ON SOUTHrAliOlEICAN APOOYNACHJ:. 101 



20. Thyrsanihus pubescenSj nob. ; Forsteroma pubescens, A. DC. /. c. p. 436 ; Miill. I. c. i). 104. In 

 Brasilia: v. s. in herb, meo, Ceara (Gardner 1761). 



Its branches are oppositely yamose, studded with small white verrucous lenticels, sub- 

 pubescent, the axils being 1-2 in. apart ; leaves obovate, subacute or obtuse at the base, 

 rounded or emarginate at the mucronulate apex, flaccidly chartaceous, green above, 

 subpubescent, with yellowish slender midrib and oblique nerves, with 2 collateral 

 fulvous glands among the hairs at the base of the midrib, pale beneath and covered with 

 fine short tomentum, especiaDy on the nerves and transverse veins, between which are 

 very numerous fascicles of short hairs, 3-4| in. long, l|-2^ in. broad, on pubescent 

 petioles 3-7 lines long; panicle terminal, spiciform, 4 in. long, covered with reddish 

 pubescence, alternately branched at intervals of 2-4 liues, with short branches, the lower 

 ones 1 in. long, diminishing upwards, each on a bare support, carrying an almost capi- 

 tate head of small dense flowers on bracteolated pedicels ^ line long ; sepals acute, f line 

 long ; corolla 2^ lines long ; the acute segments 1;^ line long, with dextrorse convolution ; 

 stamens glabrous, half-exserted ; anthers acuminate, furnished at the base with 2 parallel 

 prongs. 



21. Thyrsanthus affinis, nob. : Forsteronia affinis, Miill. I. c. p. 100, tab. 30. In prov. Alt. Ama- 

 zonas et confinibus : v. s. in herb meo Tarapota (Spruce 4493) . 



Spruce's plant agrees sufficiently with Miiller's drawing. The branchlets are slender, 

 subquadrangular at the summit, striolate, with small lenticels, the axUs |-1 in. apart ; 

 leaves oblong elliptic, subacute at the base, as in the drawing (not cordate as in the text), 

 with a short, abrupt, subacute acumen, very glabrous, rigidly membranaceous, darkish 

 green above, subopake, sulcate along the midrib and oblique slender nerves, with 

 2 whitish glands at the base of the midrib, pale ferruginous and opake beneath, with 

 prominulent red midrib and nerves, finely reticulated veins, 3^-4^ in. long, l|-2 in. 

 broad, on sulcate petioles 3-3^ lines long ; panicle terminal, 4 in, long, remotely and 

 very laxly branching from the base ; lower branches slender, 2 in. long, bare at the base 

 for half their length, again branched, branchlets 3^ lines long, bearing at their summits 

 few very small flowers on bracteolated pedicels 1 line long, all glabrous ; sepals ovate 

 acuminate, pruinose, J-| line long ; corolla pruinose, 1^ line long ; segments acute, twice 

 as long as the tube, woolly within, dextrorsely convolute ; anthers dorsally pilose, half- 

 exserted ; disk of 5 oblong lobes, as long as the 2 glabrous ovaries. 



22. Thyrsanthus placidus, nob. In Alta Amazonas : v. s. in herb. Mus. Brit. Tarapota (Spruce 4295) . 

 A species very near the preceding, differing in its pubescent leaves and spicate 



inflorescence; branches very slender, puberulous, with axils |-1 in. apart; leaves 

 elliptic, acute at the base, constricted at the summit into a short acumen, flaccid, green 

 and subglabrous above, with immersed slender nerves, with 2 small glands at the base of 

 the midrib, paler beneath, yellow, covered with short soft pubescence, especially on the 

 prominulent nerves, 3 in. long, If in. broad, on pubescent channelled petioles 2 Hues 

 long; panicle terminal, 3| in. long, thyrsoid, pubescent, on a short peduncle, with 

 branches i in. long, 2-4 lines apart, spreading, again divided, each bracteolated branch- 



