ON SOUTH-AMERICAN APOCYNACEA. 97 
obtusely acuminated, coriaceous, with 7-10 pairs of arcuately conjoined nerves, with 
others shorter and intermediate, smooth above, 3-4 in. long, 13-2 in. broad, on petioles 
2-3 lines long; panicles terminal or axillary, 3-4 in. long, on an elongated angular 
tomentous peduncle, with many lateral branchlets bare at their base and bearing several 
small pubescent flowers in heads 43-6 lines in diameter, on short pedicels, with ovate 
bracts 13 line long; flowers 11-2 lines long. 
9. THYRSANTHUS GUYANENSIS, nob.: Forsteronia Guyanensis, Miill. Linn. xxx. 414. In Guiana Brit. 
(Schomb. 821-1466) : v. s. in herb. Mus. Brit. (Sagot 1067). 
A species differing from all the preceding in its slighter habit. It has slender branch- 
lets, verrucously lenticellate, with axils about 1 in. apart; leaves elliptic, acute at the 
-base, suddenly constricted at the summit into a shortish obtuse acumen, subcoriaceous, 
margins revolute, pale green above, with divaricate slender nerves, the midrib near the 
petiole charged with a yellow granular gland as in the typical species, pale reddish 
yellow beneath, opake, slender nerves prominulent, mostly with a pore in their axils as 
in T. Schomburgkii, 2-2] in. long, ¿-1 in. broad, on channelled petioles 14 line long; 
panicle pyramidal, 2 in. long, its branches on a quadrangular rachis bearing several (4-6) 
subumbellate, very small flowers, on pedicels 1 line long, all ferruginously puberulous ; 
sepals acute, with ciliate margins, 1 line long; corolla 2 lines long; tube 4 line long, 
puberulous; segments lanceolate, hirsutulous outside, with dextrorse szestivation, glabrous 
inside, with median nerve obsoletely puberulous. 
10. ThyrsANTHUS CORYMBOSUs, nob.: Forsteronia corymbosa, A. DC. (non Mey.) l c. p. 437: Griseb. 
Fl. Br. W. Ind. p. 412: Echites corymbosa, Jacq. Amer. p. 34, tab. 30; Sw. Obs. 105. In Antillis : 
v. s. in hb. Mus. Brit. Jamaica (Dr. Wright). 
A twining species, growing to the height of 20 feet; very lactescent, with divided 
glabrous branches, the axils being 1 in. apart; leaves elliptic, somewhat rounded and 
obsoletely cordate at the base, subacute at the summit, entire, glabrous, green above, 
with prominulent red, arching nerves, and transverse, much reticulated veins, with 2-3 
distant small glands at the base of the midrib, pallid beneath, 2-23 in. long, j-17 in. 
broad, on slender petioles 3-4 lines long; panicle terminal, divided into two principal 
branches 13 in. long, which are much divided into many approximated branchlets 9 lines 
long, each on a bare pedunculate support 24 lines long, and bearing above 8 crowded 
bracteolated divisions, forming a corymbulose head, each division again divided into 
about 7 pedicellated flowers; bracts linear-lanceolate, membranaceous, red, obsoletely 
pubescent, 13 line long; pedicels pubescent, 4 line long; sepals linear-acuminate, very 
membranaceous, red, pubescent at the base, obsoletely pilosulous outside above, 1 line 
long; corolla 1% line long; tube i line long; segments obtusely oblong, membrana- 
ceous, red, subreflexed, 12 line long, with dextrorse convolution; stamens inserted in a 
pilose ring within the tube, exserted; anthers scarcely cohering, connivent, with a 
broad membrane at the apex, and 2 parallel short obtuse lobes at the base; disk of 3 free 
oblong erect lobes, as long as the 2 ovaries, pubescent at the apex; 2 elongated obtusely 
terete follicles, horizontally divaricate, 8 in. long; seeds numerous, oblong, subseri- 
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