Najadaceae 



von 



A. B. Rendle. 



(Gedruckt im October 1901.) 



(Najades Juss. Gen. (1789) 18 ex parte. — Najadeae Endl. Gen. (1837) 229 ex parte. — 



Najadaceae trib. Najadeae Benth. et Hook. f. Gen. III. (1883) 1018. — Najadaeeae 



Magnus in Engl. u. Prantl, Pflzfam. II. 1. (1889) 214.) 



Wichtigste Litteratur. R. Brown, Prodr. (1810) 345. — Endlicher, Gen. 

 (1837) 230. — Kunth, Enum. pl. III. (1841) 111. — Aschersoh, Fl. Prov. Branden- 

 burg I. (1 864) 669. — A. Braun, Revision of the genus Najas, in Journ. of Bot. II. (1 864) 

 274; Über die von Charles Wright auf Kuba gesammelten Arten der Gattung Najas, in 

 Sitzber. Ges. naturf. Fr. Berlin 1868. 17. — Magnus, Najadacearum italic. eonspectus, 

 in Giorn. bot. ital. II. (1870) 186; Najadaceae, in Engl. u. Prantl, Pflzfam. II. 1. (1889) 

 214. — Bentham et Hooker f., Gen. III. (1883) 1018. — Morong, The Najadaceae 

 of North America, in Mem. Torrey Bot. Club III. 2. (1893) 57. — K. Schumann, in Fl. 

 brasil. III. 3. (1894) 717. — A. B. Rendle, A sjstematic Revision of the genus Najas, 

 in Trans. Linn. Soc. 2. Ser. V. (1899) 379 tt. 39 — 42; Supplementary notes, 1. c. (1900) 

 437; The British species of Najas, in Journ. of Bot. XXXVIII. (l 900) 105 t. 408. 



Morphologie und Entwicklungsgeschichte: Magnus, Beitr. zur Kenntn. d. 

 Gattung Najas, Berlin 1 870 ; Über die Gattung Najas, in Ber. deutsch, bot. Ges. XII. (1 894) 

 214. — Eichler, Blütendiagramme I. (1875) 80. — C. Bailey, On the structure of 

 N. graminea Del. var. Delilei Magn., in Journ. of Bot. XXII. (1 8 q 84) 305 tt. 249 — 2 52. — 

 B. Jönsson, Om befruktn. hos slägtet Najas, in Lunds Univ. Arsskr. XX. (1883 — 1884). 

 — K. Schumann, Morphol. Stud. (1892) 174. — Campbell, A morphological study of 

 Najas and Zannichellia, in Proc. Calif. Acad. Sc. ser. 3. Bot. I. no. 1. (1897). 



Character. Flores unisexuales, plantae monoecae rarius dioecae. Flos masculus 

 monander, ante anthesin saepissime subsessilis et in spatha inclusus, monochlamydeus ; 

 perianthium apice bilabiatum ad antheram arcte applicitum ; anthera terminalis saepissime 

 subsessilis, quadrilocularis rarius unilocularis. Flos femineus nudus rarius spatha in- 

 clusus, ovarium ovale uniloculare; Ovulum singulum basale erectum anatropum, integu- 

 mentis duobus; Stylus cylindricus, stigmatibus duobus vel tribus terminatus. Fructus in 

 folii vagina sub medium inclusus, cum pericarpio tenui semini adhaerente. Semen durum, 

 testa levis vel saepissime varie exsculpta; embryo rectus macropodus, valde evolutus, semini 

 conformis, endospermium nulluni. 



Herbae annuae, aqua dulci vel subsalina submersae, e nodis radicantes; caules tenues 

 elongati e folio paris inferiore ramosi, interdum, ut apparet, dichotome ramulosi, inermes 

 vel rarius aculeati. Folia per paria approximata, sessilia, e vagina subbrevi anguste linearia, 

 rarius latiora, sinuato-dentata vel serrulata, (dentes cum aculeo saepissime unicellulari 

 luteo-brunneo terminati, saepe ad aculeum e margine protrusum reducti), uninervia, rarius 

 in nervi dorso spinifera ; vagina truncata vel rotundata vel superne in auriculas producta, 

 margine plus minus spinifera; squamulae intravaginales binae minutae. Flores parvuli, 

 virides vel rubro-tincti , e basi ramulorum orti et in foliorum vaginis solitarii vel pauci 

 ■aggregati, nudi vel spatha circumdati. 



A. Engler, Das Pflanzenreich. IV. 12. 1 



