_Calyx_ quinquepartitus, inferus, persistens; segmentis ovatis, obtusis. _Corolla_ hypocrateriformis, magna, speciosa, alba. _Tubus_ spiraliter tortus, versis medium inflatus. _Limbus_ quinquepartitus, segmentis oblongo-lanceolatis, obtusissimis planis, oblique tortis: _ore_ nudo. _Stamina_ quinque, medio tubi inserta. _Filamenta_ lata, tubo adherentia, marginibus ciliatis. _Antheræ_ sagittatæ, flavæ, circa stigma conniventes. _Pistillum_ unicum, corollæ dimidio brevius. _Germen_ duplex. _Styli_ duo, filiformes, basi distincti, apice unito, paululum dilatati. _Stigma_ incrassatum, subcylindraceum, basi dilatatum, apice quinquelobum, lobis erectis. _Pericarpium_: Folliculi? vel potius baccæ duæ, ovato-rotundatæ, patentes, acuminatæ, basi calyce cinctæ, uniloculares, polyspermæ. _Semina_ plana, stricta, receptaculo centrali affixa. _Fig._ 1. Branch, _natural size_. _Fig._ 2. Lower part of the tube laid open to shew the stamens. _Fig._ 3. Pistil. _Fig._ 4. Stigma. _Fig._ 5. Section of the upper part of the Style. _Fig._ 6. Fruit (natural size). _Fig._ 7. Section of the same. _All but figures 1 and 7 more or less magnified_. This appears to be a very different species of _Tabernæmontana_, if indeed it really belongs to that genus, from any hitherto described. In the persistent calyx, this plant seems to depart from the character of _Tabernæmontana_, as it is defined by Jussieu; and also in the tube of the corolla, which is not inflated at the base, but near the middle, and is moreover singularly spirally twisted with deep furrows, if we may judge from the drawing. [Illustration: _G. Scharf Lithog:_ _Printed by C. Hullmandel._ _Tabernæmontana grandiflora._] TAB. C. STROPHANTHUS PENDULUS. CLASS AND ORDER—PENTANDRIA MONOGYNIA. _Natural Order—Apocyneæ._ GEN. CHAR. _Corolla_ infundibuliformis. _Faux_ coronata squamulis decem, indivisis. _Limbi laciniæ_ candatæ. _Stamina_ medio tubi inserta. _Antheræ_ sagittatæ, aristatæ vel mucronatæ. Ovaria duo. _Stylus_ unicus, filiformis, apice dilatato. _Stigma_ subcylindraceum. _Squamæ_ quinque, hypogynæ. Strophanthus _pendulus_; foliis oppositis ovato-oblongis acutis, floribus pendulis, antheris aristatis. HAB. Santo Fallo. _Caulis_ sarmentosus? cortice cinereo-fusca tectus. _Folia_ opposita, breviter petiolata, duas, tres uncias longa, unciam lata, oblongo-ovata, glabra, acuta, integerrima, juniora angustiora. _Flores_ in racemos parvos terminales, solitarii vel bini, penduli. _Pedunculus_ brevis, crassiusculus. _Calyx_ profunde quinquepartitus, laciniis ovato-lanceolatis, acutis, modice patentibus. _Corolla_ infundibuliformis, flava, limbo quinquepartito, laciniis longissimis, linearibus subundulatis; _fauce_ coronata squamis quinque bipartitis, purpureis: segmentis lanceolato-subulatis subundulatis.