OF THE THIRD TANGANYIKA EXPEDITION. 23 
COMPOSITA. 
Spilanthes Acmella, Linn. Lake TANGANYIKA.—Swampy ground near shore, 
Kibwesi, Dec. 21. No. 40. Flower white. 
Common in Tropics. 
УЕВВЕМАСЕ М. 
Lippia nodiflora, Rich. Lake TaNGANYIKA.—rowing in marsh and swamp, 
Sumbu, Oct. 19. No. 35. Flower pink. 
A common tropical plant. 
MONOCOTYLEDONS. 
NAIADACELE. 
Najas marina, Linn. LAKE TANGANYIKA.—Dredged in a few fathoms, Niamkolo 
Bay, Aug. 3. No. 17. A form verging towards var. muricata, A. Br. 
Var. muricata, A. Br. Lare Nyasa.—In about 4 feet of water at Kota 
Kota, June 20. No. 9. 
N. marina is a cosmopolitan species with numerous forms and varieties ; 
var. muricata is recorded from North Africa (Algiers, Egypt) and Albert 
Nyanza ; and outside Africa, from Sicily, Ceylon, and Australia. 
N. horrida, А. Br. VICTORIA Nyanza.—Shallow water in harbour, Bukoba, 
April 20. No. 50. 
Widely distributed in Tropical Africa ; recorded from Lake Tanganyika. 
РОТАМОСЕТОМАСЕ Ж. 
(Mr. Автнов BENNETT.) 
Potamogeton pectinatus, Linn. LAKE TANGANYIKA.— Water-weed taken by 
shore-wading, Mtondwe Bay, Aug. 10. No. 23 (flower). 
Cosmopolitan. 
P. Livingstonei Arth. Bennett. LAKE Nyasa.—In about 4 feet of water, 
Kambwe Lagoon, June 27. No. 12. 
Known only from Lake Nyasa. No fruit has yet been seen. 
P. Schweinfurthii, Arth. Bennett. LAKE Nyasa.—Water-weed growing in 
about 4 feet of water ; south-eastern arm, near anchorage and off Kota 
Kota, June. Nos. 2 & 8 (flower). LAKE Tanganyika.—Growing in 
shallow water, mouth of Malagarasi River, Jan. 16. No. 45 (flower and 
unripe fruit). УтстомАа NyANZA.—From shallow water in harbour, 
Bukoba, April 21. No. 56 (barren shoot). 
