Rotala] LVII, LYTHRACEAE, 371 
1, ROTALA L, Mant. Pl. ii. pp. 143, 175 (1771). Ammannia 
Benth, & Hook. f. Gen. Pl. i. p. 776 (partly). 
1, R. mexicana Cham. & Schlecht, in Linnea, v. p. 567 (1830). 
Subsp. Hierniana Koehne in Engl, Bot. Jahrb. i. p. 151 (1880). 
R. verticillaris (L.), var. B. Spruceana Hiern in Oliv. Fl. Trop. 
Afr. ii, p. 467. 
Punco ANDONGO.—On watery mud, among short herbage, in com- 
pany with Utricularia exilis Oliv.; about Lagda 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 Welw. ex Hiern in Oliv. Fl. Trop. Afr. 
ii, p. 469; Koehne in Engl. Bot. Jahrb. i. p. 154 (1880). 
Hvitia.—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 verticillatum 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 coralline, 
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 Qhai, at an elevation of 5000 feet ; 
fl. and young fr. middle of May 1860. 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). 
Houitia.—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 places, in 
company with species of Utricularia, near the Monino ; at an elevation 
of 5000 ft. ; fl. and fr. April 1860. No. 2355. An erect, branched, 
annual herb, 1 to 3 in. high ; leaves linear; flowers axillary, reddish. 
In the marshy pastures of the Monino ; fr. beginning of April 1860. 
COLL. Carp. 582. 
4, R. decussata DC. Prodr. iii. p. 76 (1828) ; Hiern in Oliv. Fl. 
Trop. Afr. ii. p. 467, excl. syn.; Koehne, ic., p. 160. 
Pungo AnponGo.—In muddy-sandy places sometimes flooded, about 
Lombe, but not abundant; fl. and fr. March 1857. No. 2339. Plant 
reddish when old, resembling in habit Centunculus minimus L. ; calyx 
4-lobed, with linear cornua ; stamens 4; capsule 3-valved, widely 
cespitose. In nearly dried up swamps near Quibinda, along the river 
Cuije ; fl. and fr. March 1857. No. 2340. Annual. In marshes near 
