156 



J. O. HAGSTROM, CRITICAL RESEARCHES ON THE FOTAMOGETONS. 



along the whole length up to the middle and above. The interspaces formed by the 

 cross-veins are narrow especially at the middle of the leaf. Margin smooth, base 

 oval to lanceolate, petioles long but shorter than the blades at least below. 



Stem-anatomy : Epidermis with a one-celled pseudo-hypoderma, no or few cortical 

 bundlcs, O-endodermis and 8 free vascular bundles in the central cylinder (trio-type). 



Though \ve cannot give the description of the pistils and fruits, the species 

 however is recognizable by the proprieties stated above. I have hesitatingly distribut- 

 ed the above name to the plant concerned, inasmuch as it in many respects seems 

 to answer to the description of P. sumatranus Miq. When nevcrtheless, according 

 to Miquel's own statement, his species lacks floating leaves and even indications 

 of them, P. hindostanicus cannot possibly be identical with it. Nor with P. indicus, 

 which, like P. sumatr., has the submersed leaves more obtuse, never cuspidate as in 

 P. hindostanicus, ef. Cham., Linn. 1827, 230. See also under P. nodosus! 



Distribution: Asia, Western Himalaya, Kashmir, 56, Schlagintweit (hb. 

 Stockholm.), »no. of Catalogue 4615». Bengal, aug. 68. Leg. S. Kurz (hb. Haun). 



P. Franclietii Ar. Bennett et Baagöe, in Ar. Bennett, Two new Japanese 



Potamogetons, The Journ. of Botany, 1907, 234. 



Fig. 74. 



en<J 



I g. 7* /'. Frän- 

 Benm, .\ Boi . 



Hl H W W.I.. 



I Ti ;hi~\ ' im Bl C- 



tion ni ti,. ,■. ni i al 

 dei "ii ii' lattor, 

 .,./. endodi 

 /.' Pi ni, m.Ii yiew, 

 ',", •■iiiil C, Stigma, 

 ii "in abo\ ■ ',"• "' 

 /■ Frän, '■■. l>. Froit, 



■■■ , /'. ihj I. 



This species seems to be profusely spread in East Asia, together 

 with P. perversus Ar. Benn., which is P. digynus Wall. and /\ elegans 

 Wall.. They differ from one another in the following way : /'. Fran- 

 cheUi: Upper leaves broader, 15 — 17-ner ved, more obtuse; stigma, see 

 fig. 74, B, C ; fruit with lateral bosses upwards. i\ digynus (perversus): 

 Leaves narrower, 13-nerved, more acute, much as the shape of the 

 fig. 77, B; stigma more rounded; fruit without pectoral bosses (fig. 



74, D). 



Stem-anatomy: epidermis lacking strands and pseudo-hypoderma, 

 no bast- or vascular bundlcs present in the cortex, cudodcrmis of 

 O-cells (7\ Franclietii), or O-cclls with more or less conspicuous »-cells 

 intermixed at intervals (P. dig.). Central cylinder of trio-type in both. 



Distribution. P.dig.: Korean Archipelago, 1863, coll. R. Oldiiam 

 (hb. Stockholm). Nepalia, WäLLIOH 5177, Singapor, W ALL. 5178, — P. 

 Franchetii: Japan, Yokohama, 1862, MäXIMOVIOZ (hb. Stockholm), 

 Tokio, Hirumushiro and Yokoska, Nippon, Franchet (hl). Haun.). 



I*, aplcalls n. s|>. 



Oaulis ca. 3 dm. v. ultra, teres, crassus (3 mm. in diam.) dense aigripunctatus, 

 nodis annulatue, internodiia mediooribus (summo ea. 6 cm.), simples v. ramis 1:sb— 2:se 

 ordinis prolongatus, Folia (late) lanoeolata, oorjacea (infima?) longe petiolata, summa 



