14)2 ON SOUTH-AMEEIOAN APOCYNACEiE. 



11. Rhodocalyx Tweedianus, nob. In Brasilia austr. : v. s. in herb, meo, prov. Rio Grande ad fluv. 

 Jacuhy (Tweedie). 



Two specimens of this species were sent to me in 1836 "by Tweedie ; both evidently 

 indicate that the stems are simple, prohably not more than 8 to 12 in. high ; the stem is 

 slender, pale brown, flstulose, very glabrous, f line thick, the nodes scarcely dilated, 

 bearing 6 or 8 setiform stipules on each face ; in the specimen with a perfect flower 

 the terminal internode in its whole extent is 6 in. long ; in the younger specimen, with 

 the flower in bud, the terminal internode is 1^ in., the intermediate internode 2f in., the 

 lower one only | in. long ; the opposite leaves are oblong-ovate, obtuse or emarginately 

 cordate at the base, rounded and emarginate, or abruptly acuminate at the summit, 

 submembranaceous, opake green above, with immersed very fine divergent nerves, 

 yellowish opake beneath, the midrib, nerves, and fine transversely reticulated veins 

 reddish and little prominulent, 2-2|in. long, 1-1 fin. broad, on slender petioles 5-8 lines 

 long ; the terminal solitary flower, seated in the sinus of the ultimate leaves, has no 

 peduncle, the pedicel is 10 lines long, supported by 2 basal lanceolate membranaceous 

 bracts 3 lines long; sepals acutely lanceolate, submembranaceous, with undulate 

 margins, erect, pale reddish, 4 lines long (one a little broader), each with a lanceolate 

 ciliated inner basal scale ; coroUa apparently red, with a tube 10 lines long, narrowed at 

 its base for 2 lines, thence rather narrowly funnel-shaped above, with obovate inequi- 

 lateral rhomboid obtuse segments, finely reticulately nerved, 9 lines long, 4 lines broad ; 

 stamens seated on a dense pilose ring in the contraction of the tube ; filaments short, 

 retrorsely pilose ; anthers suboohering, linear, with a membranaceous apex, obtusely and 

 shortly bilobed at the base; disk of 5 free oblong lobes, shorter than the 2 acutely 

 oblong glabrous ovaries ; style reaching the anthers, with a thickened clavuncle mem- 

 branaceously peltate at the base, terminated by 2 short stigmata. 



These characters all correspond with Rhodocalyx, and in no way accord with Dipla- 

 denia. The shorter inferior internode in Tweedie's specimen indicates that the plant, as 

 in. the several preceding species, is very short in stature, and its stems simple. 



12. Rhodocalyx cuneifohtts, nob. : canlibns e basi binis, humilibus, striatis, pallidis, puberulis; foliis 

 basalibus oppositis, acute ovatis, bracteiformibus, sequentibus gradatim majoribus, rebquis obovatis, 

 infra medium cuneatim angustatis, apice rotundiusculis et subito mucroniformi-apiculatis, rigide 

 cbartaceis, utrinque sparsim subpuberulis, costa birsutula, marginibus cUiatis, concoloribus, nerris 

 immersis divergentibus et crebre paraUelis, fere sessilibus : racemo terminali, pedunculo quam folium 

 sesqui longiore ; floribus 4, alternatim oppositis ; pedicellis imo bracteolatis, calyce pauUo longioribus, 

 breviter puberuUs ; sepalis lineari-acuminatis, membranaceis, valde imbricatis, sparsim pilosulis, mar- 

 gine ciliatis, intus squamula bidentata munitis ; corolla bypocrateriformi ; tubo supra basin pro quarta 

 parte anguste cylindrico, superne ventricoso, quinqueplicato, fauce subconstricto, extus puberulo ; seg- 

 mentis late dolabriformibus, rotatis, tubo tertia parte brevioribus ; staminibus ad contractionem tubi 

 in annulo piloso insertis; filamentis antice affixis, gossypinis; antberis apice membranaceis, imo 

 aristis 2 obtusis parallelis quam filamenta paullo brevioribus munitis ; disco fere ad basin in lobos 5 car- 

 nosos apice emarginatos fisso ; ovariis 2 acuminatis discum paullo excedentibus ; stylo tenni, imo 

 breviter bifisso, cruribus cum ovariis articulatis; clavuncula crassa, S-sulcata, imo peltato-mem- 

 branacea; stigmatibus brevibus terminalibus. In Brasilia: v. s. in herb, meo (n. 16894), Minas 

 Geraes (Claussen). 



