30 ON SOUTH-AMERICAN APOCYNACEA. 
long, 8 lines broad in the wider, 4 lines broad in the narrower direction, being somewhat 
compressed and 2-grooved; it is seated on the persistent calyx, and terminates in 2 
small rounded lobes; when ripe, it splits along the grooves, and through the dissepiment, 
into two follicle-like moieties, each again dehiscing along the median line of the much 
thinner dissepiment, where its margins are inflected within the cell, to form 2 linear 
placentee, to which the numerous seeds are attached by a linear ventral hilum; these 
placentee, 2 in each moiety, are 24 in. long, 1 line broad, submembranous, studded with 
the points of attachment of the seeds, which are linear, compressed, acute and setaceous at 
the base, 14 line long, 4 line broad, flat, red, covered with scabrid points, each supporting 
a reddish rigid hair of peculiar structure, the lower shorter hairs 3 line long, gradually 
longer upwards; the upper longer hairs are very numerous, 6 lines long, and extending © 
5 lines beyond the apex; the albumen is small, oblong in shape, enclosing an embryo 
with 2 oval fleshy cotyledons, with a small terete superior radicle + of their length. 
From the different habit of the two plants here described, we might infer that they 
are the types of two distinct new genera; but as they were found within the same region, 
and agree in their veinless opposite leaves seated below the level of the transverse line 
that crosses the nodes, and in their fistulose branches, I have ventured to regard them 
as two species of the same genus, one furnishing the elements of the floral structure, the ` 
other presenting the characters of the fruit and seeds; this, however, remains to be 
confirmed. 
A drawing of this species, with a carpological analysis, is given in Plate V. a. 
2. MawoTHRIX Noposa, nob.: volubilis, ramulis tenuiter virgatis, subangulatis, striolatis, fistulosis, — 
glabris; axillis remotis, transversim incrassatis et nodosis: foliis oppositis, infra nodos insertis, - 
ellipticis, imo obtuse acutis, apice in acumen cuspidatum attenuatis, integris, submembranaceis, 
supra viridibus, opacis, costa tenui nervisque tenuissimis immersis, venis nullis, subtus flavide 
pallidioribus, opacis, costa rubescente nervisque immersis, petiolum versus minute 2-glandulosis; 
petiolo tenui, recurvato, limbo Oplo breviore: racemo axillari; pedunculo subbrevi, crassiusculo ` 
crebre bracteolato, bracteolis imbricatis, ovatis, glabris, mox deciduis, paucifloro; pedicello tenui 
brevissimo; floris structura ut in char. gen. In Brasilia: v. v. et sicc. in hb. meo (n. 2044), in 
montibus Organensibus. 
The flexuose branchlets are 2 line thick, with axils 5 in. apart and 2 lines thick across 
the nodes: the leaves are 3-34 in. long, 14-14 in. broad, on recurving petioles 4-5 lines ` 
long: the pedicel is 1 line long; the calyx 2 lines long; the tube of the corolla is 53 lines 
long, its obtuse segments 34 lines long, 2 lines broad; the filaments are 1 line long; the | 
anthers 3 lines long, anteriorly fixed above the sinus of the basal lobes. 
A drawing of this species, giving the floral analysis, is seen in Plate V. 5. 
