OKDER 154. ERIOCAULONACE^E. 355 



ORDER CLIII. ERIOCAULONACE^E. PIPEWORTS. 



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

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

 flmeers at top. Perianth 2-6-parted or 0. SUimens 6, some of them gener- 

 ally abortive. Oixiry 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^BPALANTUPS. 2 



Sninieiis 3, and no petals. Scape 5-ribbed, short, hairy LACHMOCACLON. 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. 9 Pet. 2 or 3, distinct, sta. 0. Style 1, stigmas 2 or 8. 

 1C Lvs. grass-like. Scape fluted. Chaff and fls. white-woolly at tip. Ju.-Aug. 



1 E. dccangulare L. Scape tall (2 f), 10-12-ribbed ; leaves llnear-ensiforrn, unb- 



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



2 K. gnaphulodes MX. Scape tall (1 2K), 10-ribbed ; leaves ensiforni-subnlate, 



2 4' : bracts and chaft' obtuse, densely white-friuged. Swamps, N. J. to Fla. 



3 K. M<'<>tuiiu' ii la.ro Wth. Scape very slender, 7-ribbed, 3 (/, 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 Eriocaulon. 



P. flavldus Kunth. In tufts; scapes 5-ribbed, minutely downy, 6-9'; leave? linear 

 setaceous, 12' ; 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. Hlchauxll K. Scapes 15', clustered, 5-ribbed, villons, 48' (If, Chapim.i) ; Ivs 

 eimiform subulate 13' ; head R obulur. 18", brownish. Sands. Va. to Flu 



