139 



be placed close to ths Proteales at one time, but brought near the Rhamnales 

 at another. 



Then, ENGLEE refers to the Aristolochiales'-'. Tliis series must certainly 

 be directly related to the Metachlamydese when the prominence at the apex 

 of the inferior ovary of Anstoloclda is, as I should think proper, taken for a 

 reduced calyx and the gamophyllous perianth is, as a consequence, regarded 

 as a corolla. Further, it is related to the Sarraceniales, as can be seen from 

 the agreement in the Arisfcolochiacese and Nepeuthaceoe^ in the perianth, 

 in the extrorse anthers, in the many-seeded carpels and in the lobes 

 of the stigmata. Moreover, the resemblance of tin's series to Rauales' * 

 is undeniable, as the extrorse anthers, placentas, seeds, and secretory-cells are 

 found in some families of both series. The natural position of the Aristolo- 

 chiales can not be fixed here. It should be in some place among the 

 Metachlarnydeae at one time, but at another time among the Archichlamydese 

 near to the Kauales or the Sarraceniales. 



Then follow the Polygouales 4) . As to this series, we know but little 

 about its relation to others. As far as we are aware, it is related to the 

 Centrospermse, as some analogous points are found in the Polygonaceae and 

 Amarantacese'" . 



After explaining the portions of his system thus far referred to, ENGLEE 

 state 1 ' :- 



Wenn oben gesagt wurde, class einzelne Eeiken morpkologiscke 

 weiter vorgesckritten seien, als andere, class andererseits gewisse 

 Reiken, wie z. B. die Faf/ales und Urticales a\if der gleichen morpko- 

 logiscken Stuf e stelien, so istdennocli eine jede der genannten Keihen 

 als eine selbstandige Pf lanzengrtippe anzuseken, welcke in keiner 

 Weise von einer der anderen abgeleitet werden kann. Ebenso wenig 

 ist irgend welcker Grund zu der Annahme vorhanden, class eine 

 dieser Eeihen der Ausgangsptinkt fur eine der folgenden Keilien 

 g ewe sen ist. Finden sick in den Reiken Fornien, welcke einen niikeren Ansckluss 



1) ENGLEU, A. Erl-interungen, 1. c. p. 363. -.2) Nat. Pfl.-fam. III. 2, p. 259. 



3) WETTSTEIN, E. E. 1. c. p. 555. 4) ENGLEB, A. Erliiutemngen, 1. c. p. 364. 



5) Nat. Pfl.-fam. III. 1, a, p. 8. 6) ENGLEE, A. Erlauternngen, 1. c. p. 364. 



* Tke relation also exists between the AristolockiaceEe and Nymphaeacese, as can be seen in 

 tke serum-reactions in tke botk families. Cf . MEZ, C. and LANGE, L. Serodiagnostiscke Unter- 

 suckungijn iiber die Verwandtsckaft innerkalbe der Pflanzengruppe der Eanales (Beitr. z. Biol. cl. 

 Pflanzen, 12. pp. 218222). 



