JUNCAGINACE/E. 379 



4. ?. "Mtans Mich. -. leaves floating, elliptic-lanceolate, obtuse, 3-nerved, 

 attenuate at base ; lower ones subcordate ; scape simple, few-flowered ; 

 lower peduncles elongated. 



In water. Penn. Muld. S. to Car. July, Aug. 1\.. Scape mostly erect, 

 3 6 inches long. Leaves generally floating, 1 2 inches long. Flowers few, 

 small, the upper sterile. Ell. Floating Arrowhead. 



2. ALISMA. Linn.W&ter Plantain. 

 (From the Celtic aZis, water ; in allusion to its place of growth.) 



Perianth 6 -leaved ; 3 outer leaves persistent, calycine ; 3 

 inner colored, petaloid, deciduous. Stamens 6. Ovaries and 

 styles numerous. Carpels numerous, distinct, 1 -seeded, crowned 

 with the persistent style. 



A. Plantago Linn. : stemless ; leaves ovate-cordate, acute, nerved ; flow- 

 ers in a compound verticillate panicle ; fruit obtusely triangular. A. trim- 

 alls and parviflora Pursh. 



Wet grounds. Can. to Flor. W. to the Platte River. July, Aug. 9|. 

 Scape 1 2 feet high, triangular. Leaves all radical, on long petioles, mostly 

 9-nerved. Panicle much decompounded in a verticillate manner. Flowers 

 white, tinged with purple. Fruit consisting of numerous carpels verticillately 

 arranged. Common Water Plantain. 



ORDER CXLI. JUNCAGINACE^E. ARROW GRASSES. 



Perianth 6 -leaved ; the 3 inner leaves narrower. Stamens 6. 

 Carpels 3 6, free, united or distinct. Fruit dry, 1 or 2-seeded. 

 Seeds without albumen ; embryo with a lateral cleft. Herba- 

 ceous aquatic or marsh plants, with ensiform leaves and the 

 flowers in spikes or racemes. 



1. TRIGLOCHIN. Linn. Arrow Grass. 



(From the Greek rpeis, three, and y^w^is, a point ; in allusion to the three 

 points of the capsules.) 



Perianth somewhat colored, deciduous ; leaves concave. Sta- 

 mens 6 ; anthers subsessile. Capsules 3 6, united by a lon- 

 gitudinal receptacle from which they usually separate at the 

 base, 1 -seeded. 



1. T. palustre Linn. : fruit of 3 united carpels, nearly linear, subulate at 

 the base. 



Marshes. Salina and elsewhere in Western N. Y. N. to Arct. Amer. July. 

 1J-. Scape about a foot high, very slender. Leaves very numerous, all radical 

 or nearly so, linear, fleshy, slightly grooved on the upper side, nearly as long as 

 the scape. Flowers small, greenish, in a terminal lax spike or raceme. The 

 leaves, when bruised, give out a very fetid odor. Marsh Arrow Grass. 



2. T. maritimum Linn. : fruit ovoid, of 6 united oblong carpels. T. 

 datum Nutt. 



Salt marshes. Can. to Penn. W. to Mich. July. %. Scape 18 inches 



