320 WATEK-1'LAXTAIX FAMILY. 



3. AF.ISMA. Flowers perfect, loosely panicled. Petals involute in the bud 



Stamens 6. Ovari.-- many, in a ring, very flat ided, becoming coriaceous 

 flat nkeiie.. l! - ;j-kfeled mi the bark. 



4. KCIlIN'oDolM'S. Flowers perfect, in proliferous umbels. Petals imbricated 



in the bud. Stamens y or more. Ovaries heaped in a head, becomim: wino-- 

 less akenes. 



6. SAGITTARIA. Flowers monoecious, rarely dioecious or polygamous, in suc- 

 cessive whorls, the ,-terilc at the summil of the scape; the inwe-t fertile. 

 Stamens usually numerous. Ovaries verv many, heaped ou the globular 

 receptacle, in fruit becoming Hat and winged akenes. 



III. FLOWERING-RUSH FAMILY. (BUTO..IE.E.) Dif- 

 fers from the preceding mainly in the few ovaries haviug numerous 

 ovules distributed all over the inside. 



6 LIMNOCHARIS. Flowers perfect, long-peduncled. Petals large, vellow. Sta- 

 mens numerous with slender filaments, a few of the outermost without an- 

 fliers, the rest with linear anthers. Ovaries 6 or more, somewhat united at 

 base. Leaves roundish and heart-shaped, long-petiolcd. 



1. TRIGLOCHIN, ARROW-GRASS. (Name in Greek means three- 

 pointed.) Insignificant rush-like plants, in marshes, mostly where the wa- 

 ter is brackish : tl. summer. ^ 



T. palustre. Slender, 6' -18' high, with linear-club-shaped ovary and 

 fruit, the 3 pieces when ripe separating from the sharp-pointed base upwards 



T. maritimum. .Stouter, 12 ( -20' hi-h, with fruit of about 6 pieces 

 rounded at base. Var. I:I,\TITM, in bogs of the interior, N., 20' -30' hio-h the 

 pieces of the fruit sharp-angled on the back. 



T. triandrum, a small slender species along the coast S., has onlv 3 

 sepals, no petals, 3 stamens, and a 3-lobed fruit. 



2. SCHEUCHZERIA. ( Named for the early Swi>s botanist, Schcuchzer.) 



5. palustris. Peat-hogs from IVnn. N. : 1 high : fl. early summer. ~U 



3. ALISMA, WATER-PLANTAIN. (The old Greek name, of uncertain 

 meaning.) Kl. all late summer. 



A. PlantagO. Shallow water : leaves lonjr-pctiolcd, varying from oroblon-- 

 heart-shaped to lancedlate, 3- 5-ribbed ; panicle l-2 lonj} of verv maiiv ami 

 loose small flowers. ^ 



t. ECHIN6DORUS. (Named probaV>ly from Greek words for prickly 



Jlnxk, the liead of fruit beiny as it were prickly-pointed by the styles, but 



hardly so in our species. The following occur in' muddy or wet places, chiefly 



W. i!t S : fl. summer ; the flowering shoots or scapes mostly proliferous and 



creeping. 



E. parvulus : a tiny plant, l'-3' high, with lanceolate or spatulatc leaves, 

 few-flowered umbels, '.) Mamens, and almost pointless akenes. i 



E. rostratUS, with broadly heart-shaped leaves (l'-3' long, not including 

 the petiole') shorter than the erect scape, winch bears a panicle of proliferoiis 

 umbels; flower almost ' wide; 1^ stamens; akenes beaked with slender 

 styles. i 



E. radicans, with broadly heart-shaped and larger leaves (3' - 8' wide) 

 which arc very open or almost truncate at base ; the creeping scapes or stems 

 becoming l-4 long and hearing many whorls ; flowers },' -\' broad ; akenes 

 short-beaked. 



5. SAGITTARIA, ARROW-HEAD (From the Latin for mroic, from 

 the sagittate leaves which prevail in the genus. In shallow water : fl. all 

 summer. ^ 



* Filaments lonq and slender, i. e. as lon<i <m tin* Hnear-oMong anthers. 



S. lancifblia. Common from Virginia S. : with the stout leaves l-3 

 and scapes 2 - 5 high, the coriaceous' blade of the former lance-oblong and 



