470 FLORA OF TEXAS. 



ovate, acuminate, petioled; sheaths loose, salver-form; 

 spikes panicled, cylindrical, dense, nodding; bracts ovate; 

 floicers large, bright rose-color. June-September. Stem 

 3°-5° high ; spikes 2-3' long. 



Pebsicaria. Flowers in closely-bracUd spikes; stamens 4-8 ; styles 2-3, or 2-3-cle/t; 

 achenium Z-angled or lenticular; cotyledons accumt)€ni ; altmmen horny; 

 sheaths cylindrical^ truncate. 



* Sheaths naked; style 2-de/l or 2-parted ; achenium lenticular. 



P. IXCARXATUM, Ell. Stem smooth below, the summit of 

 the branches, peduncles, and calyx sprinkled with glandu- 

 lar dots ; leaves lanceolate, long-acuminate, petioled, rough 

 on the margins and veins; sheaths slender, appressed ; 

 5;? 1^-65 racemed, linear, nodding; bracts spreading, acute, 

 longer than the ]}ed[ce\s ; Jloivei's small, flesh-color; sfa- 

 mens 6 ; style 3-parted ; achenium ovate, with the sides con- 

 cave. Ponds and ditches. July-October. Stem 2°-3° 

 high; leaves 6-8' long; spikes l'-2' long. Annual. 



** Sheathe fringed with bristly hairs ; achenium 5-angled, or sometimes lenticular ; 

 stamens mostly 8. 



P. Persicakia, L. Stem smooth, branching from the 

 base, erect or diffuse ; leaves lanceolate or oblong, obtuse 

 or acutish, the margins and veins roughened ; sheaths 

 short, nearly smooth, fringed with a few short bristles ; 

 spikes short, oblong, obtuse, dense-flowered; flowers rose- 

 color; stamens 6-7; style half 2-cleft; ache^iium lenticu- 

 lar or 3-angled, smooth and shining. Low places around 

 dwellings and along roads. July. Stem 1°-1J° high ; 

 leaves 2'-4' long, often with a dark triangular spot in the 

 middle; spikes ^'-1' long. Annual. 



P. SETACEUM, Baldw. Stem erect, sparingly branched, 

 smooth below, the upper portion, like the peduncles and 

 lanceolate glandless leaves, rough with appressed hairs; 

 stiptiles appressed-hirsute, copiously fringed with long 

 bristles ; spikes filiform, by pairs, loose-flowered ; flowers 

 white, glandless ; stamens 8 ; style 3-cleft ; achenium 



