160 ON SOUTH-AMERICAN APOCYNACEZ. 
mediate, ferruginously opake beneath, obsoletely puberulous, midrib and nerves promi- 
nulent, 21-3 in. long, 12-12 in. broad, on slender channelled petioles 4-5 lines long; 
raceme axillary, glabrous, on a peduncle 3 in. long, bearing many alternate flowers 2-3 
lines apart on spirally twisted pedicels 8 lines long; sepals acute, 2 lines long ; dark- 
red tube of corolla 12 lines long, narrowly cylindrical at the base for 4 lines, funnel-shaped 
above, yellowish in the throat ; segments rose-coloured, rhomboid, and broadly dolabriform, 
9 lines long and broad ; stamens seated on a pilose ring in the contraction of the tube, 
on short barbate filaments ; anthers acute, with 2 parallel, aristiform, basal prongs ; disk 
of two flat, rounded lobes + the length of the 2 subulate ovaries. No details are given 
by Lindley. \ 
4. M1CRADENIA RIEDELIHI, nob.: Dipladenia Riedelii, Müll. L. c. p. 131. In prov. Rio de Janeiro, Cabo 
Frio (Riedel): v. v. et sicc. in herb. meo (4021) prope Magé et Macahé ; v. s. in herb. Mus. Brit, 
Magé (Gardn. 537). 
The above plant, collected by me in 1836, corresponds with the description given 
by Müller of the Cape-Frio plant, from nearly the same locality. It is a rather low 
shrub, with glabrous, pallid, striate, often flexuous branches, with more or less approxi- 
mate axils 3-2 in. apart, much incrassate and charged with several acute warty glands 
between the petioles; leaves broadly ovate or oblong, subacute and plicate at the base, 
roundish and suddenly contracted at the summit into an acute acumen 2 lines long, 
chartaceous, with thin, subrevolute margins, fuscous green and very opake above, with 
. semi-immersed fine nerves, opake and reddish ferruginous beneath, the nerves being 
scarcely prominulent, 12—3 in. long, 1-1$ in. broad, on slender petioles 6-9 lines long; 
racemes 2, terminal, on bare peduncles 4-1 in. long, bearing upwards about 7 alternate 
flowers, on spirally twisted pedicels, 3 lines apart and 24-4 lines long, with a small, acute, 
deciduous bract; sepals acuminate, 2 lines long, with pellucid margins; tube of corolla 
14 in. long, narrowly contracted and scarlet at the base for a length of 5 lines, broadly 
funnel-shaped and paler above, with membranaceous segments, rhomboidally dolabriform, 
mucronate, 6-7 lines long, and of a rose colour; stamens inserted in the constriction 
of the tube; filaments niveo-tomentose; anthers cohering, of a reddish colour, with 2 
basal, obtuse, parallel prongs ; disk of 2 very short rounded lobes, one sixth the length of 
the 2 conical, oblong ovaries. 
5. MICRADENIA HIRSUTULA, nob. In Brasilia: v. s. in herb. meo (Claussen, sine loco). 
An erect species, apparently of low stature, the specimen being 8 in. high, the basal 
portion being divided into 2 branches, one of which is broken off ; it is clothed with 
whitish retrose or patent hairs; the upper axils 14 in. apart, with warty excrescences 4 
line long; the leaves are subovate, gradually rounded or subcordate at the base, roundish 
below the summit and constricted into a broadish acute point, rigidly chartaceous, sparsely 
and rigidly pilose above, with approximate, parallel, fine, immersed nerves, subferrugi- 
nously opake below, sparsely pubescent, hirsutulous on the prominent midrib, 12-14 in. 
long, 7-10 lines broad, on pubescent broad petioles 11-2 lines long ; the terminal raceme 
has a straight, stoutish, pubescent peduncle 24 in. long, bearing 3—4 distant, alternate 
flowers, on pilose pedicels 6 lines long, supported by an acute bract 2 lines long; sepals 
