70 ON SOUTH-AMERICAN APOCYNACEX. 
2-serial basal scales; tube of corolla 6 lines long; segments inequilaterally oblong, sinis- 
trorsely convoluted; stamens included; disk cylindrical, crenulate on the margin, half 
as long as the 2 ovate, pilose ovaries. 
5. RHIGOSPIRA SPRUCEI, nob.: Tabernemontana Sprucei, Müll. /. c. p. 86, tab. 27. fig. 1. In Amazonas: 
v. s. in herb. meo Panuré, Rio Uahupes (Spruce 2594). 
A species well represented in the drawing cited. Its branches, somewhat slender and 
verruculose, have axils ¿-13 in. apart; its ovate, subflaccid leaves are 34-44 in. long, 
2-21 in. broad, on rather slender petioles 6-10 lines long, shortly and deeply fossate at the 
base, the hollow margined by a hooded edge, and connected across the node by a trans- 
verse ridge; panicle terminal, 4 in. long, on a bare peduncle 2 in. long, trichotomous at 
its apex, with branches bare for 1 in. and bearing few flowers at their summits, on pedi- 
cels 21 lines long, supported by bracteoles 1 line long; sepals ovate, obtuse, imbricate, _ 
subscabridulous, with several inner imbricated scales at the base; tube of corolla cylin- 
drical, 5 lines long, pilose in the mouth; segments oblong, subinequilateral, 5 lines long, 
21 lines broad, subscabridulous within, erect and simply contorted sinistrorsely in sesti- 
vation; stamens included, seated on a retrorsely pilose ring a little above the base of 
the tube; anthers coherent, acuminate, with 2 acute basal prongs; disk eylindrical, 
thickish, 5-sulcate, densely pilosulous, nearly concealing 2 free ovaries; style short, with 
an incrassated clavuncle. 
6. RuicosPIRA sINUOSA, nob.: Tabernemontana Sprucei (in parte), Müll. l. c. p. 86. In Amazonas: v. s. 
in herb. meo San Carlos, Rio Negro (Spruce 3693). 
A species differing from the preceding in its larger, more rigid leaves, with extremely 
sinuous margins, always very rounded at the apex, and a more copious inflorescence. 
The leaves are very acute at the base, sulcate along the midrib, the prominulent fine 
divergent nerves terminating in the hollow of each sinus, ferruginously and granularly 
opake beneath, with dark rubiginous prominulent nerves and immersed reticulated 
veins, 4-6 in. long, 24-3 in. broad, on stout channelled petioles 2-1 in. long, shortly and 
deeply fossate at the base, the fosset surrounded by an elevated hooded edge, partly 
amplexicaul and connected across the node by a transverse ridge; panicle terminal, 4 in. 
long, upon an angular fuscous peduncle, spotted with small yellow lenticels, bare at 
its base for 24 in., supporting several approximated, lenticellate, spreading branches 
bracteolated at the base, bare for 3-6 lines, and bearing several congested flowers - 
on pedicels 2-3 lines long, supported by oval bracteoles 1 line long; sepals obtusely 
ovate, 13 line long, fusco-pruinose, ciliated on the margins, furnished within at the base 
with subobsolete scales and ciliated hairs; tube of corolla cylindrical, a little swollen at 
the base, 3 lines long, with a pilose ring in the mouth; segments fleshy, oblong, sub- ` 
auricular at the base, erect, and simply convoluted sinistrorsely in æstivation, 5 lines _ 
long; stamens included, inserted above the base of the tube on 5 pilose lines ; anthers 
acuminate, with 2 slender aristiform basal prongs; disk cylindrical, thickish, -grooved — 
pilose round the margin, and concealing 2 free ovaries; style short, with an incrassated — 
clavuncle. 
