Myriophyllum. HALORAGE^. 215 



small and short ; styles or sessile stigmas 2 to 4 and distinct, or in Ilippuru only 

 one and sinii)le. 



All the higlily developed representatives of this small order are in the southern hemisphere 

 tlmn i„ Uie i'aoili'c sSteT ' '^ '' '"'"'' '^ """ ^'^"^^ "'' '""''' '""'■' "^merous in the Atkntic 



Callitiuciie as well as CEUATOPiiYLt,UM is referred to the Apctalcc. 



1. Hippuris. Leaves linear, in whorls of 8 or 12. Flowers perfect. Calyx entire Petals 



none. Stamen and cell of the ovary one. j . i t-tais 



2. Myriophyllum. Inimnrscd loaves pinnatoly dissocto.l. Flowers nioncrcious or iiolyKamoua 



Tarts ol the llowcr in lours. * *^* 



1. HIPPURIS, Linn. Maue's Tail. 

 Flowers perfect or sometimes polygamous. Calyx-tube globular; the limb entire. 

 Petals none. Stamen 1; filament subulate; anther large. Ovary 1 -celled : style 

 becoming filiform and elongated, stigmatic the whole length. Fruit oblong-ovoid, 

 nut like. — Smooth aquatic perennial herbs, with erect simple leafy stems ^ leaves 

 linear or oblong, entire, in whorls of 4 to 12; flowers minute, solitary and sisile in 

 the axils of the leaves. 



rp^ry ^r'n 'P'"?, '""'^ known or perhaps only one, distributed through the temperate and colder 

 regions of the northern hemisphere and also in the soutliern. 



nc:,!:ii?;T\?w"®' ■^•""i ,^^'"^' " ^""*' °' ^^^"^ '"■"^'' '•■'^<'^'^'' «tout: leaves acute, 

 usually a halt to an jnch long but often much longer, especially the submerged 

 ones: cayxhanlly hall a hue h.ng : stylo and stamen comparatively conspicuous 

 persistent : fruit nearly a line long. ^ i . 



fool" ulf"?'" T"*'' ' TrT''? ^^%iJ^>9''Jfw, Pnlandcr) ■ Soda Springs, near Mono Pass, at 8,600 



Old Woild), and southward in tlu- Rocky Mountains as far as New J\lexico. 



2. MYRIOPHYLLUM, Linn. Water-Milfoil. 

 Flowers monoecious or polygamous. Limb of the calyx 4-lobed in the sterile 

 flowers, wanting or minutely toothed in others. Petals 2 to 4, minute or wanting 

 in pistillate llowors. Stamens 2 to 8 ; filnnuMits fl]ir.,rm. Ovary 4-c('llo(l : stigmas 

 4, recurved and plumose. Fruit nutliko, deeply 4-lobed longitudinally. — Smooth 

 aquatic perennial leafy herbs ; leaves mostly verticillate or opposite, the submersed 

 ones pinnately parted with capillary segments ; flowers small, solitary and mostly 

 sessile in the axils of the reduced upper leaves, the upper ones usually staminate, 

 tho lower i)iatillate, and tho intermcdiato ones perfect. 



bei^ifrcfiuirthS XitS'sSef "^^"^ ''^^^ "''^■■^^ "- '-'-'^ ^^"»-' «- '-'' «f '^^ --^^ 



1. M. spicatum, Linn. Leaves in whorls of 3 or 4, all l)elow the inflorescence 

 pinna ely parted ; the filiform segments often an inch long : flowers in an inter- 

 rupted spike: bracts ovate, entire or toothed, usually shorter than the flowers- 

 petals ovate, greenish white, nearly a line long, .leciduous : stamens 8 : fruit sub- 

 globose, deeply lobed ; tho rounded carpels smooth, a line long. 



wnwfl'^'^ri^ \" California {Kdlogcj), but locality not given ; Washington'rerritorv {Lyall), north- 

 ward to A Inslca and enstwnid across Iho continent. Also in K.urope nn<l Asia. TbeVerv similar 

 M. vrrtmllatmn, Linn,, is distinguishml by tl.o larger and pcctinatdy pinnalind iloial bVncU. 



2 M. hippuroides, Nutt. Leaves in whorls of 4, tho lower pinimto nnd 

 capillary; u])p(T leaves linear, acute, acutely and rather reniotolv toothed, 3 to 6 

 lines long, tlie uppermost nearly entire: petals white, obovate, somewhat persistent: 



