370 MONOCOTYLEDONOUS PLANTS. 



linear-subulate, channelled, smooth, pellucid, 5-nerved, transversely 

 striate ; head small, globose ; scales of the involucre oval, obtuse. 

 HAB. In ponds. Can. and N. S. Aug. H , Scape 4 8 inches 

 high, very slender. Flowers white. Pipetcort. 



2. E. decangvlare Mich. :. scape 10-furrowed ; leaves ensiform, 

 smooth ; head large, depressed- globose ^ scales of the involucre oval, 

 acute, of the receptacle mucrohate. '* 



HAB. Ponds. N. J. to Car. Aug. If . Scape 23 feet high. 

 Flowers very white. 



ORDER CXXVlI. XYRIDE^E. Kunth. Lind. 



Perianth 6-parted, in 2 rows ; outer glumaceous ; inner pe- 

 laloid, unguiculate. Stamens 6, 3 fertile inserted upon the 

 apex of the claw of the segments of the inner row -of the pe- 

 rianth ; anthers bursting outwardly. ^Qvary single; styh tri- 

 fid; stigmas obtuse, multifid or undivided. Capsule 1-celled, 

 3-valved, many-seeded, with parietal placentce. Seeds nu- 

 merous ; embryo on the outside of the albumen at the ex- 

 tremity remote from the hilura. 



Herbs with fibrous roots. Leaves radical, with dilated sca- 

 rious bases. 



1. XYRIS. Linn. 



Flowers in an ovate cylindric head. Perianth G-parted, in 

 2 rows ; outer glumaceous, 3-valved cartilaginous ; inner 

 equal. Stigma 3-cleft. Triandria. Monogynia. 



1. X. caroliniana Walt. : leaves linear, grass like ; scape 2-edged ; 

 head ovate, rather acute ; scales round. H.jupacai Mich H.fezuosa 

 Ell. 



HAB. Wet meadows. N. Y. to Flor. July. If. Stem a foot 

 high, a little twisted. Leaves sometimes spiral. Flmcers yel- 

 low, in a small head Very variable. Yeiloic-cyed Grass. 



2. X. brecifolia Mich. : leaves subulate, ensiform, short ; head near- 

 ly globose ; inner valve of the glume shorter than the outer one, 

 slightly notched. . -, . 



HAB. Wet meadows. Pem*. to Geor. July. If. Scape 1218 

 inches high, compressed near the summit. Leaves much twist- 

 ed. Flowers yellow. 



ORDER CXXVIII. JUNCE.E. Juss. Lind. 



Flowers monoclinous or diclinous. Perianth 6-ported, 

 more or less glumaceous. Stamens G, inserted into the base 

 of the segments ; sometimes only 3 and opposite the outer 



