Jl'otala] LVII. T.YT1IRACE.E. 371 



1. ROTALA L. Mant. PI. ii. pp. 143, 175 (1771). Ammannia 

 Jientb. ct Hook. f. Gen. PI. i. p. 776 (partly). 



1. R. mexicana Cliam. & Scblecht. in Linnu'a, v. p. 5G7 (1830). 

 Subsp. Hierniana Koehne in Engl. Bot. Jahrb. i. p. 151 (1880). 

 a. verticillaris (L.), var. /S. Spruceana Hiern in Oliv. Fl. Troj). 



Afr. ii. p. 467. 



PuNGO Andongo. — On watery mud, among short herbage, in com- 

 pany with Utricidaria exiUs Oliv. ; about Lagua de Quibinda ; fl. and 

 fr. March 1857. No. 2337. 



Koehne of Berlin distinguishes the above from Rotala verticillata L. 

 by the insertion of the stamens being scarcely above the base of the 

 calyx instead of a little above the middle, and by the absence of petals. 

 Both species have a wide distribution over hot countries. 



2. R. myriophylloides \Yehv. ex Hiern in Oliv. Fl. Trop. Afr. 

 ii. p. 469 ; Koehne in Engl. Bot. Jahrb. i. p. 154 (1880). 



HuiLLA. — An aquatic herb, floating, apparently annual, gregarious ; 

 rhizome creeping, stoloniferous ; stems cylindrical, pseudo-articulate, 

 branched here and there, verticillately leafy at the nodes, interrupted 

 towards the apex with whorls of flowers after the fashion of Myrio- 

 phyllum verticillutum L. : joints longitudinally striate ; flowers herma- 

 phrodite, of a deep-rose colour, dimorphic, arranged in spikes which 

 rise above the water ; calyx campanulate, rosy, almost coralUne, 

 4-lobed ; lobes broadly ovate, rather acute ; cornua wanting or 

 represented by gland-like points ; petals 4, obovate or ovate-oblong, of 

 a deep-rose colour, longer than the calyx : stamens 4, all fertile, inserted 

 near or a little above the base of the calyx-tube, far exserted in the 

 short-styled flowers and included in the long-styled flowers ; style 

 filiform, straight, much shorter than the calyx in the short-styled 

 flowers and far exserted in the long-styled flowers : stigma capitate, 

 subtruncate : capsule rose-bloodred, ovoid or obovoid turgid, tipped by 

 the persistent style, many-seeded. Floating in or at the margins of 

 rivulets or rooting at the bottom of the shallower streams, always in 

 broad clumps, between Nene and Ohai, at an elevation of 5000 feet : 

 fl. and young fr. middle of May 1800. No. 2348. 



3. R. serpiculoides Welw. ex Hiern in Oliv. Fl. Trop. Afr. ii. 

 p. 469 ; Koehne in Engl. Bot. Jahrb. i. p. 158 (1880). 



HxJiT.rA.^ — An annual herb, scarcely a digit high ; stems erect, but 

 little branched : leaves linear : flowers reddish, sparingly supplied with 

 petals. Abundant and gregarious, in moist sandy wooded jilaces, in 

 company with species of Utriruhina, near the Monino : at an elevation 

 of 5000 ft. ; fl. and fr. April 1860. No. 2355. An erect, branched, 

 annual herb, 1 to :'. in. high ; leaves linear ; flowers axillary, reddish. 

 In the marshy pastures of the Monino : fr. beginning of April 1H60. 

 Coll. C.vim-. 582. 



4. R. decussata DC. Prodr. iii. p. 76(1828) ; Hiern in Oliv. Fl. 

 Trop. Afr. ii. p. 467, excl. syn. ; Koehne, I.e., p. 160. 



PuNGd Andonco. — In muddy-sandy places sometimes flooded, about 

 Lombe, but not abundant ; fl. and fr. March 1857. No. 2339. Plant 

 reddish when old, resembhng in habit Onlimnthis nunlnuis L. ; calyx 

 4-lobed, with linear cornua ; stamens 4 : capsule ;J-valved. widely 

 caespitose. In nearly dried up swamps near Quibinda, along the river 

 Cuije ; fl. and fi-. March 1857. No. 2340. Annual. In marshes near 



