sparganiaceae. Bur-feed Family. 
Marsh or aguatic plants with creeping rootstocks and alternate 
linear leaves. Flowers monoecious, borne along the stems in compact 
globose clusters, the staminate clusters toward the ayex, the pistillate ‘ 
below, all sessile or the lowest on short peduncles. Perianth of 3-6 
chaffy segments. Stamens 5, distinct. Ovaries l-chambered, forming small 
1-2 seeded nutlets which terminate in a stout beak. 
Sparganium (Tourn.)L. Bur-feed. 
same characters as the family. 
© Pistillate flowers sessile; nutlets rownded-truncate at 
ti the apex I. Se gurycarpum 
Q Pistillate flowers on short stalks; nutlets tapering 
more or less equally both ways from the middle 
@ Beaks of the nutlets usually 1.5-2 mm. long; fruiting 
G6 heads 1.52.5 cm. in diameter ¢ 
/ = = 7 P 
t¢ Lower leaves keeled, Y-shaped in cross-section, 
5 firm, often sustaining their own weight; plants 
usually of small pools 2. Se simplex 
qi “ Lower leaves rounded, not keeled, all flat and 
@ floating in water, usually 3-8 mm. wide GB Se ancustifolium 
@ Beaks ox the nutlets less than 1 ma. long, conical; 
& fruiting heads usually about 1 cm. in diameter 4. 5. minimun 
1. 3. eurycarpum Engelm. — Stems stout, more or less erect, 
60-90 cm. tall; leaves 50-70 cm. long, 8-15 mn. wide, flat, slightly 
keeled on the lower surface; inflorescence usually branched, the pistillate 
heads very compact, 2-4, 20-25 nme in diameter when mature; perianth 
scales 5 mn. long in fruit; achenes 7-8 mn lons, rounded-truncate at the 
apex and abruptly narrowed into the stout beak which is 3-4 mm. lons. 
snacrator Coe ssoore 1505; St. Joe R., Humphrey 5 
Port Lill, iulburt & Spencef}——__ 9 
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