256 ON SOUTH-AMEEICAN APOCYNACE^. 



botli ends, tliinly chartaceous, intense green above, pallid green beneath. Scarcely pubes- 

 cent, 2-4;| in. long, l^lf in. broad, on petioles 2-4 lines long ; raceme lateral, longer 

 than the leaves, on a peduncle bare at the base, bearing above 5-8 approximate alternate 

 flowers, on pedicels 6-9 lines long, supported by bracteoles one fourth their length; 

 sepals acuminate-lanceolate, revolute and ciliate on the margins, 2^ lines long, with an 

 inner ovoid scale equally broad; corolla glabrous, its tube 7 lines long, sKghtly con- 

 stricted in the middle, its appendages semi-exserted ; segments 2J lines long, 1^ line 

 broad ; stamens inserted on a pilose ring in the middle of the tube ; anthers cohering, 

 somewhat exserted ; disk of 5 short lobes, longer than the fusiform ovaries. 



3. H^MADicTYON MARGINATUM, Benth. Hook. Journ. Bot. iii. p. 250 ; A. DC. I. c. p. 426. In Guiana 



Brit. Pirara (Sctomb. 713) : non vidi. 



A glabrous climbing plant, near S. venosum, with oblong leaves, acute at both ends, 

 coriaceous, smooth above, with recurved thictened margins, 2-3 in. long ; raceme longer 

 than the leaves, on a peduncle bare at its base, bearing above several flowers on pedicels 

 minutely bracteolate ; calyx and coroUa exactly as S. venosum. 



4. H^MADicTYON Cayennense, A. DC. I. c. p. 427. In Cayenne : non vidi. 



A climbing plant, with slender scabridulous branches ; leaves elliptic, obtuse at the 

 base, cuspidately acuminate, membranaceous, glabrous above, with distant nerves and 

 veins, subscabridulous beneath, 2-2^ in. long, IJ-l^ in- broad, on petioles 6 lines long ; 

 raceme elongated, glabrous, the bare portion of the peduncle as long as the leaves, bear- 

 ing above many flowers on twisted pedicels 6-7 lines long, minutely bracteolate ; sepals 

 lanceolate, acuminate, glabrous, 2 lines long, with an inner ovate denticulate scale ; 

 tube of corolla 6-7 lines long, glabrous, cylindrical, a little wider above, with a callous 

 ring in the mouth, and beneath it 5 linear included appendages ; segments oblong, 

 obtuse, crispate, shorter than the tube ; anthers a little exserted ; disk of 5 ovate obtuse 

 lobes, subconnate at their base. 



5. H^MADicTYON Gaudichaudii, A. DC. (non MiiU.) I. c. p. 426 : Echites suberosa, Veil. Fl. Mum. 



p. Ill, Icon. iii. tab. 34. In Brasilia: v. v. et sice, in herb, meo (no. 1585), circa Rio de Janeiro; 

 V. s. in herb. Mus. Brit. prov. Sao Paulo, Santo Amaro (Bowie & Cunningham). 



A climbing species, with slender terete flexuose branches marked by prominent 

 lenticels, with dilated axils 9 in. apart, marked by a transverse somewhat vaginant 

 ridge ; leaves oblong, narrowed bfelow the middle, roundish or subobtuse at the base, 

 shortly acuminate and callously mucronate at the summit, margins sinuously undulate, 

 chartaceous, very glabrous, bright green above, sulcate on the midrib, with about 7 

 pairs of fine divaricate nerves arcuately conjoined, pale yellowish beneath, opake, with 

 prominent midrib, nerves, and finely reticulated veins, 4-6J in. long, l3-2^ in. broad, on 

 slender channelled petioles 3-4 lines long ; raceme solitary and lateral at the nodes, 

 7 in. long, on a slender peduncle bare for half its length, bearing upwards 16-20 alter- 

 nate or geminate flowers, on slender patent pedicels 4-5 lines long, sujpported by minute 

 recurved bracteoles ; sepals acutely oblong, with parallel nerves, imbricate, with an 



