Sckeuclr.cria. ALISMACEJD. 299 



8. TRIGLOCHIN, Linn. Arrow-grass. 

 Flowers perfect, in a naked slender raceme upon a scape-like peduncle, with an 

 herbaceous deciduous perianth of 3 small concave sepals and as many similar petals. 

 Stamens 3 or 6 ; anthers oval, nearly sessile. Ovary 3 - G-celled, with sessile stig- 

 mas and solitary ovules, separating at maturity from the central axis into as many 

 distinct pods. Seed anatropous, erect ; testa membranous. Embryo straight, with 

 minute included plumule. — Marsh perennial herbs, with fibrous roots, radical 

 sheathing terete or semitercte fleshy leaves, and erect scapes. 



A {;cnn9i of about a dozen species, of whicli the two following are the more connnon and widely 

 distiil)uted. 



1. T. maritimum, Linn. Eather stout, a span to 2 or 3 feet high: leaves 

 shorter than the scape, a lino or two broad, thickish : raceme usually crowded, 4 to 

 12 inches long : flowers a lino broad : fruit oblong or ovate, obtuse at base, G- (rarely 

 3-5-) carpcUed, 1| to 2^ lines long and about equalling the pedicels. — IJeichenb. 

 Icon. Fl. Germ. vii. 38, t. 52. 



Near the sea-coast from about San Francisco to Alaska and the Arctic Ocean, and in saline 

 places in the interior across the contiiicnt ; also common in Europe and Asia. 



T. PALUSTRE, Linn. Slender, J to IJ feet high : leaves less than a line broad : flowers smaller, 

 iii a loose raceme : fruit narrow, attenuate at base, 3-carpellcd, 2J to 4 lines long, exceeding the 

 pedicels, sej)arating from l)elow upward. — A common siieoies of nearly the .same range as the^last, 

 but not yet reported from California nor from localities nearer than Utiih and Alaska. 



9. SCHEUCHZERIA, Linn. 

 Flowers perfect, in a loose few-flowered bracteate raceme, with small herbaceous 

 persistent perianth of 3 oblong sepals and 3 narrower petals. Stamens 6, with 

 linear-oblong anthers on slender exserted filaments. Ovary of 3 nearly distinct 

 ovoid 1 - 2-ovuled carpels, becoming divergent coriaceous subglobose pods, dehiscing 

 ventrally : stigmas flat and sessile. Seeds ascending, anatropous, with coriaceous 

 testa. Embryo straight, thick. — A marsh perennial herb, with a creeping jointed 

 scariously sheathed rootstock, ascending flexuous simple stems, and sheathing chan- 

 nelled teretish leaves. A single species. 



1. S. palustris, Linn. Stems a span high or less : leaves exceeding them, pitted 

 at tlio tip: raceme 4 - fi-flowered, with sheathing bi-acts, the u]ipor ones small: 

 j)erianth about 1^ lines lung: carpels 3 lines in diameter: seeds half as long. — 

 Eeichenb. Icon. Fl. Germ. x. t. 419. 



Sierra County {Lcmmon) ; Washington Territory {Lya.U, Sidsdnrf), and eastward of the Rocky 

 Mountains to New Eiifjland and Canada ; also in Europe and northern Asia. Said to have the 

 odor of hydrochloric acid. 



Order CXV. ALISMACE^. 



Marsh herbs, with scapedike stems, sheathing leaves, and perfect or unisexual 

 flowers ; perianth of 3 herbaceous persistent sepals and as many often conspicuous 

 white deciduous petals, which are imbricate or (in Alisma) involute in the bud ; 

 stamens 6 or more, included ; ovaries numerous, distinct, 1-celled and mostly 1- 

 ovuled, becoming akenes in fruit ; seeds erect, campylotropous, with membranous 

 testa ; albumen none ; embryo strongly recurved or uncinate. — Roots fibrous ; 

 leaves radical, petiolatc, and strongly nerved with transverse veinlots, the earlier 



