ORDER 134. ALISMACE^. 323 



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

 8 or mere, separating into as many distinct fruits. 



5 BUTTOMEjE. Petals colored. Carpels 6 20, each with 00 ovules HYPBOOUCIS. 1 



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



S JUNCAGINEjE. Petals green. Carpels 3, each 1-3-seeded . . . (y) 



x Flowers monoecious. Stamens many SAGITTARIA. 4 



z Flowers all perfect. z Stamens 924 ECHINODORUS. S 



z Stamens 6. Flowers panicled AMSMA. 2 



y Anthers oral. Carpels 1-seeded. Leaves radical TBIGLOCHIN. 5 



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



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

 In pools, like Sagittaria, with long-etalked, oval, 7-veined leaves and large (230 orange- 

 yellow flowers. Sepals small. Stamens 18 24. Ovaries 6. 



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

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

 flattened acbenia. U zff Acaulescent. 



A. Plantago L. p. Jlmericanwm. Lvs. 5-7-veined, ovate or oval, suhcorthte, pointed, 

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



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

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

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



1 IS. radicans Eng. Leaves large (5 12'), 7-veined, cordate, ovate, on long petioles ; 



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

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



2 E. rOstratus Eng. Leaves 1 3', ovate, cordate, on long petioles ; scapes er^ct, 



sharply angled ; stamens 12 ; carpels OD, strongly ribbed and beaked. 00 West. 



3 E. piirvulus 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. s or $ $ , in whorls of 3 

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

 cated in bud. Sta. oo. Ovaries very oo, 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 NOB. 1, 3 



* 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. a Fertile pedicels very short No. 4 



x Pedicels subequal Nos. 5, i 



1 8. varlabllls 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 1' broad. Varies exceedingly 

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

 p. obtiixa. Leaves ample ((i 10'). broad-ovate, obtuse. Fls i 5 . M., W., and 8 

 y. lot i folia. Leaves ample, ovate, acute, their lobes ovate, pointed. 

 6. g-r*cillf. Leaves and their spreading lobes long, linear, acute. 

 . pubiHftnn, Plant pubescent all over ; leave? and lobes ovate. 



ft S. calycina Eng. Scape soon procumbent; pedicels all subequal; bracts round- 

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

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



