138 AFRICAN POTAMOGETONS. 



P. DENSus L. *' Amerique bor." is an error. Schweinitz, when 

 he reported this for N. America, mistook Anaclutria for it. 



P. LUCENs L. I have seen specimens from Transvaal, Mada- 

 gascar, Abyssinia, Natal, Delagoa Bay, Suez, Central Africa [Schiir, 

 No. 1105), Senegal (var.), and Lake Nyassa. The Central African 

 specimens are mostly (or all ?) /'. Inngifolius Gay ! I have seen no 

 specimens of this from the Mauritius, and think what is so called is 

 a new form or subspecies of lucena .? My specimens are certainly 

 not crispus ; but they are not sufficient to describe, or describe 

 as new. 



P. NATANS L. [verus !). Abyssinia, sources of the Limpopo 

 [Nelson, 614), and Natal. 



I do not understand that Chamisso [Linnmt, ii. 1827) uses his 

 names in the sense adopted in the Conspectus; he uses them as 

 specific, not varietal for certain, using the letters merely as 

 headings to the various parts they come from. So that the 

 authority for P. canaricnsis, as used in the Consp)ectiis, is Kunth, 

 Emim. ii. 128, not Chamisso ; the same with capensis and mascar- 

 ensis. Boissier is quite correct in his citation " P. serotinus Schrad.," 

 only there should be added, " apud Koch, Syn. Ft. Germ, et Helv. 

 ed. 2 (1844)." " P. nutans var. capensis,'' Natal. 



P. FLuiTANS Eoth (auct.). It is not easy to give certain localities 

 for the above, but I believe the following may be regarded as 

 correct : — Tripoli, Madagascar, Transvaal, Marocco, Lagos, and 

 Egypt. 



P. jAVANicus Haskl. Lake Nyassa. 



P. PECTiNATUs L. The following are to be added : — Tripoli, 

 Cape of Good Hope, Bourbon, Angola, Lake Nyassa, Mozambique, 

 Natal, Griqualand, Transvaal, and Madagascar. 



P. FiLiFOKMis Nolte ! Egypt. 



P. PECTiNATC's L. To the distribution of this add Asia (nearly 

 all over!), America (both South, Mid, and North), and Australia. 



P. coLORATUS Hornem. This plant exemplifies how hard it is 

 to "kill" an error! I have repeatedly stated that the date 1823 

 on the cover of the fascicle of the Flora Danica containing this is 

 an error. It is a misprint for 1813, as can easily be seen by 

 turning over the plates, and finding 1818 coming after. Yet the 

 Conspectus uses plantaijincus Ducros (he wrote his name Du Croz), 

 1818. W. Indies is to be added to the distribution. 



P. poLYGONiFOLius Pour. Add Marocco, Madeira, Canaries, 

 Angola, and Madagascar. To the distribution add Asia (Siberia to 

 China, Tibet, India, and Japan) and Australia. 



The citation "Koen. & Sims, Ann. Bot." for ohlongns Viv. is a 

 curious one. P. ohlongns Viviani ! Anal. Bot. ii. 102 (1802) and 

 Fray. Fl. It. 1, t. 2 (1808) is the correct authority. 



P. pusiLLUs L. Add Libyan Desert, Transvaal, Natal, and 

 Canaries (not f. denticnlatus). The reference P. denticnlatus Link! 

 should go to P. trichoides, for Keichenbach was in error when he 

 stated it was not different from piisiltus ; he had seen no fruit. 

 Add N. America to the distribution. 



P. TEicHoiDEs Cham. I have specimens from "Teneriffe" 



