528 XYRIDACE.E. (YELLOW-EYED GRASS FAMILY.) 



7. X. diffdrmis, Chapm. Scapes clustered, slender, smooth, widely 2- 

 edged above, terete or 1-2-augled below; leaves th'iu, linear lanceolate, 

 smooth ; spikes many-flowered, ovate, acute, even, often 2 - 4-cleft ; lateral 

 sepals lanceolate, with the broadly winged keel iucised-fimbriate ; petals obo- 

 vate ; seeds elliptical, smooth. Swamps near the coast, West Florida. 

 July. Scapes 1 - 1^ high. Leaves 9'- 15' long. Spikes 6"- 9" long. 

 Petals small. 



8. X. serotina, Chapm. Scapes clustered, twisted, and mostly spiral, 

 rough-angled and 2-edged above, striate ; leaves linear-lanceolate, rigid, rough 

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

 round-obovate, closely imbricated; lateral sepals linear, narrowly winged 

 above, rimbriate and at length incised ; petals small, obovate ; seeds ovoid, 

 pulverulent. Varies witli shorter leaves (2' -3'), and smaller globose or 

 ovate heads. Tine barren swamps, West Florida. Sept. -Oct. Scapes 

 :-Hhigh. Leaves 8' -12' long. Spikes 6' - 9' long. Petals 2" long. 



9. X. elata, Chapm. Scapes elongated, slender, smooth, terete below, 2- 

 edged above ; leaves long, linear, smooth ; spikes rugose, oblong or oval, often 

 acute, many-flowered ; scales dark brown ; lateral sepals linear-lanceolate, 

 sparingly toothed on the narrowly winged keel; petals wedge-obovate ; seeds 

 elliptical, smooth. Sandy swamps near the coast, West Florida. July- 

 August. Scapes 3 -4 high. Leaves l|-2 high. Spikes \'-\' long. 

 Petals 2" long. 



10. X. Caroliniana, Walt. Scapes several, smooth, rigid, 1 - 2-angled 

 below, compressed and 2-edged above; leaves linear or linear-lanceolate, 

 smooth; spikes rugose, oblong-ovate, obtuse, many-flowered, bracts light 

 brown, thick, the margins thin and soon lacerate ; lateral sepals linear lanceo- 

 late, acute, the narrowly winged keel cut-fringed above the middle ; petals 

 obovate; seeds ovoid. Shallow ponds and swamps, Florida, and north- 

 ward. July- August. Scapes l-2 high. Leaves G'- 15' long. Spikes 

 6" -12" long. 



11. X. iridifolia, Chapm. Rigid, smooth and shining; scape stout, 

 terete or 1-angled below, dilated and 2-edged above ; leaves long, strap-shaped ; 

 spikes oval or oblong, obtuse, rugose, many-flowered ; bracts dark In-own, very- 

 thick, strongly convex; lateral sepals linear, membranaceous,.the keel fimbri- 

 ate and at length incised throughout ; petals round-obovate ; seeds lanceolate, 

 angled, pulverulent. Shallow ponds, Florida. August - Oct. Scape 2- 

 3 high, 2" -3" in diameter. Leaves 2-2| long, i'- 1' wide. Spikes 1' 

 long. Petals 3" long. 



12. X. platylepis, Chapm. Scapes mostly twisted and spiral, angular 

 below, 2-edged above, roughish ; leaves linear and lanceolate, twisted, smooth; 

 spikes large, oblong or cylindrical, obtuse, many-flowered; bracts pale brown 

 or whitish, orbicular, thin, closely imbricated ; lateral sepals linear, the kee? 

 narrowly winged, fimbriate toward the apex ; petals small ; seeds elliptical, 

 smooth (X. flexuosa, Ell. ') Low sandy places, Florida to South Carolina. 

 July - Sept. Scape 2-3 high. Leaves 9'-l;V long. Spikes '-!' 

 long. 



