230 



MEMOIRS OF THE NEW YORK BOTANICAL GARDEN 



[Vol. 9, No. 2 



20. Sagittaria pygmaea Miq. Ann. Mus. Lugd. Bot. 2: 138. 1865. 



Sagittaria sagittifolia var. oligocarpa Micheli in DC. Monogr. Phan. 3: 68. 1881. 



Hydrolirion coreanum H. Lev. Repert. Sp. Nov. 9: 67. 1912. 



Blyxa bulbosa H. Lev. Repert. Sp. Nov. 9: 67. 1912. Nomen nudum. 



Sagittaria altigena Hand.-Mazz. ex. Samuelss. in Hand.-Mazz. Symb. Sin. 7: 1187. 

 1936. Nomen nudum. 



Probably annual. Leaves mostly submerged, rarely emersed, the emersed with 

 linear scarcely distinguishable blades to 3.5 cm long and 0.7 cm wide, their pet- 

 ioles to 15 cm long, the submerged modified into ribbon-shaped, occasionally 

 spatulate phyllodia 8-12 cm long. Scape 10-20 cm long, with 1-3 whorls of flowers. 

 Bracts nearly free, elliptical, 0.3-0.5 cm long. Pistillate pedicels sessile or 

 subsessile, the staminate 1.5-3 cm long. Sepals 0.4-or 0.5 cm long, reflexed. 

 Petals white, nearly twice as long as the sepals. Stamens 9-15, the glabrous 

 subulate filaments ca. 1 mm long, slightly exceeding the oblong anthers. Mature 

 receptacle ca. 0.5 cm in diameter; achenes obovate or nearly orbicular, 1.5-2 x 

 1.2-1.7 mm, the crested, more or less toothed dorsal wing to 0.6 mm wide, exceed- 

 ing the ventral wing, the faces unadorned, the laterally inserted filiform beak to 

 1.2 mm long. (FIG. 4a-c.) 



Type collection: Pierot 72, submerged in rice freld, Kyushu, Japan (holotype 

 Leyden). 



Distribution: Eastern Asia. This dwarf usually submerged annual is apparently 

 fairly common in rice paddies and shallow lakes in warm-temperate coastal re- 

 gions. Collections examined from China, Korea, Japan. (FIG. 4.) 



This unique Old World species is closely related to S. sagittifolia and probably 

 hybridizes with that plant, as is demonstrated by the occasionally collected inter- 

 mediates (5. potamogetifolia Merrill). The toothed-crested achenes and the sessile 

 pistillate flowers are distinctive. 



SPECIES EXCLUDENDAE VEL DUBIAE 



Sagittaria bonaer Larranaga, Escrit. Larr. 2: 258. 1923. Nomen nudum. 

 Sagittaria braziliensis Mart. Syst„ Mat. Med. Veg. Braz. 47. 1843. (= Ecbinodorus.) 

 Sagittaria brevipedicellata Kuntze, Rev. Gen. 3(2): 327. 1898. (—Ecbinodorus.) 

 Sagittaria cerifera Larranaga, Escrit. Larr. 2: 258. 1923. Nomen nudum. 

 Sagittaria cerulea Raf. Fl. Ludov. 18. 1817. Nomen nudum. (= Pontederia.) 

 Sagittaria cordifolia Lam. Encyc. 2: 504. 1788. (—Ecbinodorus.) 



Sagittaria gigantea Vilm. Fl. PI. Terre ed. 1. 759. 1865. (A horticultural form of S. 

 land folia.) 



Sagittaria humilis Kuntze, Rev. Gen. 3(2): 326. 1898. (—Ecbinodorus.) 

 Sagittaria japonica Vilm. Fl. PI. Terre ed. 3. 1002. 1870. (A horticultural form of S. 

 sagittifolia.) 



Sagittaria oblonga Larranaga, Escrit. Larr. 1: 1. 1922. (= Ecbinodorus}) 

 Sagittaria obtusifolia L. Sp. PI. 993. 1753. (= Limnop by ton.) 

 Sagittaria ovi folia Larranaga, Escrit. Larr. 1: 189. 1922. (Not Alismataceae.) 

 Sagittaria palaefolia Nees & Mart. Nova Acta Acad. Leop.~C.arol. 11: 21. 1823. 

 (= Ecbinodorus.) 



Sagittaria potamogetifolia Merr. Sunyatsenia 1: 189. 1934. (Probable hybrid, S. pygmaea 

 X S. sagittifolia.) 



Sagittaria radicans Nutt. Trans. Am. Philos. Soc. 5: 159. 1837. (= Ecbinodorus.) 

 Sagittaria ranunculoides Veil. Fl. Flum. 10. 1827. (— Hydrocleis .) 

 Sagittaria ranunculoides Kuntze, Rev. Gen. 3(2): (= Ecbinodorus .) 

 Sagittaria rostrata Kuntze, v Re v. Gen. 3(2): 1898. (—Ecbinodorus'.) 

 Sagittaria sagittifolia Veil. Fl. Flum. 10. 1827 . (= Ecbinodorus .) 



Sagittaria subulata Klotsch ex Schomb. Faun. Fl. Br. Gui. 1117. 1848. Nomen nudum. 



(= Ecbinodorus}) 

 Sagittaria tenella Kuntze, Rev. Gen. 3(2): 1898. (= Ecbinodorus .) 



