212 CLii. ALiSMACE^ (wright). [Echitiodoriis. 



as long as the filaments. Ovary obliquely obovoid, compressed ; style 

 rostrate. Achenes many in a subglobose head, obliquely obovoid. 

 much compressed, 1 lin. long, lateral ridges inconspicuous: style 

 aristate. Seed with a thin, almost smooth testa.— Micheii in DO. 

 Monogr. Phan. iii. 55, 952 ; Durand & Schinz, Oonspect. Fl. Afr. v. 

 488. Alisma kumile, Kunth, Enum, iii. 154 ; Benth. in Hook. Niger 

 FL 528. 



TTpper Guinea. Senegal, PerroUef, 75 ! 811 ! Roger, 58 ! Senegambia : near 

 Richard Toll, Lelievre, Leprieur. 



Wile Xiand. White Nile ; on the banks of the river, near Gebel Nyemati, 

 Sckioeinfurth, 1032 ! Aba (Abbah) Island, ScMceinfurth, 991 ! 



5. RAUTAKENIA, Buchen. in Bull. Herb. Boiss. v. 854. 



Flowers unisexual. Sepals 3, persistent. Petals 3, marcescent. 

 Stamens hypogynous, 7, 8, or 9, sometimes more or less connate in 

 pairs. Oarpels 7-9, 1-ovuled. Achenes irregularly capitate. Seed 

 erect ; embryo horseshoe-shaped. — An erect, rush-like perennial. 

 Inflorescence paniculate ; flowers small, verticillate. 



Endemic, monotypic. 



1. Re Schinzii, Buchen. in BvM. Herb. Boiss. v. 855. Rhizome 

 thick; rootlets filiform, white. Leaves 1 ft. long, 2 lin. wide, linear or 

 linear-lanceolate, flat, S-nerved, acute. Scape about as long as the 

 leaves, erect, terete, striate when dry ; panicle with ternate branches ; 

 bracts subulate, the lowest 10 lin, long; flowers dioecious, odorous. 

 Sepals broadly ovate, obtuse, 2 lin. long ; margins white, membranous. 

 Petals half as long as the sepals, reniform -orbicular, marcescent, thin, 

 white. Stamens 7-9 ; filaments linear-subulate, white ; anthers yellow, 

 oblong, basifixed, dehiscing longitudinally. Oarpels obovoid, compressed. 

 Achenes semiorbicularj with three strong ridges running nearly round 

 each carpel ; style persistent, subapical, hooked. Seeds erect, much 

 compressed, smooth. — Echinodorus Schinzii, Buchen. in Bull. Herb. 

 Boiss. iv. 413, and App. iii. 10. 



Xiower G-ulnea. German South-west Africa ; Amboland ; Omulonga, Mau- 

 tanen, 53 , Ombalambuenge, Eautanen, 159 ! Olukonda, Hautanen, 222 ! 



6. BURNATIA, Micheii; Benth, et Hook. f. Gen. PI. iii. 1007. 



Flowers dioecious, small. Male flowers: Sepals 3, marcescent. 

 Petals 3, much smaller than the sepals. Stamens 9, inserted at the base 

 of the petals ; filaments subulate ; anthers iinear-oblong, as long as 

 the filaments, dorsifixed near the base. Rudimentary carpels about 12^ 

 hatchet-shaped. Female flowers : Perianth-segments 3, small, orbicular, 

 membranous, erect after flowering. Stamens 0, or 1-2 imperfect. 

 Carpels about 12, crowded on a small receptacle, obUquely semiorbicular ; 

 stigma ventral, sessile, papillose; ovule solitary, basal, anatropous» 

 Achenes 6-8, obovate-orbicular, compressed, doreally 3-ribbed ; stigma 



