аа и 
muto. 
MB. SPRUCE ON FIVE NEW PLANTS FROM EASTERN PERU. 197 
plexicaulis, dein trigonus, facie inferiore convexus. Spathe 4, secus 
spadicis stipitis apicem imbricate, ovate, concave; extima apice 
foliaceo bilobo; interiores sensim minores, acute; intima obtusata. 
Flores odorati. Spadices subcylindrici, obtusi, superne paullo tenui- 
ores, 3-4 uncias longi; floriferi 13 lineas, fructiferi 18 lineas crassi ; 
stipite tereti /-unciali. Disci 20, floriferi 34 lineas, fructiferi 6 lineas 
lati, 1} lineam crassi. Semina vix 3 lin. longa. 
This remarkable plant resembles the Cyclanthi and bifid-leaved 
Carludovice in habit, but differs from both in the laciniw of the 
fronds having a single strong costa (whence they should perhaps 
be considered conjugate pinnz), and in being destitute of plice. 
It is nearly allied to Cyclanthus, but differs essentially in the peri- 
gonium consisting of distinct disks (and not of a continuous spiral) 
embracing the spadix, and in the ovules being naked from their 
first appearance (long before the opening of the flowers), and 
springing on longish funiculi from the very walls of the disk, 
while in Cyclanthus they are at first contained in small pluri- 
ovulate ovaries, sessile on the walls of the disk in two rows, and 
finally become confluent. There would seem to be also a dif- 
ference in the seeds; but though there is a species of Cyclanthus 
in the forests of Tarapoto, I have seen only its young flowers, and 
Kunth describes the seeds incompletely. The seeds of Discanthus 
are remarkably 12-sulcate, and traversed from base to apex by a 
narrow rhaphe, which is not arilliform, as that of Cyclanthus is 
said to be. After fecundation, the stamens fall away, and the disks, 
increasing in thickness, become contiguous. Half-grown ovules 
had the micropyle still open, and the amniotic sac separable. 
Great numbers of acicular rhaphides exist in the cells of the 
funiculus, rhaphe, and testa; at first they are in bundles, but as 
the seed ripens they break up from each other. 
III. YANGUA TINCTORIA, a new genus of BIGNONIACEE, whose 
leaves are used for dyeing blue by the Peruvians of Maynas. 
YANGUA, gen. nov. N.O. Втахохтлсеж. Tribus TEcoME x. 
Char. Gen.—Calyz laxus obpyramidato-campanulatus, ore patulo, pro- 
funde 5-plicatus, fere ad medium usque in lobos 5 cuspidatos fissus. 
Corolla basi brevi-tubularis, dein campanulata compressa, antice pro- 
funde bisuleata, postice trigona; limbo sub-bilabiato, subsequaliter 
5-lobo. Stamina 4 didynama, cum rudimento quinti, in corollæ tubi 
apice inserta, corollá. dimidio breviora. Anthere biloculares, loculis 
divergentibus. Ovarium disco impositum, fusiforme, biloculare. Ovula 
00, secus septi angulos parietales inserta, subsessilia, globoso-oblonga, 
