XVKIIMI U.] 



\ -i RI DALES. 





Alliance XIV. XYRIDALES. -Tire Xyridal Ai: 



Diagnosis. Hypogynoxu tripetalo 



It i-. in this Alliance that, among Endogena with :i free "\ ory, the first dutio 

 ii"ii i Ua from the calyx takes place, in ill" form "t 



• Bsentia] chin acter of the Alliance is its tripetaloideous condition. In the .. 



thai circnmstai it is not t" be distinguished from Juncals <>n the one hand, or I 



on the oilier. The W aterworta | Philydraceoa) Beeui to have anticipated the ■■ 



eous organi :ation by forming petals before sepals, and hence the) present th< anomaly 



of a flower with a verj conspicuous corolla having no calyx, th<- oflice "i which a; . 



to I" |" rformed by Bpathaceous bracts. Xyrids resemble Sedges with a corol 



no doubt akin tn Pipeworts (Eriocaulaceae). Spiderworts are ai 



among Dictyogens, and as for the Mayacs tliey may l»- compart 'I v< !.• ptanth 



PontederaSj or to Potamogeton among the Arrow-grassi b. 



\ . 1 1 ral Orders 01 Xi rid 



Sepals 0. Petals 2. Stamens 3, of which 2 are abort I . ,,.,,. 



axile, tn fleshy albumen 



Sepals 3. Petals .'!. Stamens 3 fertile. Carpel pals. 1.. y 



Placenta parietal. I ■ \mimUe,ontfu outsxdi of fleshy albumen j 



& /»'/•< 3. l'< tals 3. 



.Mill' 



itit axile. Embryo 



ill I'll nan 



trochlear, half immersed in 



• 



lit 3. Petals 3. Stamens Z ; (antht Ued) 



opposite petals. Placenta parietal. Embryo mi 

 outtidt of fleshy albumen 



/). Carpels I 

 nute, on Uu I . 



7. Mayj 



