EEVISION OF THE GE.YUS XAJAS. 399 



Auther quadrilocular. 



Leaf-teeth minute ^Y_ inicrodon 9 



Leaf-teeth evident. 



Leaves broad (more than 1 mm.) K punctata, U). 



Leaves narrow (less than 1 mm.) 



Seed minute (about 1 mm. long), ellipsoid. 



Testa with about 10 rows of areolae .... N. microcarpa, \\. 



Testa with about 20 rows of areolae N. Wrightiana 12. 



Seed long (2 mm. or more) and narrow. 



Leaf-teeth few and irregular N. conferta, 13. 



Leaf-teeth numerous and regular N. arquta, 14. 



§ 3. Euvaginatee. — Male flowers only in a spathe. Sheaths truncate or more " 

 or less auricled. 

 Anther unilocular. 



Areola? on testa broader than long iV. minor 15. 



Areolae on testa isodiametric iV. Kurziana 16. 



Areolae on testa longer tlian broad. 



Sheaths rounded, scarcely auricled N. tenuisshna, 17. 



Sheaths with short broad auricles N.gracillima 18. 



Anther quadrilocular (where known). ^ 



Asiatic species. 



Leaf-sheaths large, with broadly overlapping edges . . . , N. Kingii, 19. 

 Leaf-sheaths more or less cylindrical. 



Beak of spathe lacerated N. lacerata, 20. 



Beak of spathe not lacerated, ~ 



Seed more than 2 mm. long N.foveo lata, 21. 



Seed about 2 mm. long N. falciculata, 22. 



Seed 1 mm. long JV. brevistyla, 23. 



Australian species. 



Leaf-teeth minute. 



Sheaths with long auricles iV. temtifolia, 24. 



Sheaths with short broad auricles N. Broumiana, 25. 



Leaf-teeth prominent iV. Leichhardtii, 26. 



Mascarene species. 



Leaves narrow-linear iV. australis, 27. 



Leaves setaceous .V. setacea, 28. 



African species. 



Leaves falcate, teeth exceeding leaf-width iV. horrida, 29. 



Leaves not falcate, teeth not exceeding leaf-width N. interrupta, 30. 



§4. Nudce, — Male and female flowers without a spathe N. graminea, SI. 



§ 1. Spathacece. 



2. Najas indica, Cham. (PL XXXIX. fli?s. 31-45.) 



N. indica, Cham, in Linnsea, iv. (1829) 501 (excluding synonymy) ; Kunth, Enum. iii. 113 (1841) ; 



Hassk. PI. Javan. Rar. 142 (1848). 

 ? N. indica. Griff, ex Voigt, Hort. Suburb. Calc. 694 (1815). 

 N. minor var. indica, A. Br. in Journ. Bot. ii. (1864) 278, in part. 

 N. tenuis, A, Br. ex Magnus, Beitr. p. vii (1870). 



