ORDER 134. ALISMACE^E. 323 



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

 3 or more, separating into as many distinct fruits. 



% BOTTOMED. Petals colored. Carpels 620, each with 00 ovules HTPROCUCIS. 1 



ALISME.E. Petals colored. Carpels many, 1-2-seeded. . .(x) 



I JUNCAGINEJE. Petals green. Carpels 3, each 1-3-seeded. . .(y) 



x Flowers monoecious. Stamens many SAGITTAKIA. 4 



x Flowers all perfect. z Stamens 924 E CHIXODORUS. S 



a Stamens 6. Flowers panicled ALISMA. 2 



y Anthers oval. Carpels 1-seeded. Leaves radical TKIGLOCHIN. 5 



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



1. HYDROCLEIS HUMBOLDTTI (or Limnocharis), from Brazil, grows 

 In pools, like Sagittaria, with long-stalked, oval, 7-veined leaves and large (230 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. llsff Acaulescent. 



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

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



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

 Sta. 6 GO. Ovaries and styles GO, imbricated, forming many flattened, 

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



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



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

 1824 ; ovaries very many. if. Swamps, 111. to Ga. June, July. 



2 E. restrains Eng. Leaves 13', ovate, cordate, on long petioles; scapes erect, 



sharply angled ; stamens 12 ; carpels GO, 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. GO. Ovaries very GO, crowded in a head. Achenia 

 flattened, margined, and beaked. sy 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 subeqnal No. 3 



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



x Pedicel? eubequal Nos. 5, (. 



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



fertile ; filaments much lonrjer 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. oblutta. Leaves ample (6 10'), broad-ovate, obtuse. Fls t <k . M.,W., midS 

 y. lattfolia. Leaves ample, ovate, acute, their lobes ovate, pointed. 

 5. g-rdctlis. Leaves and their spreading lobes long, linear, acute. 

 . pu1>< ncen* Plant pubescent all over ; leaves and lobes ovate. 



2 S. oalycina. Eng. Scape soon procumbent; pedicels all subequal; bracts roniid- 



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

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



