500 XYRIDACE.K. (ykLLOAV-IYKI) GRASS FAMILY.) 



fan, laterally curved; spikes oMong, mostly acute, fvw-flowered, an;,'ular; liracts 

 li;;ht brown, entire; lateral sepals lanecolate, short-fringed on tlic Avingless keel ; 

 petals oliovate ; sterile filaments often beardless. — Low pine barrens, near tlio 

 coast, West Florida. April and May. — Seape 4' - 1 2' hiyli. Leaves ^' - 1 ' long. 

 Spikes 2" -4" long. Petals 2" long. 



^ 12. SI;fath of the scape sJiorfer than the Itm-es. Perennials. 



* SterUe filaments bearded : sepals included. 



•f- Lateral sepals frimjid on the hil. 



•3. X. ambigua, Beyr. Seape rigid, finely furrowed, rough, 2-cdged 



above, 1 -angled below ; leaves linear-laneeolate, rough on the edges ; spike 



ovate-laneeolatc or oblong, even, often acute, niany-flowcred ; bracts light brown, 



oval, not crowded on the splice ; lateral sepals lanceolate, tapering at each end, 



shining, narrowly winged ; petals round obovate ; seeds ovoid. — Open grassy 



pine barrens, Florida to North Carolina. July - Sept. — Scape 2° -3° high, 



mostly solitary. Leaves 6'- 12' long. Spikes 9"- 15" long. Petals ^' long. 



4. X. Stricta, n. sp. Scape flattened and broadly margined, rough-edged 

 above, smooth and 1 - 2-anglcd below, slightly striate ; leaves long, linear, 

 smooth ; spikes oblong or cylinclrieal, oljtuse, many-flowered ; bracts dark 

 brown, orbicular, crowded on the spike ; lateral sepals broadly winged above 

 the middle, narrowed below ; petals small, wedge-obovatc ; seeds ovoid. — 

 Shallow ponds in the pine barrens. West Florida. July -Sept. — Scapes 

 slender, clustered, 2° -3° high. Leaves 1°-1^° long. Spikes 9" -12" long. 

 Petals 2" long. 



5. X. flexuosa, J.Iuhl. Somewhat bulbous ; scape smooth, 2-cdged above, 

 nearly terete below; leaves linear, sinoolli ; s;)ikes globose, few-flowcrcd ; latend 

 sepals lanceolate, wingless. (X. bulbosa, /Cmilh.) — Swamps in the upper dis- 

 tricts of Georgia, and northward. July -Sept. — Scape C- 12' high. Leaves 

 4' - 8' long. Spike 3" - b" long. 



^- -I- Liitmd sepals hroadlij irivged, and i-arioitsli/ tootlud or Jimhriate. 



6. X. Elliottii. Seape slender, flattened and 2-edgcd throughout, cr 1- 

 ed;:ed below, roughish and mostly spiral ; leaves narrowly linear, sharp-ed^ed, 

 twisted ; spike few-flowered, elliptical, obtuse ; lateral sepals linear, the wing 

 <"ut-toothcd above the middle ; petals obovate. (X. brevifolia, Lll. ex descr.) — 

 AVet grassy pine barrens, Florida to SouUi Carolina. July. — Seape 1°-1^° 

 liigh. Leaves 6' -9' long. Petals 3" long. 



7 X. diflTormis, n. sp. Scapes clustered, slcnd- r, smooth, widely 2-edged 

 above, terete or 1 - 2-angled below ; leaves thin, linear-lanceolate, .•■mooiii ; spikes 

 many-flowered, ovate, acute, even, often 2-4-cleft; lateral sepals lanceolate, with 

 l!ic broadly winged keel incised-fimbriate ; petals obovate; seids eliii)tiial, 

 smooth. — Swamps near the coast. West Florida. July — Scapes 1 ° - 1 .^° higii. 

 Leaves 9' - 1 .')' long. Spikes 6" - 9" long. Petals small. 



8. X. SCrotina, n. sp. Scapes clustered, twiste<l and mostly spiral, n>Mt;h- 

 angled and 2-<'dgr(l above, striate ; leaves linear-lanceolate, riirid, rough on tlio 

 edges ; spikes many-flowered, ovoid, obtuse, dark brown, even ; bracts round- 



