ORDER 154. ERIOCAULONACE^E. 355 



ORDER CLIII. ERIOCAULONACE^E. PIPEWORTS. 



Herbs perennial, aquatic, with linear, cellular, spongy leaves sheathing the 

 base of the slender scapes, which bear a dense head of minute imperfect 

 flowers at top. Pwianth 2-6-parted or 0. Stamens 6, some of them gener- 

 ally abortive. Ovary 2- or 3-celled, cells 1-seeded. 



Stamens (4 or 6) twice as many as the petals. (Scape 7-12-ribbed) ERIOCACLON. 1 



Stamens 3, as mnny as the petals. (Scape 5-ribbed, puberulent) P^KPALANTHUS. 2 



Stamens 3, and no petals. Scape 5-ribbed, short, hairy LACHNOCAULON. 3 



1. ERIOCAULON, L. PIPEWORT. Fls. 8 , in a compact head, with 

 an involucre, the marginal fertile. Sepals 3. $ Petals 2 or 3, black-tipped, 

 united, sta. 4 or 6. ? Pet. 2 or 3, distinct, sta. 0. Style 1, stigmas 2 or 3. 

 It L vs. grass-like. Scape fluted. Chaff and fls. white-woolly at tip. Jn.-Aug. 



1 E. decangnlare L. Scape tall (2 'tf ), 10-12-ribbed ; leaves Lnear-ensiform, sub- 



erect, near | as long as the scapes ; head 3 5''; chaff pointed. Swamps, Va. to Fla". 



2 E. gnaplia lodes MX. Scape tall (1 2^f ), 10-ribbed ; leaves ensiform-subnlate, 



II' ; bracts and chaff obtuse, densely white-fringed. Swamps, "N. J. to Fla. 



3 E. septangulare Wth. Scape very slender, 7-ribbed, 3 6', or in water several feet 



according to its depth ; leaves linear-setaceous, 13' ; heads globular. N. J. to Mich. 



2. PJEPALANTHUS, Mart. Flowers 3-parted. Stamens in the sterile 

 flowers 3. Stigmas in the fertile flowers 3. Capsule 3-seeded. Otherwise 

 nearly as in Eriocaulon. 



P. flavidus Knnth. In tufts ; scapes 5-ribbed, minutely downy, 6 9 r ; leaves linear 

 setaceous, 1 2' ; head finally globular, bracts obtuse, straw-colored. Va. to Fla. 



3. LACHNOCAULON, Kunth. $ Calyx 3-sepalled. Cor. 0. Sta, 3, 

 anth. 1-celled, filaments united below. $ Cal. 3-sepalled. Cor. reduced to 

 a tuft of hairs surrounding the 3-seeded caps. Otherwise as in Eriocaulon 

 L. Micliauxii K. Scapes 15', clustered, 5-ribbed, villous, 28' (If, Chapman); ly- 



ensifonn-eubulate 12' ; head g obular, 12", brownish. Sands, Va. to Fla 



