33G FLORA OF TEXAS. 



Racemes 1-sided, mostly compound, spreading or recurved, often erect, commonly 

 dii^posed in a pyramidal panicle. 



Smooth species, growing in marshes ; steins virgate; leaves very nvmero>/s, 7nore cr 

 less fleshy, the lowest elongated and tapering into a marginal j^etiole, the upier 

 amill and passing into bracts; heads middle-sized ; a^henia pubescent. 



S. MissouRiEXSis. Stem l°-2° high; leaves smooth 

 and shilling, the lower 3"-4" by 3-5', gradually reducing 

 upward into small bracts, lance-linear, tapering to each 

 end, 3 -veined; radical leaves oblong-lanceolate, petiolate; 

 racemes small in a dense pyramidal or somewhat corymb- 

 ous panicle; scales with greenish tips; heads small, 

 12-15-flowered; rays about 8. On Witchita Eiver. 



Leaves very numerous, gradually diminishing in size upward, veiny, sessile, or the 

 lowest narroived into a short petiole ; heads small. 



S. ULMIFOLIA, Muhl. Stem smooth, or softly pubescent 

 above; leaves ovate-lanceolate, acuminate, serrate, smooth 

 on the upper surface, paler and pubescent on the veins 

 beneath; panicle loose, spreading; heads about 10-flow- 

 ered; rays 4-5; scales of the involucre acutish ; achenia 

 nearly smooth. Stem 2°-3° high; leaves thin, 2-3' long. 



S. Elliottii, Torr. and Gray. Smooth ; stem mostly 

 simple; leaves oblong-lanceolate or elliptical, sessile, acute, 

 finely serrate, the upper often entire; racemes crowded, 

 forming a pyramidal panicle ; scales of the 13-20- 



S. ODORA, Ait. Stem 2°-3° high, mostly simple, pubes- 

 cent in lines ; leaves entire, linear-lanceolate or oblong- 

 ovate, smooth, rough margins, dotted ; panicle pyramidal, 

 mostly one-sided ; heads 5-7-flowered ; rays 3, showy ; 

 achenia hairy; leaves 1-2' long; plant anise-scented. 

 Witchita Mountains. 



Leaves more or leas prominently 5-ribbed. 



S. Canadensis, L. Stein 3°-8° high, pubescent and 

 often rough ; leaves acute or acuminate, serrate, lanceo- 

 late, rough above, pubescent beneath ; panicle pyramidal, 

 dense; heads small; rays very short; achenia pubescent. 



