ON SOUTH-AMEEICAN APOCTNACB^, 99 



geminate, or axillary, 3 in. long, pubescent, bare at the base for f in., oppositely branched 

 at intervals of 9 lines, brancblets 9 lines long, again divided above tbe middle, bearing 

 above several lax flowers on bracteolated pedicels ^ line long ; sepals acute, pilose, 

 margins membranaceous, f line long ; corolla 1^ line long ; segments ovate, as long as 

 the tube, sublanate within, with dextrorse aestivation ; stamens subincluded. 



14. Thyksanthus gracilis, Benth. Hook. Journ. Bot. iii. p. 246 ; A. DC. I. c. p. 387. In Guiana Brit, 

 ad Curassawaka : v. s. in herb, meo (Schomburgk 608). 



A species near the preceding, with verrucously lenticeUate branches 2^ lines thick, 

 and very slender horizontal brancblets with axils 2-3 in. apart; leaves oblong-ovate, 

 rounded and subcordate at the base, suddenly narrowed towards the summit into a 

 narrow obtuse acumen, submembranaceous, glabrous, opake green above, sulcate along 

 the midrib and fine diverging nerves, reticulately veined, with 2 minute glands at the 

 base of the midrib, ferrugiaously opake beneath, with scarcely prominulent nerves, 

 3-3J in. long, If-lf in. broad, on slender spreading petioles 2 lines long ; panicle ter- 

 minal, 4-5^ in. long, subthyrsoid, very laxly and remotely branching from the base, 

 branches diverging, 2J in. long, diminishing upwards, very glabrous, again alternately 

 divided, the brancblets bearing many lax or subfasciculated flowers, on bracteolated 

 pedicels 1 line long ; flowers very small, like those of the preceding species. 



15. Thyesanthtts populifolius, nob. : Taberncemontana populifolia, Poir. Diet. Suppl. i. p. 276; A. DC. 

 I. c. p. 374. In Carolina et Georgia : v. s. in herb. Mus. Brit. Georgia (Marshal). 



A species with slender dichotomous branches. Its leaves are broadly ovate, subacute 

 at the base, shortly acuminate, subchartaeeous, almost glabrous above, pale and opake 

 beneath, shortly and rigidly pilose, 1| in. long, 1| in. broad, on petioles scarcely 1 line 

 long; panicles axillary, 2^ in. long, on a peduncle bare for IJ in., branching above, 

 branches 6-9 lines long, again shortly branched, and bearing numerous small flowers on 

 pedicels 2 lines long; sepals lanceolate, subrecurved, 1 liae long, with several very 

 minute inner scales ; corolla glabrous ; tube contracted in the middle, IJ line long; seg- 

 ments oblong ovate, Ij line long, with dextrorse convolution ; stamens almost wholly 

 included within the tube; anthers cuspidate, with 2 long acute basal prongs; style, 

 stigma, and disk as in the generic character. 



16. Thybsanthus DiFFORMis, nob. : Echites difformis,Walth..Fl. Carol.; Pursb, Fl. Un. St. i. 178 ; Ellis, 

 Sk. i. 312: Echites puberula, Mich. Fl. Bor. Amer. i. 120; Poir. Diet. Suppl. ii. 537 : Forsteronia 

 difformis A. DC. I. c. p. 437 : Secondatia difformis, Benth. & Hook. Gen. ii. 710. In Carolina et 

 Florida: v. s. in herb. Mus. Brit. Florida (Chapman). 



4. slender climbing species, with pubescent branches ; leaves lanceolate elliptic, acute 

 at the base; acuminate, membranaceous, pale green above, opake, obsoletely puberu- 

 lous with slender immersed pellucid nerves and reticulated veins, with a granular 

 yellow gland at the base of the midrib, very pellucid, opake beneath, puberulous on the 

 midrib and nerves, lJ-3 in. long, 6-12 lines broad, on channelled petioles 2 lines long ; 

 panicles axillary, glabrous, 2^ in. long; peduncle slender, bare at the base for 1 in., 

 ^ o2 



