570 CLXX. NAIADACE^;. (J. D. Hooker.) \JNaias- 



INDETERMINABLE SPECIES. 



N. TENUIS, A. Br. (not Z. tennis, Reut. Cat. Jard. Gener., 1854) is a plant 

 from Behar alluded to by Magnus in his " Beitrag. Gatt. Naias," Vorwort, p. vii., 

 and refers probably to a form of N. minor as above diagnosed. 



N. IIETEROMORPHA, Griff, ex Voigt Sort. Suburb. Calcuit. 694. A Serampore 

 specimen so named in Herb. Kew, by Griffith, has a very long laxly leafy stem, the 

 long toothed leaves have no auricles, or most minute toothed ones. It is not in 

 flower or fruit. 



N. RIGIDA, Griff". Notul. iii. 181. I cannot identify any Indian species with 

 this. It is a native of Serampore, described as blackish greeu when dry with fleshy 

 rigid leaves. Some specimens included under N. minor answer to the colour. 



7. CVMODOCEA, Kcenig. 



Submerged marine plants ; rootstock rigid, jointed, creeping. Leaves 

 oblong or linear ; sheaths stipular. Flowers axillary, uni- or bi-sexual, 

 in membranous sheaths. Perianth 0. MALE FL. Anthers 2, elongate, 

 connate, stipitate, slits extrorse ; pollen confervoid. FL. FEM. Carpels 2, 

 subsessile, ovoid, compressed, 1-ovuled ; style short, stigmas subulate 

 recurved ; ovule pendulous, orthotropous. Fruit of 2 ovoid coriaceous or 

 woody and externally succulent carpels. Seed pendulous ; testa thick ; 

 embryo inflexed. Species 4 or 5, Indian and Pacific Oceans. 



As this sheet was passing through the press, I received from Dr. Trimen a list of 

 the Ceylon Halophytes known to him, and in which I find Cymodocea serrulata (true) 

 and C. australis. And amongst the Hydro char idece, there are to be added at p. 663 

 of vol. v., Halophila Beccarii, Asch., and Thalassia, Hemprichii, Asch. 



1. C. ciliata, Ehrenb. ex Aschers. in Sitzb. Ges. Naturf. Fr. fieri. 

 (1867) 3 ; in Linnsea xxxv. 162 ; leaves 3-6 by ^- in. linear falcate, tip 

 rounded ciliate- serrulate. Boiss. FL Orient, v. 23 ; Benth. FL Austral, vii. 

 178; Aschers. in Sitzb. Bot. Ver. Brandb. (1882) 28. Thalassia ciliata, 

 JS.on. Ann. Bot. ii. 97 ; Kunth Enum. iii. 120. Posidonia serrulata, Thw. 

 Enum. 333. Zostera ciliata, Forsk. FL ^gypt. Arab. 157. 



ANDAMAN ISLDS., Pram. CEYLON, Gardner, Harvey. DISTB. of the genus. 

 Stem or rhizome 3-12 in., woody, branched, covered with annular scars. Fl. and 

 frt. unknown. 



2. C- serrulata, Aschers. Sf Magn. in Sitzb. Ges. Naturf. Fr. Berl. 

 (1867) 3 ; leaves 4-6 by $- in. linear nearly straight, tip entire or denti- 

 culate. Posidonia serrulata, Spreng. Syst. i. 181. 



CETLON, Thwaites (C.P. 3056). DISTRIB. of the genus. 

 I have seen no Ceylon flowering or fruiting specimens. 



3. C. isoetifolia, Aschers. I. c. ; in Linnsea, I. c. 163 ; and in Nuov. 

 Giorn. Bot. ii. 182 ; stem short, leaves terete fleshy grooved tip 3-toothed. 

 Boiss. Fl. Orient, v. 22 ; Benth. FL Austral, vii. 178. C. sequorea, Kunth 

 Enum. iii. 118 (excl. Syn.) ; Thw. Enum. 333. 



SOUTH CARNATIC j at Tuticoreen, Wight. CEYLON, Harvey, Glenie. DISTRIB. 

 Indian Ocean. 



Leaves 3-5 by yV" TO m -> glaucous. Flowers in dichotomous cymes. 



4. C. australis* Trim. Cat. Ceylon PL 99; leaves 5-7 by - in., 

 linear nearly straight tip rounded or truncate and 3-toothed. Halodule 

 australis, Miq. Fl. Ind. Bat. iii. 227. Diplanthera tridentata, Steinh. in 

 Ann. Sc.Nat. Ser. ii.ix. 98. Zostera uninervis, Forsk. Fl. <3gypt. Arab. 

 cxx. and 157. 



