Elatinarum Monographiu. 



1. Forma terrestris pygmaea = forma terrestris 



Schimper! Tab. nostr. V. Fig. 2. 

 Caules subsimplices, abbreviati, %-\%_ uncias longi, repentes, 

 ascendentes; folia lanceolato-linearia, terna ad sena, internodio lon- 

 giora; flores solitarii. — In solo plane exsiccato. Individua in solo 

 non plane exsiccato crescentia plerumque ad sequentem formam 

 pertinent. 



2. Forma aquatica Tab. nostr. V. Fig. 1. 



Caules ramosi, ramis alternis ascendentibus, suberectis, ex geni- 

 culis infimis radicantes; folia emersa terna, ovato-lanceolata, in verti- 

 cillis imis emersis quaterna, quina vel sena, lanceolata, submersa sena 

 ad quindena, lanceolato-linearia vel lineari-subulata, elongata, uniner- 

 via, infima lere capillaria, omnia internodio longiora; flores verticillo- 

 rum emersorum terni, submersorum paucissimi. — In aqua plus mi- 

 nus profunda. 



3. Forma fluitans Tab. nostr. V. Fig. 3. 



Caules simplices, elongati, debiles, fluitantes; folia ima linearia, 

 media lineari- lanceolata, summa lanceolata, omnia internodio bre- 

 viora; flores solitarii. — In aqua fluitante. 



Habitat in stagnis, lacubus fossisque Europae mediae. In Rume- 

 lia legit Friwaldsky!, in florae germanicae ditione provenit in Austria, 

 ßohemia, Silesia!, pr. ßerolinum!, Lipsiam!, Erlangam, Coloniam, ad 

 Rhenum superiorem in flora badensi pluribus locis!, in Alsatia!, pr. 

 Augustam Trevirorum; in Belgia (Lejeune); in Gallia (Vaillant, La- 

 marck, De Candolle). — 0 (an 2j?) Flor. Iul.-Sept. 



Caules basi ramosi ibique radicantes, cum ramis erecti, crassi, 

 stricti, teretes, glaberrimi, sulcis 10-15 leviter impressis; in sectione 

 transversa (Tab. nostr. V. Fig. 6) apparet fasciculus vasorum simplex 

 medianus, cellulis fibrosis circumdatus quem cingit cortex crassissimus, 



Vol. XXI. P. I. S 



