Class III. Order III. 17 



16. XYRIS. 



XYRIS JUPICAI. Mich. Yellow eyed grass. 



Leaves linear, somewhat obtuse ; scape near the 

 head dilated, two edged ; scales rounded. 



Syn. XTRIS CAROLINIANS. Lam. Poir. 



Root bulbous ; leaves grassy, shorter than the scape ; scape 

 erect, two edged, twisted, a little widened at top. Heads round- 

 ish, rather acute, supporting a number of small yellow llorets 

 projecting out of the scales, hairy within, and consisting of three 

 ovate, crenate petals. Meadows. July, August. Perennial. 



17. SCHCENUS. 



SCHCENUS MARISCOIDES. Muhl. Water Bog rush. 



Culm round ; leaves channelled ; umbel terminal, 

 spikes fascicled. 



A firm rush a foot or two high. Leaves half cylindrical, chan- 

 nelled. Fascicles about three together, each containing a dozen 

 lanceolate, brown spikes. Edges of Fresh pond. July. Pe- 

 rennial. 



Siibgenus RHYNCOSPORA. Seed surrounded with bristles style 

 persistent. 

 SCH(ENUS ALBUS. L. White headed Bog rush. 



Culm three sided, leafy ; flowers fascicled ; leaves 

 setaceous. 



Syn. RHTNCOSPQRA ALBA. Vahl. 



A smooth, grassy plant, with white heads of flowers. Stem 

 half a foot or more in height, three sided, mostly smooth. Leaves 

 mostly belonging to the stem, alternate, sheathing, the sheaths 

 tubular or entire. Flowers in fascicles on footstalks, terminal 

 and axillary, erect. Glumes white, afterward becoming brown- 

 ish. Seeds surrounded with short hairs. In low woods and 

 swamps. Brighton. July. Perennial. 

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