KtTNGL. SV. VET. AKADBMIENS HANDLINGAE. BAND 55. N:0 5. 



263 



P. dimorphus Raf. x pusillus L. (P. dimorplioides n. hybr.). 



Pot. ad ramificationem P. dimorpho similis. Pedunculi elongati ut in P. pu- 

 sillo. Folia omnia submersa forma structuraque intermedia. 



The ramification of this plant is like that of P. dimorphus. Leaves interme- 

 diate. Lateral nerves very faint. Ligules open, 6-fibrous in the front-field. Pedunc- 

 les like those of P. pusillus. Spikes small. — Gathered by T. Moeong, 81 (hb. 

 Haun.). 



As to the distribution of P. gramineus X nutans (p. 219) two more localities 

 may be added, viz. Norway: Senjen isl., 63, Norman, 10, NoTO (hb. Christian.), and 

 Hvaloerne: Kirkeo at Bobakke, 42, Printz (hb. Christ.). — 



P. nericius (p. 145) occurs in Iceland, Reykhult, 76, Gronlund, Reykjavik, 

 95, OsTBNFELD HANSEN (lib. Haun.). 



p. Torssandri (p. 216) has been gathered in Norway, Frosta, Liavand, 14, by 



I. JORSTAD. — 



The most northern habitat of P. polygonifolius Pourr. hitherto known is Vest- 

 vagoen in Norway, where it has been gathered by J. M. Norman in 1878 (hb. 

 Christian.) — 



I will lastly give a brief summary of the groups and the number of the spe- 

 cies and hybrids belonging to each of them: 



Groups 



Species Hybrids 



Groups 



Species 



Hybrids 



1. Filiformes . . 



2. Amblyophylli . 



3. Vaginati . . . 



4. Pectinati . . . 

 P. liivingstonei 



5. Serrulati . . . 



6. Crispi . . . . 



7. Compressi . . 



8. Monogyni . . 



9. Ochreati . . . 



10. Polygoni . . . 



11. 0.\ypliylli . . . 



12. Monticoli . . . 



13. Pusilli . . . . 

 P. ui'uguayensis 







4 



2 



1 



— 



3 



— 



1 



1 



1 



— 



2 



1 



1 



3 



2 



2 



1 



1 



2 



— 



3 



— 



5 



— 



1 



— 



19 



14 



1 



— 



P. Curtissi 



14. Javanici 



15. Hybridi 



16. Alpiui . 



17. Amplifolii 

 P. Thuiiber 



18. Muricati 



19. Sclerocarpi 



20. Colorati 



21. Nodosi 



22. Natantes 



23. liUcentes 



24. Prailongi 

 25 PerfoHati 

 2(i. Densi . 



1 

 9 

 6 

 2 



22 

 1 

 8 



7 





6 



2 



1 



2 



4 



3 



19 



17 



1 



— 



3 



3 



1 



— 



