ORDER 134. ALISMACE^E. 323 



Sepals 3, green. Petals 8, colored or green. Stamens hypogynous. Ovaries 

 3 or more, separating into as many distinct fruits. 



BUTTOMEvE. Petals colored. Carpels 6 20, each with 00 ovules HYPROC-EIS. 1 



ALISME^E. Petals colored. Carpels many, l-2-seeded...(z) 



% JUNCAGINEjfc. Petals green. Carpels 3, each 1-3-seeded. . .(y) 



x Flowers monoecious. Stamens many SAGITTARIA. 4 



x Flowers all perfect. z Stamens 9-24 ECHINODORUS. S 



z Stamens 6. Flowers panicled.. ALISMA. 2 



y Anthers oval. Carpels 1-seeded. Leaves radical TRIGI.OCHIN. 5 



y Anthers linear. Carpels 2-3-seeded. Leaves cauline SCHEUCHZKRIA. 6 



1. HYDROCLEIS HUMBOLDTII (or Limnocliaris), from Brazil, grows 

 In pools, like Sagittaria, with long-stalked, oval, 7-veined leaves and large (2-3'j orange- 

 yellow flowers. Sepals small. Stamens 1824. Ovaries 6. 



2. ALISMA, L. WATER PLANTAIN. Sepals persistent. Petals invo- 

 lute in the bud. Ovaries and styles arranged in a circle, forming many 

 flattened achenia. n x? Acaulescent. 



A Plantago L. jS. vlmertcanum. Lvs. 5-7-veined, ovate or oval, suhcordate, pointed ; 

 scape many-flowered, fls. whorled, small, rose-white. Pools. 1 2f. July, Aug. 



3. ECHINODORUS, Rich. Sepals persistent. Petals imbricate in bud. 

 Sta. G GO. Ovaries and styles CO, imbricated, forming many flattened, 

 beaked achenia. x? Scape creeping or erect. Fls. small, white, whorled. 



1 E. radienns Eng. Loaves large (512'), 7-veined, cordate, ovate, on long petioles ; 



scape prostrate, running and rooting ; flowers clustered at the nodes, white ; stam. 

 18 24 ; ovaries very many. if. Swamps, 111. to Ga. June, July. 



2 E. rostratus Eng. Leaves 13', ovate, cordate, on long petioles; scapes er^ct, 



sharply angled ; stamens 12 ; carpels CO, strongly ribbed and beaked, (i) West. 



3 E. parvulus Eng. Leaves lance-elliptic, as long as the petioles (10 ; scapes 3-6 



flowered ; stamens 9 ; carpels about 20, beakless ; flowers about 3". (i) E. and W. 



4. SAGITTARIA, L. ARROWHEAD. Fls. 8 or $ $ , in whorls of 3 

 on the scape, the lower fertile. Petals white, larger than the sepals, imbri- 

 cated in bud. Sta. Co. Ovaries very GO, crowded in a head. Achenia 

 flattened, margined, and beaked. ? Juice milky. Leaves on long radi- 

 cal stalks, sagittate to linear. Summer. 



* Leaves mostly arrow-shaped. Filaments slender, elongated Nos. 1, 2 



* Leaves lanceolate to linear, very rarely with narrow, base lobes., .(a) 



a Filaments as long as the anthers. Pedicels all subequal No. 3 



a Filaments thick, shorter than anthers. x Fertile pedicels very short No. 4 



x Pedicels subequal Nos. 5, i 



1 S. variafoilis Eng. Scape 1 2f, 12-angled ; sterile pedicels twice longer than the 



fertile ; filaments much longer than the anthers ; achenia with a conspicuous averted 

 beak. Waters: common. Flowers about V broad. Varies exceedingly 



a Leaves lanceolate, with lance-linear lobes of the same length. 



/3. okln*0. Leaves ample (010'). broad-ovate, obtuse. Fls $. M., W., and S, 



y. latifolit!. Leaves ample, ovate, acute, their lobes ovate, pointed. 



S. g-rncilix. Leaves and their spreading lobes long, linear, acute. 



_ j?u6lrenjr. Plant pubescent all over ; leaves and lobes ovate. 



2 S. calycaiia Eng. Scape soon procumbent; pedicels all subequal; bracts ronnd- 



ifeh ; calyx closed on the fruit ; filaments as long as the anthers. Waters. Leaves as 

 in No. 1, but sometimes all linear and floating. 



