ALISMACE^E. 249 



remarks in his monograph, " flores polygami (hermaphroditi et masculini), 

 stamina 9 usque 12 cetera ut in Sagittaria....~Pl&ntse submersae fluitantes ; 

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

 excersa (laminae Nyiwphceantm 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 obtusissima vel rotundata basi 

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

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

 tegra membranacea palmati-nervia utraque pagine glabra subtus pallida minute 

 punctata. Scapi a centre fasciculi foliorum oriundi 10-15 cm. longi aphylli apice 

 flores umbellatirn vel cyinosim 2-3 gerentes. Urnbellse (vel cymee) 2-3-florato3 

 basi involucro sufMtcis, involucre tenuiter membranaceo campanula to 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 obtusissima basi haud vel vix 

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

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

 5-6 mm. lata apice late rotundata basi fere rotundata ad insertionem \ mm. lata. 

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

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

 apice obtuso basi haud contracto ; carpello cum stylo 1 mm. longo ; ovario semi- 

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

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

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

 dentiformi truncato oblique coronata; albumen 0; embryo oblique U-formiter 

 recurvus, partibus recurvatis firrne se contactis. 



HAB. Toyen, leg. S. SASAKI, Sept. 1908 ; Bioritsu, Taiko, leg. Y. SHIMADA, 

 Aug. 1907, (No 4209). 



