52 ON SOUTH-AMERICAN APOCYNACEZ. 
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 estivation, 
the tips descending into the mouth of the tube; disk tubular, membranaceous, adnate 
to one half of 2 acute ovaries. 
8. Bonarousta OLIVACEA, nob.: Tabernemontana olivacea, Müll. l c. p. 75. In Brasilia septentrionali : 
v. $. in herb. meo et Mus. Brit. San Carlos, Rio Negro (Spruce 3114, sub “ Peschiere sp.”). 
Ï do not perceive the resemblance of this species to the 7. heterophylla of Vahl, as 
stated by Müller, except that, like many other species, it has unequal leaves, which in 
shape and size are very different; the fuscous, dichotomous branchlets are slender, ` 
glabrous, with axils 1-1} 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, chartaceous, 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), 14-12 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, 14 line long, with several minute inner scales; the cylindrical tube of the corolla 
in bud is 74 lines long, somewhat inflated below the constricted mouth, and near the 
base, the basal fleshy portion of the segments, forming the knob in «estivation, 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. BONAFOUSIS RUPICOLA, nob. : Tabernemontana rupicola, Benth. in Hook. Journ. Bot. iii. 243; A. DC. 
l. c. p. 362; Müll. l. c. p. 74. In Amazonas: v. s. in herb. meo et alior. prope Rio Negro 
(Schomb. 898) ; Panuré, Rio Uahupes (Spruce 2559), Barra do Rio Negro (Spruce 1463). 
A species distinguished by its twice trichotomous branches ; leaves almost sessile, elliptic 
oblong, obtuse and inzequilateral 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 
yellowish opake, the nerves semi-immersed, 24-5 in. long, 1-13 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 lines long; segments oblique oblong, membranaceous, 9 lines 
long, 4 lines broad, in estivation sinistrorsely convoluted, suddenly inflected, the tips 
entering within the mouth of the tube; stamens seated a little above the middle of the 
