— 98 — (6) 



FI. 182?) » we are making the autkors say, what they do not say. 

 Conf. Trinien, Jour, oj Botany 289, 1879: Ar. Bennett 1. c. 

 263, 1889. 



6. Potamogeton sp. — Sumatra II, n°377S. Zollinger. — In 

 FI. Ind. Batavœ. Miquel in his Prod. FI. Sumatrcuue 259, 597, 

 1860 l discribed a Potamogeton as P. sumatranus. 



I bave noven been able to see a type spécimen oftnis. The ori- 

 ginal spécimens were gathered by Teysmaun «in lacu Singkara ». 

 A spécimen from Zollinger n° 1659 « Padang Pandjang» in the 

 Vienna herbarium I doubtfully referred to Miquel's species. 

 The Delessert sp. may be the same, though the spécimen has the 

 upper leaves somewhat shaped like fioating leaves; while Miquel 

 says « wholly submerged » and also « fruit inconnu» and speaks 

 of his plant « par les feuilles longuement petiolées du groupe de 

 P. natans, oblongues etc. », but if the Yienna spécimen is really 

 sumatranus, the leaves looked to me more the texture of P. lucens. 



R.aunkaier seems to hâve had a spécimen to examine as 

 he gives its anatomical structure and classes it with P. malianus 

 Miq. (= P. mucronatus Presl.) with the note « if fioating leaves are 

 produced it will hâve to he united with the amplifolkis group. » 

 Is this not very much the resuit of the Batrachium (Ranunculus) 

 spliting, where spécimens in May without fioating leaves received 

 one name, and with them in July another. If two spécimens at 

 the Kew Herbarium really belong to maliana (or a nov. sp. ?) 

 then it does produce fioating leaves, but there are no fruit on 

 thèse spécimens, and fruit of maliana is so characteristic it 

 could not be mistaken 2 . 



7. P. heterophyllus Schreb. 



Tw r o remarkable forms of this are contained in the collection. 



M r Nelson's n° 6061, 1899, from the Yellowstone Nat. Park.: 

 and C. F. Baker's n° 427 from the Gunnison Watershed of 

 W. Central Colorado. Though they undoubtedly corne under 

 this species, they represent rare forms of the species 



8. P. pensylvanicus Cham. ! in Linn. 2, 1827 == 

 P. pumilus Wolfg. in Rœm. et Schul., S?js. Mant. 3, 354, 1827 



1 Also m IU. FI. Arch. Ind. 46, 1871. 



2 Morong in Bull. Torrey. Bot. Club. 13, t. o9, 1886. 



