448 LVII. MELASTOMACEE (HOOKER). [ Dissotis. 
1. D. (Heterotis) segregata, Benth. in Fl. Nigr. 350, Erect or 
suberect, shrubby below, strigose with short appressed bristles. 
Branches obtusely 4-gonous, copiously strigillose, nodes with long 
bristles. Leaves 2-4 in. by 1-1} in., elliptic-ovate or ovate-lanceolate, 
acuminate, base acute or rounded, 3—5-nerved, rather copiously stri- 
gose on both surfaces; petiole }-} in. Flowers 2 in. diameter, purple, 
1-3 at the tips of the branches, shortly peduncled or subsessile, 
not in a head, each involucrate; outer bracts 2, narrow, small, foliace-- 
ous; inner 4, opposite, scarious, closely sheathing the calyx, obovate, 
truncate, glabrous, ciliate, smooth. Calyx ovoid, } in., bristly at the 
very base only; tube terete, smooth ; mouth contracted ; lobes half as 
long as the tube, lanceolate, ciliate, persistent. Petals broadly ob- 
ovate. Anthers of long stamens nearly } in. Capsule glabrous, bristly 
at the tip only, 5-valved throughout its length. 
Upper Guinea. Nun river, Vogel! Confluence of Niger, Ansell! Edges of 
swamps, Nupe, Barter! 
In one specimen I find 8 stamens, with the connectives of the anthers all shortly 
produced, showing a transition to Tristemma. 
2. D. (Heterotis) petiolata, Hok. f Branches rather stout, 
erect, smooth, or with a very few short raised points, obscurely 4- 
ronous; nodes with 2-8 appressed bristles or 0. Leaves 4—6 in. by 
2-24 in., elliptic, subacute at both ends, 5-nerved, green and sparsely 
subscabrid, strigillose on both surfaces, most so above, paler below, 
with less distinct bristles ; petiole $-14 in. Flowers solitary or 2-nate 
at the ends of the branches, sessile; outer bracts leafy, inner narrower, 
also green. Calyx-tube } in., quite smooth, glabrous, with a few 
bristles at the very base; lobes quarter the length of the tube, tri- 
angular-ovate, acuminate, obscurely ciliate, persistent. Anthers 0 
long stamens 4 in., incurved, connective as long as the cells, stout; 
anthers of short stamens as long, with a very shortly produced connec- 
tive. Capsule much shorter than the calyx-tube, 5-valved at the top 
with a minute apical ring of bristles—Zristemma sp., Thomson in ap- 
pendix to Speke, Nile Journ. 635. See 
Nile Land. Madi, Speke and Grant! FI. Dec. 
Very similar to D. capitata; but leaves long-petioled, not at all ovate, with longer 
hairs on both surfaces, and very short calyx-lobes. 
3. D. (Heterotis) cornifolia, Benth. in Fl. Nigr.351. Subglabrous- 
Branches rather slender, obtusely 4-gonous, with lone straight bristles at 
the joints and very few elsewhere. Leaves 3—4 in. by me in., ovate- 
lanceolate, acute or acuminate, base acute or rounded, rigidly coriace- 
ous, d-nerved, both surfaces sparsely covered with very closely ap- 
pressed bristles, those on the upper surface rough and partially im- 
mersed in the epidermis; petiole }-1in. Heads sessile, few-flowered ; 
outer bracts foliaceous, inner ? in., scarious, obovate, with a ciliate 
keel. Calyx-tube 4 in., with a broad belt of bristles round the middle, 
sometimes reduced to a few bristles; lobes ovate-lanceolate, nearly 4 
