ON SOUTH-AMERICAN APOCYNACEX. 153 
latter it appears also to differ in its submembranaceous, shorter, narrower, lanceolate 
leaves, acute at both ends, and by its shorter inflorescence. 
5. RHAPTOCARPUS APICULATUS, nob. : Echites coalita, Müll. in parte (non Vell. nec DC.),7. c. p. 155. In 
Brasilia, prov. Ceará : v. s. in herb. Mus. Brit. Crato (Gardner 1754). 
A species very distinct from Velloz's E. coalita, and from E. Vautherii, A. DC., which 
Moller mingled together: he quotes Gardner's number 1755 instead of 1754, the former 
being E. versicolor, Stadelm. It is a scandent plant, with pallid, rather slender, fistu- 
lous, glabrous, striolate, tortuous branches, with axils 6 in. apart; leaves ovate, 
rounded at both ends, but suddenly constricted at the apex into a short, acute, almost 
mucronate point, subcoriaceous, with entire revolute margins, subfuscous above, finely 
corrugulated, with immersed indistinct nerves, ferruginously opake below, glabrous, the 
nerves scarcely prominulent, 334 in. long, 14-1? in. broad, on rather slender chan- 
nelled petioles 5-6 lines long; raceme axillary, reflected, nearly 2 in. long, bearing from 
the base many approximate flowers, which are almost umbellately close towards the 
extremity ; the very slender pedicels are 4-5 lines long; calyx truncate and shortly 
cupular at the base, cleft into 5 sepals; sepals submembranaceous, linear-oblong, obtuse 
and recurved at the apex, 2 lines long; tube of corolla narrow, a little swollen near the 
base, 5 lines long, its segments 3 lines long; disk of 5 fleshy oblong lobes, nearly as 
long as the ovary; the capsule, in a very young half-matured state, is terete, flattened, 
bisulcate, 14 in. long, supported by the calyx. 
DIPLADENIA. 
A genus established in 1844 by Prof. A. De Candolle. It consists of several species, 
mostly low suffruticose plants, with simple erect stems, which are fistulous, and grow 
out of tuberiform roots; they have few, but large, handsome campanular flowers. I 
have separated from it many of the species, here described under Homaladenia and 
Micradenia, which differ in many essential characters, and which also possess a 2-lobed 
disk; but in Dipladenia these lobes are larger and broader, and the anthers are cordate 
at the base, not expanded into two long basal prongs. 
Besides the above exceptions, Carruthersia and Kopsia have a 2-lobed disk. 
l. DirLADENIA rLLUsTRIs, A. DC. Prod. viii. 483; Müll. (in parte) Flor, Bras. fasc. xxvi. p. 125 (excl. 
icon. in tab. 38): Echites illustris, Vell. Flor. Flum. p. 114, Icon. iii. tab. 49. In Brasilia, prov. 
São Paulo: v. s. in herb. meo Ità (Weir 118) ; in prov. São Paulo (Ackermann). 
Velloz found this fine species in the mountains bordering on the provinces of Rio de 
Janeiro and Süo Paulo. Velloz's figure well represents the plant. : The stem, rising out 
of a large gongyloid root, is 8 in. high, pubescent, 24 lines thick, simple, erect, fistulous, 
with glandless axils 14 in. apart, bearing 3 opposite pairs of leaves in the upper portion, 
which are slightly divergent, ovate-oblong, subcordate at the base, shortly and suddenly 
acuminate at the apex, submembranaceous, puberulous on both sides, more densely 
x 
