472 ALISMACE.K. (\V A IKl;-ri.ANTA I \ lA.MIKV.) 



Ouin.K 111. ALIS.>lACKuK. (\Vatki{-1'i,.\ntain Kamii.y.) 



^larsli liL'ilis, usually with crt'opiug runners or rootstocUs, nerved 

 and reticulated sheathing leaves, and scape-like steins, bearing the 

 perfect or monoecious flowers in spikes or whorled racemes. — Sepals 

 and petals 3, or the latter sometimes wanting. Stamens few or nu- 

 merous: anthers 2-celled. Ovaries 3 or many, with 1-2 anatrojious 

 or campylotropous erect ovules. Style short or none. Achenium co- 

 riaceous, 1-2-seeded. Embryo straight or curved, without allHiinen. 



Synopsis. 



SrnoRnKR I. .TUNCAGIXE^. Sepals aud petals (when present) green- 

 ish. Ovule aiiatropoiis. Embryo straight. 



1. TRIGLOCHIN. Leaves rush-like. Flowers in spiked racemes. 



SiiioiiDKK II. ALISMEiE. Petals white, deciduous.' Ovule tainpylo- 

 trtipi'us. Embryo curved or hooked. 



2. ALISM.\. Flowers perfect. Achenia whorleJ. Racemes compound. 



3. ECHINODORUS. Flowers perfect. Aclienia clustered iu a head. 



4. SAGITTARIA. Flowers inoncKcious. Aclieiua clustered iu a head. 



1. TRIGLOCHIN, L. 



Flowers perfect, in a spiked raceme. Sepals 3. I'etals -3, and greenish, 

 like the sepals, or none. Anthers 3-6, uearly sessile, oval. Ovaries 3-6, 

 united around a central axis, from which they separate at maturity, 1-ovuled. 

 Stigmas plumose. Embryo straight. — Leaves rush-like, fleshy, 2-rauked. 

 Flowers small, hractle.ss. 



1. T. triandra, Michx. Leaves erect, linear-subulate, semi-terete, di- 

 lated at the base and sheathing the base of the terete scape ; flowers numerous, 

 on short pedicels ; sepals oval, dcci<luous ; petals none ; anthers and ovaries 3; 

 fruit glol)<)se-triangular, pointless, when dry 3-winged by the compressed 3- 

 riljbed aclienia; embryo oblou<^. — Salt marshes along the coast. August - 

 Sept. — Scape aud leaves i'^- 1° high. 



2. ALISMA, L. W.vTER-Pr.AN-TAix. 



Flowers perfect in a whorled panicle. Sepals 3. Petals 3, involute in the 

 bud, deciduous. Stamens 6 -12. Ovaries numerous in a simple wliorl. Style 

 short. Achenium 1-seeded, 2 -3-keeled on tiie l)ack. — Koots flinous. Leaves 

 mostly oval or cordate, nerved, shorter than the scape. Flowers white. 



1. A. PlantagO, L. Leaves long])etioled, ovate or oblong, acute, 

 rounded or cordate at the ba.«e, 3-9-nerved; panicle large, lax, the whorled 

 branches and elongated filiform pedicels bracted at the base; aclienia ol)tuse, 

 1.5-20 in a whorl. — Ditches and margins of ponds in tlie upper districts. 

 July - August. — Leaves 2' -4' long. Panicle l°-2° long. 



