ORDER 154. ERIOCAULONACE.E. 355 



ORDER CLIII. ERIOCAULONACEJ3. 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. Perianth 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) ERIOCAULON. 1 



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



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



1. ERIOCAULON, L. PIPEWORT. Fls. s , 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. 

 if Lvs. grass-like. Scape fluted. Chaff and fls. white-woolly at tip. Jn.-Aug. 



1 E. decangulare L. Scape tali (2 3f), 10-12-ribbed ; leaves I'lnear-ensiform, sub- 



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



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



2 4' ; bracts and chaff obtuse, densely white-fringed. Swamps, N. J. to Fla. 



3 E. se|>tiin<i - ula,re Wth. Scape very slender, 7-ribbed, 3 6', or in water several feet 



according to its depth ; leaves linear-setaceous, 1 3' ; 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 Eriocaulou. 



P. flavidiis Kunth. In tnfts ; scapes 5-ribbed, minutely downy, 69'; 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 Eriocaiilon 



L. IHicliaiixii K. Scapes 15', clustered, 5-ribbed, villous, 28' (If, Chapuvut); ITS 

 flnsiform-subulate 12' ; head g obular, 1 2", brownish. Sands, Va. to F1& 



