52 ON SOUTH-AMEEICAN APOCYNACE^. 



tube of corolla cylindrical, glabrous, 6 lines long, enlarged at the middle, where it is 

 staminigerous ; segments oblong, 8 lines long, inflected below the middle in aestivation, 

 the tips descending into the mouth of the tube ; disk tubular, membranaceous, adnate 

 to one half of 2 acute ovaries. 



8. BoNAFousiA OLIVACEA, nob. : Tahernamontana olivacea, Miill. /. c. p. 75. In Brasilia septentrionali : 

 V. s. in herb, meo et Mus. Brit. San Carlos, Eio Negro (Spruce 3114, sub " Peschierce sp."). 



I do not perceive the resemblance of this species to the T. heterophylla of Vahl, as 



stated by Miiller, except that, like many other species, it has unequal leaves, which in 



shape and size are very difPerent ; the fuscous, dichotomous branchlets are slender, 



glabrous, with axils 1-lj in. apart; the leaves are oval, or oblong ovate, patently 



opposite, suddenly acute at their base, hastily terminated by a long, narrow, recurved 



acumen 4-5 lines long, chartacepus, entire, with subrevolute margins, bright green 



above, opake, with immersed nerves, pale yellow beneath, opake, with reddish costa, and 



prominulent patent fine nerves, suddenly conjoined near the margin, 2|-3 in. long 



(including the acumen), ly- If in. broad, on petioles 5 lines long ; raceme in the dichotomy 



of the branchlets, very short and depauperated, on a peduncle 2 lines long, bearing 



above 3-4 caducous flowers, and 2 others above them, on bracteolated pedicels 5 lines 



long; sepals obtusely oblong, somewhat unequal, erect, imbricated, membranaceous, 



veined, 1^ line long, with several minute inner scales ; the cylindrical tube of the corolla 



in bud is 7^ lines long, somewhat inflated below the constricted mouth, and near the 



base, the basal fleshy portion of the segments, forming the knob in aestivation, is 2 lines 



long, the remaining introflected portion 5 lines long, descending into the tube ; stamens 



as in the preceding species ; disk cylindrical, submembranaceous, scarcely as long as the 



2 acutely oblong ovaries ; style, clavuncle, and stigmata as in the gen. char. ; follicles 



unknown. 



9. BoNAFousiA KUPicoLA, nob. : TaberruBmontana rupicola, Benth. in Hook. Joum. Bot. iii. 243 ; A. DC. 

 I. c. p. 362 ; Miill. I. c. p. 74. In Amazonas : v. s. in herb, meo et alior. props Rio Negro 

 (Schomb. 898) ; Panure, Rio Uabupes (Spruce 2559), Barra do Rio Negro (Spruce 1463). 

 A species distinguished by its twice trichotomous branches ; leaves almost sessile, eUiptic 

 oblong, obtuse and ingequilateral at the base, acuminated at the summit, submembrana- 

 ceous, entire, subfuscous above, sulcated upon the prominent midrib, many divergent 

 prominulent nerves, with others shorter and intermediate, reticulately veined, beneath 

 yeUowish opake, the nerves semi-immersed, 2^-5 in. long, 1-lf in. broad, on channelled 

 petioles 1 line long, very shortly fossated at the base; panicle lateral, 1-2 in. long, on 

 a peduncle 3 lines long, bibracteolated at the base, supporting 3-5 approximated alter- 

 nate flowers on pedicels 4-5 lines long, shortly bracteolated at the base; sepals ovate 

 obtuse, membranaceous, ciliated on the margin, imbricated, 1 line long, with a broad 

 many-laciniated scale; corolla cylindrical, tube much narrowed in the mouth, thence 

 gradually inflated below, 6 Hues long • segments oblique oblong, membranaceous^ 9 lines 

 long, 4 lines broad, in aestivation sinistrorsely convoluted, suddenly inflected, the tips 

 entering within the mouth of the tube ; stamens seated a little above the middle of the 



