ALISMACEJE. 249 



remarks in his monograph, " flores polygami (hermapliroditi ct masculini), 

 stamina 9 usque 12 cetera ut in /S r a<7i#an'....Plantn3 submersze fluitantes ; 

 folia longe petiolata, lamina in superficie aquas natans, ovalis basi profundo 

 excersa (laminae Nymphcearum similis) ; flores emersi." Our species exactly 

 agrees with this genus, but for its having invariably hermaphrodite flowers. 

 It may be well inferred, however, that polygamous flowers may be found in the 

 Formosan species when rich collections of the same plant are examined. 



Lophotocarpus formosanus HAYATA sp. nov. Herba aquatica acaulis. 

 Folia omnia radicalia fasciculatim disposita, petiolis 15-20 cm. longis medio 

 5 mm. latis apice valde angustatis 1-2 mm. latis glabris, lamina rotundata vel 

 triangular! circ. 3| cm. longa toiusque lata apice obtusissinia vel rotundata basi 

 profunde cordata, lobis cordis l|-2cm. longis apice acutis vel obtusis vel ro- 

 tnndatis plus minus divaricatis, sinibus cordis latis triangularibus, margine in- 

 tegra membranacea palmati-nervia utraque pagiue glabra subtus pallida minute 

 punctata. Scapi a ccutro fasciculi foliorum oriundi 10-1 5 cm. longi aphylli apice 

 flores umbellatim vel cyniosim 2-3 gerentes. Umbellse (vel cynife) 2-3-florati\3 

 basi involucre suffultn3, involucre tenuiter membrauaceo campanulato 7 mm. 

 longo apice totiusque lato apice 3-4 lobato, lobis triangularibus obtusis ; radiis 

 umbellarum vel pedicellis florum 5 mm. longis validiusculis glabris erectis. 

 Sepala 3 ovata 7 mm. longa 5-6 mm. lata apice obtusissinia basi hand vel vix 

 contracta ad basin 3^-4 mm. lata margine hyalina tenuissima integra glabra. 

 Petala tenuissima post anthesin evanescentia 7 mm. longa cum sepalis requilonga 

 5-6 mm. lata apice late rotundata basi fere rotundata ad msertioneni ^ mm. lata. 

 Stamina 9, filamento complanato 2 mm. longo, anthera adnata oblonga 1 mm. 

 longa apice acuta. Carpella oo, receptaculo 3mm. longo 2i mm. lato ellipsoideo 

 apice obtuso basi hand contracto ; carpello cum stylo 1 mm. longo ; ovario serni- 

 oblongo glabro. Achaenia valde complanata oblique oblonga 3mm. longa 2 mm. 

 lata margine grosse dentata, (dentibus ^ mm. longis mm. latis apice truncatis 

 vel obtusis complanatis), facie paucissime muricata vel sublsevia apice stylo 

 dentiformi truncate oblique coronata ; albumen ; embryo oblique U-formiter 

 recurvus, partibus recurvatis nrme se contactis. 



HAB. Tdyen, leg. S. SASAKI, Sept. 1908; Bidritsu, Taiko, leg. Y. SHIMADA, 

 Aug. 1907, (No 4209). 



