94 ON SOTJTH-AMEEJCAN APOCTNAGE^. 



Thyrsanthus, Benth. (non Elliot nee Schrank) ; Thenardia, Benth. (non Kunth) ; Forsteronia, Meyer 

 (in parte), Miiller, Benth. & Hook. Sepala 5, paxvula, ovata, subacuta, intus squamulis 8-3 minimis 

 prsedita. Corolla parva ; tubm cylindricus j segmenta obloDga, subsequilateraj tube longiora, saepius 

 intus glabra, rare lanata aut villosa, pauUo dextrorsum convoluta, dein subrotata. Stamina 5, 

 tubo eorollse inclusa, aut apice semiexserta ; filamenta brevia ; anthera; lineari-oblongaB, acuminatae, 

 imo furcis 2 parallele elongatis armatse, in conum cobserentes. Discus e lobis 5 oblongis, ssepius 

 discretisj ovaria cingens ; ovaria 2 distincta, eo non rarius longiora ; stylus brevis, glaber ; clavuncula 

 cylindrice S-sulcata, imo membrana peltata indnsiata ; stigmata 2, parva, terminalia. Folliculi 2, 

 tenuiter teretes, horizontaliter divergentes, sulco ventrali dehiscentes, suturse marginibus in placen- 

 tam cyHndricam introflexse. Semina plurima, imbricatim suspensa, lineaii-oblonga, compressi&- 

 sima, lateribus membranaceis paullo incurvatis, Isevia et ecompsa, hilo centraJi signata; em^o 

 incognita. 



Frutices scandentes Americse meridionalis, seepius glabri ; foUa opposita, rarius ternatim verticillata, 

 oblonga, petiolata, ssepius glabra ; paniculse axillares aut terminates, laxe thyrsoidetB aut capitatte ; 

 flores num£rosi, parvuli, inconspicui. 



1. Thyrsanthtjs Schomburgkii, Benth. Hook. Journ. Bot. iii. 245; A. DC. /. c. p. 387 : Forsteronia 

 Schomburgkii, A. DC. I. c. p. 438 (excl. syn.) j Miill. Flor. Bras. I. c. p. 107 in nota. In Guiana 

 Brit. (Schomb. 37, 57, 556, 557) : v. s. in herb, meo ex loc. cit. (Schomb. 537). 



This typical species has scandent, rugous, verruculous branches 2 lines thick, with ' 

 patently divergent branchlets ; its opposite leaves have a reddish hue, are obtuse at the 

 base, vidth a narrow recurved acumen J in. long, quite glabrous, palish green above, 

 sulcate along the midrib, which has 2 very minute glands at its base, several oblique 

 subimmersed nerves, beneath rubescently ferruginous, opake, with prominulent nerves 

 and reticulated veins, 3-5 in. long, 1 J-l| in. broad, on slender channelled petioles 1 line 

 long; panicle terminal, 3 in. long, with opposite ramifications 6 lines long, 4-7 lines 

 apart, dichotomous, each ray bearing an almost capitate cluster of flowers; pedicel? 



1 line long, with 2 lanceolate bractlets at the base; sepals acute, J line long, with 



2 minute scales at the base of each within ; tube of coroUa | line long, glabrous, with a 

 narrow pilose ring above its base ; the 5 segments linear-oblong, 1 line long, glabrous 

 within, expanded, with dextrorse convolution; stamens inserted in the pilose ring, 

 almost wholly included in it; filaments short; anthers cohering together and to the 

 clavuncle, acute at their summit, 2 obtuse prongs at their base. 



2. Thyrsanthus laurifolius, nob. : Thenardia ? laurifolia, Benth. I. c. p. 246 : Forsteronia laurifoHa^ 

 A. DC. /. c. p. 438 ; Miill. /. c. p. 106. In Amazonas : v. s. in herb, meo Rio Negro ad Barcellos 

 (Schomb. 953), Rio Negro ad Barra (Spruce 999). 



A species very near the preceding, and by mistake referred to Thenardia. Its 

 branches are stout, rugous, griseous, glabrous, with divaricating branchlets striate and 

 lenticeUate,"with axils l-lj in. apart; leaves elliptic oblong, acute, and inequHateral 

 at the base, gradually acuminate, margins somewhat crenulate, chartaceous, very 

 glabrous, glaucous green above, with a slender midrib and subimmersed fine nerves, 

 furnished at the base of the midrib with 2-8 yellow granular glands, ferruginous, opake 

 beneath, with prominent midrib and nerves 4-4| in. long, IJ-lf in. broad, on sub- 

 reflexed petioles 3-5 Unes long; panicles opposite or terminal, on short peduncles 



