ON SOUTH-AMERICAN APOCYNACEiE. 69 



SO named by Spruce. It has terete branches, with axils about 2 in. apart ; leaves elliptic, 

 subacute at both ends, chartaceous, margins revolute, opake green above, suloate along 

 the midrib, with more than 50 pairs of prominulent patent parallel nerves arcuately 

 conjoined within the margin, and fine intermediate reticulated veins, ferruginously 

 opake beneath, sulcate along the immersed nerves, 4-6 in. long, 1^2 in. broad, on 

 channelled petioles 4-5 lines long, deeply fossate at the base, with a hooded margin, 

 angular beneath, and conjoined across the nodes by a transverse ridge ; panicle terminal, 

 3 in. long, on a bare peduncle 9 lines long, with several short branches, each supporting 



3 flowers IJ in. long, on bracteolated pedicels 3 lines long ; sepals acute, 1 liue long, 

 each with numerous lanceolate minute inner scales ; tube of corolla narrower in the 

 throat, 8 Hnes long, gradually broader towards the base, 8 lines long, densely pilose for 

 f its length from the mouth ; segments obtusely oblong, 4 lines long, simply sinistrorsely 

 twisted in an obtusely pyramidal form in aestivation; stamens included, inserted at the 

 foot of the pilose ring ; anthers acuminate, with 2 obtuse short basal prongs ; disk annular, 

 5-grooved, half the length of the 2 oblong ovaries ; rest as in the generic character. 



3. Rhigospira PAtTciroLiA, nob. : Tabemamontana paucifolia, Spruce; Miill. l. c. p. 87. In AmazonaS: 



V. s. in herb, meo Panure, Rio Uahupes (Spruce 2564). 



This much resembles the typical species in habit and inflorescence. Its rugous 

 branches are stout and fistulose ; its leaves, fuscous and of a reddish hue, are obovate, 

 subacute at the base, obtusely pointed at the apex, flaccidly chartaceous, with parallel 

 divergent nerves terminating in the sinuosities of the margin, ferruginously reddish and 

 opake beneath, with prominent fuscous midrib, nerves, and transverse very reticulate 

 veins, 3^6^ in. long, 3-4 in. broad, upon stoutish petioles 6-9 lines long, which are angu- 

 lar beneath, deeply fossate at the base, the hollow being margined by an elevated hooded 

 rim, and are connected across the node by a transverse ridge ; panicles terminal in the 

 younger branchlets, 2J in. long, on a bare peduncle 1^ in. long, with an almost capitate 

 head of several flowers, on close spreading branches bare at the base, each bearing 6 or 7 

 flowers on pedicels 1^ line long, supported by short acute bracteoles ; sepals ovate, 1 line 

 long, ciliolated on the margins, with several inner basal scales ; tube of corolla 3 lines 

 long ; the segments oblong, 6 lines long, erect, and simply contorted sinistrorsely in aesti- 

 vation ; stamens inserted above the base of the tube upon pilose lines ; disk cylindrical, 

 thickish, 5-grooved, hirsutulous, very little shorter than 2 free ovaries. 



4. Rhigospiea reticulata, nob. : Taberncemontana reticulata, A. DC. I. c. p. 366 ; Miill. I. c. p. 87, 



tab. 27. fig. 2. In Bahia (Blanchet 3336 ; Riedel 445) : non vidi. 



A species with stout, rigid, subcinereous branches, 4-angular at the apex, branchlets 

 glabrous ; leaves patent, obovate, subacute at the base, rounded or obtuse, and mucronu- 

 late at the summit, with conspicuous nerves and reticulated veins, 3-5^ in. long, 

 2-3f in. broad, on petioles 4|-6 lines long, broad and fossate at the base ; panicle 

 terminal, on a peduncle \^ in. long, verruculous, with several short subumbellate 

 branches 2|— 3f lines long, each bearing several close flowers f-1 in. long, on pedicels 



4 lines long; sepals obtuse, 1^ line long, ciliolated, with very numerous lanceolate 



