MOUNT RORAIMA IN BRITISH GUIANA, 35 
anthers linear. Glands of the disk 4, in 2 opposite pairs, the larger pair partly enclosing 
the smaller pair. Ovary inferior, laterally compressed, 2-celled ; style included, filiform ; 
stigma of 2 short oblong lobes; placenta ascending from near the base of the septum, 
thin; ovules numerous, flat. 
On the Roraima Range at 3500 ft., MeConnell & Quelch, 714; Kaieteur Falls on the 
Potaro River, Jenman, 7462. 
This is one of the most remarkable plants in the collection; its alternate leaves and 
general habit give it the appearance of a Gesneraceous rather than of a Rubiaceous 
plant. The two large bracts enclosing the flowers and the bilobed corolla-lobes are 
very remarkable characteristics. It is very closely allied to Didymochlamys Whitei, 
Hook. f., from New Granada, the only other known species, but differs in its much smaller 
leaves and very much longer corolla-lobules. In D. Whitei the leaves are 13-232 in. 
long, 4-11 lin. broad, and taper at the apex into a long acuminate point, and the 
subquadrate lobules of the corolla are only about 3 a line long and the same in breadth. 
To the generic characters of Didymochlamys may be added the following description 
of the fruit, taken from a specimen of D. Whitei sent to Kew by Mr. R. B. White in 
1882 :— Fruit a laterally-compressed 2-celled capsule, dehiscing at the apex between the 
glands; placentas ascending from near the base of the septum, thin ; seeds numerous, 
minute, ovate, flattened, thinly covered with rather long hairs, with a dense tuft at the 
narrower (micropyle ?) end; testa rather coriaceous, moderately thin; albumen copious, 
oily ; embryo minute. 
The two smaller glands of the disk in the fruiting stage of D. Whitei are a little 
longer than the larger glands, they are tubular in the upper part and may assist in the 
dispersion of the seeds. 
TocoYENA NEGLECTA, N. E. Brown, sp. n. Folia breviter petiolata, lanceolata vel 
elliptico-lanceolata, acuta, basi cuneata, supra pubescentia, subtus tomentosa. 
Cymæ terminales, subsessiles, 9-20-floree. Calyx acute 5-dentatus, plus minusve 
tomentosus. Corolle tubus 3-31 poll. longus, extra tomentosus, intra glaber, 
fauce hirtus ; lobi oblique oblongo-lanceolati, subacuti, glabri, ciliati. 
Branches subterete or obscurely 4-angled, with a light brown bark, tomentose when 
young. Leaves opposite, 3-7 in. long, 17-3} in. broad, lanceolate, elliptic-lanceolate or 
slightly obovate, acute, cuneately tapering at the base into a petiole 14-3 lin. long, 
somewhat harshly pubescent above, densely tomentose beneath, with the hairs along the 
veins distinctly diverging on either side; primary veins 9-13 on each side of the midrib, 
and together with the retieulated veinlets impressed above, prominent beneath. Stipules 
about 2 lin.long, triangular, acute, at first tomentose, becoming glabrous with age. 
Cymes terminal, subsessile, about 9-20-flowered. Flowers sessile. Calyx more or less 
tomentose ; the tube 14-23 lin. long, oblong, slightly tapering downwards; the limb cup- 
shaped, with 5 deltoid acuminate teeth 2-2 lin. long. Corolla hypocrateriform, 5-lohed, 
white; the tube 3-34 in. long, about 1} lin. diam., slightly enlarged at the mouth, 
tomentose outside, glabrous within, except in the throat, which is densely hairy; the 
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