30 OST SOUTH-AMEEICAN APOCYNACIIS. 



long, 8 lines broad in the wider, 4 lines broad in tbe narrower direction, being somewhat 

 compressed and 2-grooTed; it is seated on the persistent calyx, and terminates in 2 

 smaU rounded lobes ; when ripe, it splits along the grooves, and through the dissepiment, 

 into two follicle-Uke 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 

 placentae, to which the numerous seeds are attached by a linear ventral hilum ; these 

 placentae, 2 in each moiety, are 2| 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, 1 J line long, ^ line broad, flat, red, covered with scabrid points, each supporting 

 a reddish rigid hair of peculiar structure, the lower shorter hairs ^ 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. 



3. Manothkix nodosa, nob. : volubilis, ramulis tenuiter virgatis, subangulatis, striolatis, fistulosis, 

 glabris ; axillis remotis, transversim incrassatis et nodosis : foliis oppositis, infra nodes insertis, 

 ellipticis, imo obtuse aciitis, apice in acumen cuspidatum attenuatis, integris, submembranaceis, 

 supra viridibus, opacis, costa tenui nervisque tenuissimis immersis, venis nullis, subtus flavlde 

 pallidioribus, opacis, costa rubescente nervisque immersis, petiolum versus minute 2-glandulosis ; 

 petiolo tenui, recurvato, limbo 9plo 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 sice, in hb. meo (n. 2044) , in 

 montibus Organensibus. 



The flexuose branchlets are | line thick, with axOs 5 in. apart and 2 lines thick across 

 the nodes : the leaves are 3-3 J in. long, I3-I5 in. broad, on recurving petioles 4-5 lines 

 long : the pedicel is 1 line long ; the calyx 2 Unes long ; the tube of the coroUa is 5^ lines 

 long, its obtuse segments 3^ 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. b. 



