Najas. 1 7 



longa, cum denticulis e basi lata spiniferis utrinque 10 — 22, laminae latitudinis dimidium 

 aequantibus ; vagina saepius breviter auriculata. Stylus brevis. Semen 1 mm longum, 

 areolis subquadratis in seriebus circa 20 (Fig. 4 V). 



Ost-Indien: Calcutta. — Hinter-Indien: Assam. 



25. N. tenuifolia R. Br. Prodr. (1810) 345; Rendle in Trans. Linn. Soc. 2. Sei*. V. 

 (1 899) 419 t. 42 figg. 158—162 et ib. (l 900) 443. — N. graminea var. tenuifolia A.Br. 

 in Journ. of Bot. II. (1 86 i) 278. — Caules erecti vel basi repentes, ramis saepe brevioribus 

 ascendentibus vel interdum elongatis et laxius foliatis; folia flexuosa, 2,5 — 3,5 cm longa, 

 in utroque margine cum denticulis vix prominulis 18 — 20. Semen oblongum vel ellipsoideo- 

 oblongum, 2,3 mm longum, regulariter areolatum, areolis quadratis minutis, in seriebus 

 circa 30 (Fig. $G—H). 



Australien: Nord- Australien , Queensland und New South Wales. — Neu-Cale- 

 donien. 



26. N. Browniana Rendle in Trans. Linn. Soc. 2. Ser. V. (1899) 420, t. 42 figg. 

 163 — 167. — Caules debiles, ramosissimi, 15 cm longi, folia filiformia cum spinulis in 

 utroque margine 10 — 15. Semen ellipsoideum , 1,5 mm longum, areolis quadratis in 

 seriebus circa 25 subirregulariter lineatum (Fig. 5/). 



Nord-Australien: Gavern-Insel, Carpentaria-Bucht (R. Brown). 



27. N". Leichhardtii Magnus, Beitr. (1870) 46, t. 8 figg. 1—8; Rendle in Trans. 

 Linn. Soc. 2. Ser. V. (1899) 420, t. 42 figg. 168 — 171. — Folia flexuosa, cum denticulis 

 in utroque margine 10 — 17 saepe laminae latitudinem aequantibus ; vagina valde auricu- 

 lata. Fructus ignotus. 



Australien (Leichhardt). 



28. N. australis Bory ex Chamisso in Linnaea IV. (1829) 501 ; Rendle in Trans. 

 Linn. Soc. 2. Ser. V. (1899) 421 t. 42 figg. 172 — 176. — N. minor var. indica A.Br. 

 in Journ. of Bot. II. (1 864) 278 pro parte. — Caulinia alternifolia Willd. ex Cham. 1. c. — 

 Laxissima, graminea, ramis elongatis ad 50 cm; folia sicca flexuosa, cum denticulis in 

 utroque margine 12 — 18, breviter triangulis; vagina superne late rotundata et denticulis 

 numerosis instructa. Semen anguste ellipsoideum, 2,7 mm longum, areolis quadratis minu- 

 tis in seriebus circa 25 regulariter lineatum (Fig. 5ÜT). 



Mauritius. — Bourbon. — Madagascar (Baron n. 2629 ; Humblot n. 351). 



29. N. setacea (A. Br.) Rendle in Trans. Linn. Soc. 2. Ser. V. (I 899) 422 t. 42 figg. 

 177 — 182, ib. (1900) 443. — N. minor var. setacea A.Br. in Journ. of Bot. II. (1864) 

 278. — Debilis caulibus filiformibus ; folia 1,4—1,7 cm longa, cum spinulis vix prominulis 

 in utroque margine 20 — 30; vagina late auriculata, auriculis paucidentatis. Semen ob- 

 longum 1,5 — 1,7 mm longum, areolis quadratis minutis, in seriebus circa 30, subdistincte 

 lineatum (Fig. 5 Jf). 



Mauritius (Mougeot; Neraud). 



30. N. horrida A. Br. ex Magnus, Beitr. (l 870) p. vn, 46, 47; Rendle in Trans. Linn. 

 Soc. 2. Ser. V. (1899) 422 t. 42 figg. 183—191, ib. (1900) 443. — N. peetinata Magnus 

 in Aschers, et Schweinf. Illustr. Fl. Egypte (1889) 145 et in Ber. deutsch, bot. Ges. XII. 

 (1894) 219. — Caulinia pectinata Pari. Fl. ital. III. (1858) 665. — Caules saepe robusti 

 elongati effusi, ramis dense fructicoso-ramulosis ; folia 0,8 — 2 cm longa, crassiuscula, saepe 

 rigida, cum dentibus validis 4 — 8 utrinque armata; vagina lata, truncate-rotundata. Semen 

 oblongo-ellipsoideum, 2 — 2,5 mm longum, areolis subquadratis in seriebus circa 20 distincte 

 lineatum (Figg. 2, et oN — P). 



Algerien: La Calle, Rivisteau au lac Houbera (Durieu). — Central-Afrika: 

 Gazelle-Fluss (Schweinfurth n. 1137 und 1228 z. T.); Fazogl (St. Ange). — Tro- 

 pisches Ost-Afrika: Tanganyika-See (Höre), Mozambique (Schlechter n. 11883). — 

 West-Afrika: Nupe (Barter n. 1065), Kamerun (Preuss n. 452, Staudt n. 488), 

 Senegal (Roger; Leprieur). 



31. N. interrupta K. Schum. in Engl. Pflanzenwelt Ost-Afr. C (1895) 94; Rendle in 

 Trans. Linn. Soc. 2. Ser. V. (1 899) 423. — Gaules graciles rigiduli; folia circa 1 cm longa, 

 irregulariter paucidentata (dentes utrinque 5 — 6); vagina saepius asymmetrica, latissime 



A. Engler, Das Pflanzenreich. IV. 12. 2 



