36 



A. Sheath of scape longer than the leaves. 

 I. Xyris BREVIFOLIA, Michx. 



X. brevifolia, Mich. Fl. Bor. Amer. i. 23 (1803). 



Scape terete, smooth, occasionally spirally twisted and 4- 1 2 

 inches high. Leaves linear, narrow, edges smooth, 1-3 inches 

 long ; spikes globose, light brown ; scales usually lacerate on 

 the outer margin, oblong ; wingless keel of lateral sepals very 

 slightly crenulate. 



Florida. — Jacksonville, A. H. Curtiss, No. 3,000; St. Augus- 

 tine, W. M. Canby, 1869 ; Tampa, J. D. Smith ; Herb. Dr. Chap- 

 man ; Indian River, Ed. Palmer, No. 576; Apalachicola, B. F. 

 Saurman ; Manatee, A. P. Garber, F. Cozzans, Dr. Bacon ; De 

 Land, G. D. Hulst (1891) ; Lloyd's, L. H. Lighthipe (1891) ; 

 Lake Winnemissett, G. D. Hulst (1891). 



2. Xyris flabelliformis, Chapm. 

 X. flabellifonnis, Chapm. Fl. S. U. S. 498 (i860). 

 X. scirpoides, Chapm. Mss, in Herb. Col. Coll. 

 X. brevifolia^ /? stibcarinata, Chapm. Mss. in Herb. Col. Coll. 



Scapes slender, usually spirally twisted, 4-12 inches high, 

 clustered ; leaves linear-lanceolate to linear, short, spreading ; 

 spikes globose to oblong, few flowered ; bracts light brown, 

 angular, their margins entire; lateral sepals shortly cut-fringed on 

 the wingless keel. 



Florida.— Ex. Herb. S. T. Olney; Herb. Col. Coll.; Hibernia, 

 W. M. Canby; Manatee Co., J. T. Rothrock ; Jacksonville, A. H. 

 Curtiss, No. 3,001. 



B. Sheath of scape shorter than leaves. 



* Narrowly winged keel of lateral sepals fringed with hairs. 



3. Xyris ambigua, Beyr. 

 X. ambigua, Beyr. in Kunth, Enum. iv. ii (1843). 

 X. stricta, Chapm. Fl. S. U. S. 498 (i860). 

 X. rhovibipetala, Sauv. Fl. Cub. 160 (1868). 



Scape rigid, sHghtly twisted, furrowed, two-edged above, 2- 

 3 feet high; leaves linear-lanceolate, 6-12 inches long, smooth 

 and shining ; spikes ovate-lanceolate, oblong or cylindric, gen- 

 erally acute, sometimes obtuse, many-flowered; bracts convex, 

 light brown ; lateral sepals lanceolate, shining, the upper two- 

 thirds of the narrowly winged keel fringed and tapering at both 

 ends. 



