454 



ERIOCAULACEAE. 



VOL. I. 



About 200 species, widely distributed, mostly in warm regions. Besides the following, 3 others 

 occur in the southern United States, and 3 in Mexico. Type species : Eriocaulon decangulare L. 

 Leaf-blades as long as the sheaths, coarsely 3~9-fenestrate-nerved ; scapes 7-angled ; heads i^"-3" 



in diameter. 



Mature head spheroidal, with a spreading or reflexed involucre ; marginal flowers spreading or 



reflexed. i. E.septangulare. 



Mature head and involucre campanulate ; marginal flowers permanently erect. 2. E. Parkeri. 



Leaf-blades shorter than the sheaths, finely 6-2o-fenestrate-nerved ; scapes io-i2-angled, heads 



3"-6" in diameter. 3. E. compressum. 



Leaf-blades much longer than the sheaths, finely io-5o-nerved ; scapes io-i4-angled ; heads 4"-8" 



in diameter 4- E. decangulare. 



i. Eriocaulon septangulare With. Seven- 

 angled Pipewort. Fig. 1140. 



E. septangulare With. Bot. Arr. Brit. PI. 784. 1776. 

 Nasmythia articulata Huds. Fl. Angl. Ed. 2, 415. 1778. 

 E. articulatum Morong, Bull. Torn Club 18 : 353. 1891. 



Stem a mere crown. Leaf-blades pellucid, 3-8- 

 fenestrate-nerved, '-3' long, usually as long as the 

 sheaths ; scapes weak, twisted, about 7-angled, smooth, 

 i '-8' tall, or when submersed sometimes 4-io long; 

 involucral bracts glabrous, or the innermost bearded 

 at the apex, oblong, usually shorter than the flowers ; 

 marginal flowers usually staminate ; scales of the 

 receptacle spatulate or obovate, abruptly pointed, brown 

 above, white-woolly; staminate flowers about il"high; 

 pistillate flowers scarcely more than half as large; 

 perianth-segments white-bearded. 



In still water or on shores, Newfoundland to Ontario, 

 Minnesota, Florida and Texas. Europe. July-Oct. 



2. Eriocaulon Parkeri B. L. Robinson. Parker's 



Pipewort. Fig. 1141. 

 Eriocaulon Parkeri B. L. Robinson, Rhodora 5: 175. 1903. 



Stem very short. Leaf-blades pellucid, 7-o.-fenestrate- 

 nerved, ii'-2i' long; scapes rather rigid, mostly 7-angled, 

 smooth, 2 '-4' tall ; involucral bracts glabrous, oval, about 

 as long as the flowers; marginal flowers pistillate; 

 scales of the receptacle glabrous or nearly so; stami- 

 nate and pistillate flowers about i" high ; perianth- 

 segments of both kinds of flowers glabrous, or obscurely 

 short-pubescent at the apex. 



On the shores of the Delaware River, near Camden and V 

 Bordentown, New Jersey ; Washington, D. C. July-Oct. 



3. Eriocaulon compressum Lam. Flat- 

 tened Pipewort. Fig. 1142. 



Eriocaulon compressum Lam. Encycl. 3: 276. 1789. 

 E. gnaphalodes Michx. Fl. Bor. Am. 2: 165. 1803. 



Leaf-blades 6-2o-fenestrate-nerved, usually 

 shorter than the sheaths and tapering to a long 

 sharp point, rigid, or when submersed thin and 

 pellucid. Stem a mere crown ; scapes 6'-3 tall, 

 smooth, flattened when dry, io-12-angled; invo- 

 lucral bracts rounded, obtuse, scarious, shining, 

 smooth, imbricated in 3 or 4 series ; heads 3"-6" 

 in diameter, frequently dioecious ; receptacle gla- 

 brous; flowers i*"-2" high. 



In still shallow water, southern New Jersey to 

 Florida and Texas. At flowering time the styles and 

 stigmas are much exserted. May-Oct. 



