96 ON SOUTH-AMERICAN APOCYNACEX. 
5. THYRSANTHUS GARDNERI, A. DC. Z. c. p. 387: Forsteronia Gardneri, Müll. l. c. p. 100. In Brasilia» 
v. s. in herb. meo prov. Goyaz (Gardn. 3891). 
Apparently an erect shrub, having straight terete subpuberulous branches marked 
with small white lenticels, axils 14 in. apart; leaves spreading, oblong, rounded and 
subcordate at the base, gradually acute and often mucronulate at the apex, very flat, 
rigidly chartaceous, opake green above, with about 8 pairs of semi-immersed nerves, 
‘sulcate on the fine reticulated veins, with 2 small glands at the base of the midrib, 
glaucous pale beneath, opake, nerves yellow, prominulent, 3-4 in. long, 1-14 in. broad, 
on pubescent channelled petioles 1 line long; panicle terminal, laxis EE 34 in. 
long, rufously pubescent, branching from the base, branchlets 24 in. long, diminishing 
upwards, again branched, ultimate branchlets 4-6 lines pe bearing several closely 
approximated flowers on puberulous bracteolated pedicels 3 line long; sepals acute, 
puberulous, with membranaceous margins, 3 line long, with 3 minute inner basal 
scales; corolla reddish, glabrous outside; tube 3 line long; segments acute, densely 
lanate within, dextrorsely convolute; anthers subincluded, glabrous, smallish, with 
2 parallel obtuse basal prongs; disk of 5 ovate fleshy lobes, shorter than the 2 pilose 
ovaries. 
6. THYRSANTHUS ADENOBAsIS, nob.: Forsteronia adenobasis, Müll. Linn. xxx. p. 412. In Guiana: fi. 
Pomeroon (Rob. Sehomb. 707) : non vidi. 
A species near the preceding, with opposite, sometimes ternate leaves, oval or elliptic, 
slightly eordate at the base, submembranaceous, glabrous above, with 6-7 pairs of 
oblique nerves and reticulated veins, showing at the base of the midrib 2 large reddish 
granular glands, as in the typical species, densely and shortly tomentous beneath, 
4-4? in. long, 23-3 in. broad; panicle rigidly pyramidal, deep red, densely puberulous, 
oppositely branched and again divided, bearing numerous small flowers. 
7. THYRSANTHUS MACROPHYLLUS, nob.: Forsteronia macrophylla, Müll. Linn. xxx. 411: Tabernemontana 
macrophylla, Poir. Dict. Suppl. v. 276; A. DC. L c. p. 374. In Cayenne: non vidi. 
A species little known, which must not be confounded with the Tabernemontana 
macrophylla of Müll, described by me under Phrissocarpus rigidus. It has cinereo- 
pruinose branches; leaves broadly ovate, obtuse, with a short acute acumen, submem- 
branaceous, fuscous green above, glabrous, cinereo-fulvous and pruinose beneath, 
51-62 in. long, 33-4 in. broad, on petioles 1—1 line long; panicle terminal, pyramidally 
corymbiform, 4 in. long, yellowish puberulous, lower branches elongated, all again 
branched, and bearing several very small flowers on pedicels 14-2 lines long; calyx 
1 line long; corolla 24 lines long, like those in 7. populifolia and T. parviflora. 
8. THYRSANTHUS DIOSPYRIFOLIUS, nob.: Forsteronia diospyrifolia, Müll. Linn. xxx. 415. In Guiana Brit. 
(Rob. Schomburgk 834) : non vidi. 
A species near the first described, with glabrous branches thickened at the axils, 
verrucously lenticellate; leaves oblong-elliptic, subobtuse at the base, shortly and 
