Nymphaeaceae 



437 



1. Nuphar japonicum DC. Ko-hone. Fig. 5. Rhizomes 

 stout, creeping; leaves radical, the submersed ones narrow, 

 membranous, with undulate margin, die aerial ones subcoria- 

 ceous, narrowly ovate to oblong, 20-30 cm. long, 7-12 cm. wide, 

 obtuse to rounded, sagittate, glabrous above, slighdy pubescent 

 beneadi while young, entire; peduncles raised above the water; 

 flowers yellow, 4-5 cm. across; sepals obovate-orbicular, about 

 2.5 cm. long, subcoriaceous, becoming green in fruit, rounded 

 at apex; petals obovate-cuneate, about 8 mm. long; anthers 4-6 



mm. long; stigma-disc 6-8 mm. across, dentate. June-Sept. 



Ponds, lakes, and shallow streams; Hokkaido (sw. distr.), 

 Honshu, Shikoku, Kyushu; common. 



Var. rubrotinctum (Casp.) Ohwi. N. japonicum var. sub- 

 integerrimiim forma rubrotinctum Casp.; N. subintegerrimum 



forma rubrotinctum (Casp.) Makino Beni-k6-hone. 



Flowers orange-red. Known only in cultivation. 



2. Nuphar subintegerrimum (Casp.) Makino. ]V. ja- 

 ponicum var. subintegerrimum Casp. Hime-ko-hone. Re- 

 sembles the preceding; floating leaves broadly ovate, 4-8 cm. 

 long, 5-8 cm. wide; flowers 3-4 cm. across; sepals 15-20 mm. 

 long; anthers 3-5 mm. long; stigma-disc 4-5 mm. across, shal- 

 low-toothed; stigma broader, contiguous below. June-Sept. 



Honshu, Shikoku. 



3. Nuphar oguraense Miki. Ogura-ko-hone. Rhi- 



zomes stout; floating leaves broadly ovate to ovate-orbicular, 

 5-8 cm. long, 4-6 cm. wide, rounded, deeply cordate-sagittate 

 at base, entire, the petioles flattened, slightly hollow; flowers 

 yellow, 3-4 cm. across; sepals obovate, about 2 cm. long; petals 

 broadly spathulate, about 6 mm. long, shallowly refuse; anthers 

 2-2.5 mm. long, oblong; stigma-disc 6-7 mm. across, shallowly 



dentate. July. Ponds and shallow lakes; Honshu (w. distr. 



and westw.), Kyushu. 



4. Nuphar pumilum (Timm) DC. Nymphaea lutea var. 



pumila Timm; N. subpumilum Miki Nemuro-k6-hone. 



Rhizomes stout, creeping; floating leaves broadly ovate to 

 ovate-orbicular, sometimes elliptic, 6-8 cm. long, 6-9 cm. wide, 

 the petioles slightly flattened; flowers about 2.5 cm. across, yel- 

 low, floating; sepals broadly obovate or broadly elliptic, 12-20 

 mm. long, rounded at apex; petals spathulate-obovate, 5-7 

 mm. long, rounded at apex, often obsoletely toothed; andiers 

 elliptic, 2.5-3 mm. long; stigma-disc 6-8 mm. across, pale 



yellow or partially reddish; stigma-disc 10-20 mm. across. 



July-Aug. Ponds and shallow lakes; Hokkaido (e. distr.), 

 Honshu (n. distr.). Europe to Siberia. 



Var. ozeense (Miki) Hara. 2V. ozeense Miki Oze-ko- 



hone. With dark red stigma-disc. Honshu (Oze in 



Kotsuke). 



3. EURYALE Salisb. Onibasu Zoku 



Large, prickly, acaulescent aquatic annual herb; leaves floating, orbicular, rugulose especially while young, prominently 

 nerved and net-veined beneath; peduncles radical, 1-flowered; flowers rose-purple; sepals 4, united below into an ellipsoidal 

 tube; petals many, smaller than the calyx-lobes; stamens many, inserted on the inner side of the petals, all fertile, the filaments 

 short, the anthers oblong, the connective truncate; ovary inferior, the 8 carpels syncarpous; stigma discoid, depressed, the margin 

 adnate to the inner wall of the receptacle; ovules few in each locule; fruit berry like, spongy, densely prickly, irregularly de- 

 hiscent; seeds with endosperm. One species. 



1. Euryale ferox Salisb. Onibasu. Leaves peltate, 



long-petioled, orbicular, lustrous above, purplish and short- 

 pubescent beneath, 30-120 cm. across, flat, subentire, slightly 

 emarginate at base; calyx-lobes 15-20 nun. long, narrowly 

 deltoid, subacute to obtuse, persistent, erect in fruit; petals 

 broadly lanceolate or oblanceolate, 6-10 mm. long, obtuse; 



anthers 3-3.5 mm. long, the filaments unequal in length; fruit 

 ellipsoidal or subglobose, 5-7 cm. long, beaked; seeds sub- 

 globose, about 1 cm. across, with a fleshy aril. Aug.-Oct. 



Ponds and lakes in lowlands; Honshu, Kyushu. India, 



China, and Formosa. 



4. NYMPHAEA L. 



SuiREN Zoku 



Perennial aquatic, acaulescent herbs with bulbous or stout short-creeping rhizomes; leaves orbicular, cordate-sagittate, basifixed 

 or peltate; peduncles 1-flowered; flowers white, blue, rose or yellowish; sepals 4; petals many; stamens many, the outer filaments 

 often petaloid, the anthers introrse; ovary syncarpous, the carpels many, adnate below to the receptacle; styles free, short, the 

 stigma linear; fruit spongy, irregularly ruptured; seeds with endosperm. Cosmopolitan, with about 50 species. 



1. Nymphaea tetragona Georgi var. tetragona. N. 



tetragona var. lata Casp.; N. pygmaea (Salisb.) Alton; Castalia 



pygmaca Salisb. Ezo-no-hitsujigusa. Rhizomes stout and 



fleshy; leaves long-petioled, ovate-orbicular to ovate-elliptic, 

 5-12 cm. long, 8-15 cm. wide, basifixed, entire, rounded, 

 deeply cordate-sagittate; lobes of leaves shorter than the length 

 from the attachment of petiole to apex, the inner margin often 

 overlapping; petals usually 8, white; sepals green, broadly 

 lanceolate to narrowly ovate, 3-3.5 cm. long, 10-15 mm. wide, 

 subacute; outer filaments broadly oblanceolate, the inner ones 



nearly linear, 3-5 mm. long, the connective not produced 

 above; fruit ovoid-globose, covered by the persistent calyx. 

 — — July-Oct. Ponds and shallow lakes; Hokkaido, Honshu, 



Shikoku, Kyushu. e. Siberia, Manchuria, China, Korea, 



India, and N. America. 

 Var. angusta Casp. N. tetragona var. angusta subvar. 



orientalis Casp. Hitsujigusa. Lobes of leaves longer than 



the length from the attachment of petiole to apex, with more 



or less distant inner margin; petals usually 12-15. Ponds 



and lakes at low elevations; Honshu, Shikoku, Kyushu. 



5. NELUMBO Adans. Hasu Zoku 



Coarse acaulescent, aquatic herbs; rhizomes long-creeping; leaves long-petiolate, raised 1 m. or more above water, orbicular, 

 peltate, radiately nerved; peduncles radical, elongate, 1-flowered; flowers deep pink, white or yellowish; sepals 4 or 5, free, cadu- 



