ME. SPBUCE ON FIVE NEW PLANTS FEOM EASTERN PERU. 197 



plexicaulis, dein trigonus, facie inferiore convexus. SpathcB 4, secus 

 spadicis stipitis apicem imbricatae, ovatae, concavae; extima apice 

 foliaceo bilobo; interiores sensim minores, acutae; intima obtusata. 

 Flores odorati. Spadices subcylindrici, obtusi, superne paullo tenui- 

 ores, 3-4 uncias longi; floriferi 13 lineas, fructiferi 18 lineas crassi; 

 stipite tereti 7-unciali. Disci 20, floriferi 3^ lineas, fructiferi 6 lineas 

 lati, \\ lineam crassi. Semina vix | lin. longa. 



This remarkable plant resembles the CyclantM and bifid-leaved 

 CarludoviccB in habit, but differs from both in the laciniae of the 

 fronds having a single strong costa (whence they should perhaps 

 be considered conjugate pinnse), and in being destitute of plicae. 

 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 Cyclantlius 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. Tangua tinctoeia, a new genus of Bignoniace^, whose 

 leaves are used for dyeing Hue hy the Feru/cians of Maynas. 



Yangua, gen. nov. N. O. Bignoniaoejs. Tribus TECOME-ffi. 



Char. Gen. — Calyx 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 bisulcata, postice trigona; limbo sub-bilabiato, subaequaliter 

 5-lobo. Stamina 4 didynama, cum rudimento quinti, in corollae tubi 

 apice inserta, corolla dimidio breviora. Antherce biloculares, loculis 

 divergentibus. Ovarium disco impositum, fusiforme, biloculare. Ovula 

 00, secus septi angulos parietales inserta, subsessilia, globoso-oblonga. 



