— 81 — 



c) P. exannulatum — P. hydropiper X mite Figert in Allg. bot. Zeit. (1895), 29 

 forma 1. — Magis P. Jnjdropiper contingit, sed annulus fusco-sanguineus sub ochreis deest. 

 Ochreae breviter ciliatae, subglabrae. Perianthium roseum, i^arce glandulosum. Substerile. 



Germania: Silesia (Breslau, Liegnitz 1. Figert.) 



P. duhio-hydropiper Greu. Godr., 1. c, 50 iniperfecte descriptum, racemis terminalibus 

 pendulis, axiilaribus autem arcuato-uutantibus excelli traditur. 



16. Polygonum hydropiperx persicaria — a) P. intercedens — P.persicariax hjdropiper 

 Figert in Jahresb. Schl. Ges. (1896) 44. Sep. Abdr. 6. Internodia sub ochreis rubrofusco- 

 annulata. Ochreae longe cihatae. Folia maculata. Racemi sublongi, tenues, laxiflori. 

 Perianthium roseum, obsolete glandulosum. 



Germania: Silesia (Liegnitz, 1. Figert), Hannover (Mejer f. Focke); Helvetia 

 (Villeneuve 1. Papon f. Gremli); Gallia: Ardeche 1. Personnat. 



17. Polygonum lapathifolium x minus — a) P. Hervieri — P. sfricfo x lapathifolium 



Lange in Hervier, Rech. fi. Loire, I (1885), 44. — P. lapathifolium X minus Figert in Jaliresb. 

 Schles. Ges. (1888) 176 et in Allg. bot. Zeit., I (1895), 30. — A basi valde ramosum. 

 Ochreae breviter ciliatae. Folia anguste vel Hneari-lanceolata, basi subabrupte attenuata. 

 Racemi elongati, angusti, basi interrupti, densiores quam in P. minore. Flores et fructus 

 minores quam in P. lapafhifolio et majores quam in P. minore. 



Gallia: Veauche (Loire) inter parentes 1. Hervier; Germania: Silesia (circa Lieguitz 

 1. Figert); Helvetia: (Genf, f. Wilms). 



18. Polygonum lapathifolium x mite — a) P. siiesiacum — P. lapathifoVmm x mite 

 Figert iu Jahresb. Schles. Ges. (1889), 165 et in AHg. bot. Zeit. (1895) 30, 68. Caulis as- 

 cendens v. erectus, infra paulo rubropunctatus cum internodiis incrassatis. Ochreae breviter 

 ciliatae et appresse pilosae. Folia breviter petiolata, lanceolata, utrinque longe attenuata, 

 maculata, infra dense glanduloso-punctata, ea Polygoni lapafhifolii aequantia sed minora. 

 Racemi elongati, graciles, angusti, lasiflori, basi interrupti, iis Polyyoni mitis similes. Perianthium 

 cum pedicellis eglandulosum, albidum v. roseum. Fructus steriles. — Etiam forma ochreis 

 longius ciliatis observata est. 



Germania: Silesia (Nieder Royn, Bischdorf, Wahlstatt prope Liegnitz, Liebenau L 

 Figert.) 



b) P. digeneum — P. lapathifoUum X mite Wilms in Beckh., Fl. Westf., 772 (1893). 

 Caulis inteniodia paulo tumida. Ochreae sublonge cihatae. Folia infra interdum parce 

 glanduloso-punctata, superiora angustissima (ut in p. lapafhifolio). Racemi aggregati, inter- 

 dum crassi sed interrupti. Perianthium paulo minus quam in P. miti. Sec Beckhaus forsan 

 forma Polygoni persicariae. WestfaHa. 



P. hicolor {tomentosum X mife) Borbas in Ost. bot. Zeit. (1878), 392 ex Hungaria (Rakos 

 prope Budapest) descriptione caret. 



19. Polygonum lapathifolium x persicaria — P. persicaria x lapathifolium Figert in 

 AUg. bot. Zeit. (1895), 30 in Silesia prope Liegnitz repertum descriptione caret! 



20. Polygonum minus x mite — a) P. Wilmsii — P. mimis x mite Wilms f. Uechtr. 

 in Jahresb. Schles. Ges. (1877), 176. — P. mifiXminus Wilms in Beckh., Fl. Westf., 773. — 

 P. minori-persicaria Wilms, ibidem. Habitus Pohjgoni mitis, firmior quam P. minus. Folia 

 P. minoris sed majora oblonga vel oblongo-lanceolata, — 11 cm longa et — 2 cm lata. Flores 

 P. mitis, sed paulo minores. Nuces trigonae, nitentes, punctatae, c. 3 mm lougae. 



IcoD. Fl. Germ. XXIV. (Autore Beck). H 



