842 CXLV. EUIOC.VULACEiE. 



Terrestrial or marsh plants ; stems short or 0. 



Petals of male flowers 3, one much the largest and 

 protruded beyond the floral bracts ; involucral bracts 

 orbicular ; floral bracts bearded. 



Receptacle villous ; heads snowy-white ; anthers 



black; jjlant witli an odor of chamomile 3. E. odoratum. 



Receptacle glabrous or nearly so ; heads white at 

 apex, dark in lower half; anthers white ; plant 



inodorous 4. E. brevisccqncm. 



Petals of male flowers subequal or one rather larger, none 

 produced beyond the floral bracts. 



Involucral bracts woolly or hairy ; receptacle villous. 



Leaves linear, 85—8 in. long ; peduncles con- 



sjjicuously 7-ribbsd, usually twisted ; petals of 



male flowei's unequal , 6. E. Wiijhliunum. 



Leaves lanceolate, 1-2^ in. long ; peduncles 

 slightly 6-ribbed, scarcely twisted ; petals of 



male flowers subequal 6. E. lanceolatum. 



Involucral and floral bracts both glabrous or nearly so. 

 Receptacle glabrous or nearly so ; peduncles 



glabrous, 5-ribbed 7. E. Sieboldianum. 



Receptacle more or less villous. 



Plant reaching 8 in. high; peduncles 4-ribbed, 



hairy 8. E. stellatulum. 



Plant 1-2^ in. high; peduncles obsoletely ribbed, 



glabrous 9. E. 7ninutum. 



Involucral bracts alone glabrous ; floral bracts bearded 

 or pubescent. 



Peduncles 3-10 in. high. 



Receptacle sparsely hairy or glabrous. 



Receptacle sparsely hairy ; leaves 4 in. and 



more long ; peduncles 5-ribbed ; sepals 3. 10. E. sexangulare. 

 Receptacle glabrous; leaves less than 4 in. 



long; peduncles 7-ribbed ; sepals 2 11. E. cuspidatwn. 



Receptacle villous. 



Seeds closely transversely (microscopically) 

 ridged. 



Involucral bracts erect or spreading, 

 never reflexed ; heads pale grey, 

 hemispheric, witii truncate base ; 



floral bracts subacute 12. E, luzulcsfoliwin. 



Involucral bracts at first radiating 

 beyond the head, at length reflexed ; 

 heads dark grey, subglobose ; floral 



bracts subacute 13. E. irilohum. 



Seeds smooth, not transversely ridged ; 

 involucral bracts reflexed ; heads pale 

 grey or snowy white, globosely ovoid ; 



floral bracts acuminate 14. E. (jHinquangulure. 



Peduncles less than 3 in. high ; involucral bracts 

 longer than tlio flowering jtart of the head, 

 shining, pale yellow or nearly white 15. E. Xeranthemum. 



1. Eriocaulon setaceum, Linn. Sp. PI. (1753) p. 87. A sub- 

 merged aquatic ; stem 1-3 ft. long, usually simple, stout or slender, 

 densely clothed throughout its length with capillary llexuou.s glabrous, 

 pellucid, 1 -nerved leaves l|-2 in. long ; tips of stems Hoating. 

 Peduncles numerous, umbellately fasciculate on the apex of the stem, 

 14-4 in. high, slender, uneqiial, glabrous, 0-sulcate, more or less twisted ; 

 slieath |-1 in. long, obliquely split at the apex, membranous. Heads 

 subglobose, -^-^ in. in diam., greenish-white, often quite white at the 



