142 ON SOUTH-AMERICAN APOCYNACEZ. 
11. Ruopocaryx Tweepranus, 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 1835 by Tweedie; both evidently 
indicate that the stems are simple, probably not more than 8 to 12 in. high; the stem is 
slender, pale brown, fistulose, very glabrous, $ 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 14 in., the intermediate internode 2% in., the 
lower one only 3 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, 2-23 in. long, 1-1} in. 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 
braets 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; corolla 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 subcohering, 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. RuopocaLyx CUNEIFOLIUS, nob, : caulibus e basi binis, humilibus, striatis, pallidis, puberulis; foliis 
basalibus oppositis, acute ovatis, bracteiformibus, sequentibus gradatim majoribus, reliquis obovatis, 
infra medium cuneatim angustatis, apice rotundiusculis et subito mucroniformi-apiculatis, rigide 
chartaceis, utrinque sparsim subpuberulis, costa hirsutula, marginibus ciliatis, concoloribus, nervis 
immersis divergentibus et crebre parallelis, fere sessilibus: racemo terminali, pedunculo quam folium 
sesqui longiore ; floribus 4, alternatim oppositis ; pedicellis imo bracteolatis, calyce paullo longioribus, 
breviter puberulis; sepalis lineari-acuminatis, membranaceis, valde imbricatis, sparsim pilosulis, mar- 
gine ciliatis, intus squamula bidentata munitis ; corolla hypocrateriformi ; 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; antheris 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 tenui, imo 
breviter bifisso, cruribus cum ovariis articulatis; clavuncula crassa, 5-sulcata, imo peltato-mem- 
branacea; stigmatibus brevibus terminalibus. In Brasilia: v. s. in kerb. meo (n. 16894), Minas 
Geraës (Claussen). 
