Stemodiacra| LXXXIX. SCROPHULARIACE. 759 
1882). TZerebinthina sessiliflora O. Kuntze, Rev. Gen. Pl. ii. 
p. 468 (1891). 
Huiiita.—Habit of a Limnophila ; flowers purplish. In rivulets at 
the point of drying up and at their banks, from Lopollo to Catumba ; 
fl. and fr. Dec. 1859 and April 1860. The seeds are obtusely angular. 
No. 5777. Annual; habit of a Myrivphyllum; stems crowded, 
sparingly branched, cylindrical, obsoletely striate, spongy-lacunose, 
floating ; leaves 5- to 11-verticillate, the submerged ones capillary- 
multifid, the emerged ones unlobed, mostly deeply tridentate, rosulate, 
all more or less impressed-areolate on the surface ; calyx-teeth here 
and there unidentate at the tip; corolla violet-whitish, the tube with 
a yellowish tinge; the limb with 3 lower segments and 2 upper lobes ; 
stamens 4, didynamous, the anthers bilocular and cohering in pairs ; 
ovary 2-celled ; style rather short ; stigma bilamellate ; capsule bisulcate, 
bilocular, rather compressed. In streams from Lopollo to Nene and 
towards Ohai, plentiful, in company with Potamogeton javanicus Hassk. 
(Welwitsch No. 248) and species of Ottelia ; fl. and young fr. middle 
of May 1860. No. 5776. 
2. §. ceratophylloides Hiern, sp. n. 
A herb with the habit of a Ceratophyllum, submerged or at 
the time of flowering with the upper part of the stems emerged ; 
stems subcylindrical, glabrous, slender, about a foot long, branched, 
at length bare towards the base, leafy above ; leaves verticillate, 
capillary-multifid, # to 1 in. long, rather rigid in the living state ; 
flowers axillary, subsessile ; calyx membranous, shortly 5-cleft ; 
capsule (not quite ripe) ellipsoidal, sub-compressed, bisuleate, 
somewhat emarginate at the apex, 2-celled, 2-valved, about +} in. 
long, the valves septiferous along the middle; placentas adnate 
on both sides to the septum, fleshy, forming a central cylindrical 
column ; unripe seeds several, rather large, apparently horizontal, 
ellipsoidal-ovoid, smooth, with a protruding hyaline aril at the base. 
Huitis.—In the deeper muddy streams between Lopollo and 
Humpata ; also in streams and in the neighbouring limpid pools in 
Morro de Lopollo and on the Humpata plateau near Nene ; in young 
fr. April 1860. No. 5778. 
This is the Limnophila referred to by Welwitsch in Journ. Linn. 
Soc. v. p. 187 (1861). 
5. §. tenera Hiern, sp. n. 
A nearly glabrous, tender, erect herblet, 1 to 2 in. high, 
cespitose, apparently annual ; stems numerous ; branches spread- 
ing; leaves opposite, lanceolate or sublinear, scarcely acute or 
sub-apiculate at the apex, but little narrowed at the sessile clasp- 
ing base, entire, ;4, to } in. long, spreading ; flowers axillary and 
terminal or quasi-terminal, mostly alternate, solitary and spread- 
ing, about + in. long ; peduncles } to } in. long; bracts subulate 
zz to {5 in. long; calyx ;/, to } in. long, 5-partite, bibracteate at 
the base, the segments subulate, erect or at length reflected ; 
corolla bilabiate, from whitish to pale blue, slightly glandular- 
puberulous outside, somewhat pilosulous about the throat inside : 
stamens 4, didynamous ; anthers short, 2-celled ; capsule about 
