532 FLORA OF TEXAS. 



sejmls oval, deciduous; joctals none; anthers and ovaries 

 Sifnfit globose-triangular, pointless, when dry Swinged 

 by the compressed 3-ribbed achenia ; embryo oblong. Salt 

 marshes along the coast. August-September. Scape and 

 leaves i°-l° high. 



ALISMA, L. Water Plantain. 



Floivers perfect in a whorled panicle ; sejmls 3 ; petals 3, 

 involute in the bud, deciduous; stamens 6-12; ovaries 

 numerous in a simple whorl ; stijle short; acheniiim 1-seed- 

 ed, 2-3-keeled on the back; roots fibrous; leaves mostly 

 oval or cordate, nerved, shorter than the scape; flowers 

 white. 



A. PLAXTAGO, L. Leaves long-petioled, ovate or oblong, 

 acute, rounded or cordate at the base, 3-9-nerved ; panicle 

 large, lax, the whorled branches and elongated filiform 

 pedicels bracted at the base; aclien ia ohtwse, 15-20 in a 

 whorl. (A. trivialis, and A. parviflora, Pursh.) Ditches 

 and margins of ponds. July and August. Leaves 2'-4' 

 long ; panicle l°-2° long. 



ECHIXODOEUS, Richard. 



Floicers perfect, mostly in whorled racemes ; sepals 3 ; 

 petals 3, imbricated in the bud, withering ; stamens few or 

 numerous ; ovaries few or many, imbricated, forming rib- 

 bed aclienia in fruit, usually beaked with the persistent 

 style. — Herbs, with petioled nerved leaves ; heads mostly 

 bur-like. 



E. PARTULUS, Engelra. Small ; leaves lanceolate or spa- 

 tulate, mostly acute, finely nerved and somewhat pin nately- 

 veined, commonly sliorter than the single or clustered 1-6- 

 flowered scapes ; floivers mostly clustered or umbelled, on 

 long bracted pedicels which are recurved in fruit ; stamens 

 9 ; achenia few, shorter than the ovate sepals, obovate, 



