ON SOTJTH-AMEEICAN APOCYNACE^. 147 



7. Prestonia HiasuTAj Miill. I. c. p. 163, tab. 48. In. Brasilia, prov. San Paulo : non i 

 The branches are covered with reddish rigidly hirsute hairs glandular at their base ; 



leaves broadly ovate, rounded and slightly cordate at the base, acuminatcj chartaceous, 

 fuscous-green above, sparsely pilose, covered beneath with erect sericeous hairs, 3^-7 in. 

 long, 2-5 J in. broad, on petioles 3 lines long ; the axillary inflorescence hirsute, with 

 flowers congested into a head 2 J in. in diameter, on a peduncle 6 lines long ; pedicels 

 4 lines long ; sepals acutely oblong, puberulous, 8 J lines long ; coroUa 1 J in. long ; tube 

 with an annular ring and subexserted appendages in the mouth ; segments^ half the 

 length of the tube, obliquely oblong ; anthers biaristate at the base, acuminate, upon 

 short filaments ; disk urceolate, 5-grooved, with 5 short apical lobes ; ovary half the 

 length of the disk. 



8. Prestonia lutescens, Miill. I. c. p. 164. In Brasilia, prov. Minas Geraes (Claussen 1957) : non vidi. 

 A species with the tomentous covering and general appearance of P. tomentosa. Leaves 



oblong, or lanceolate-ovate, pilose above, covered beneath with a dense yellow tomentuni, 

 2|— 4 in. long, 1^-2 in. broad, on petioles 2-3 lines long ; peduncle 2^-7^ lines long ; 

 sepals 5f lines long, pilose ; corolla yellow, pilose, 1 in. long, its tube 6 lines long ; 

 anthers and appendages somewhat exserted; disk urceolate, 3 times as long as the 

 ovary, with 5 short terminal crenulate lobes ; ovary pilose at the apex. 



9. Prestonia Bahiensis, Miill. I. c. p. 164. In Brasilia, prov. Bahia (Blanchet 24 bis et 3776) : 



A species resembling the preceding. Its branches are covered with ferruginous or 

 yellow retrorse hairs ; leaves broadly elliptic, obtuse and subcordate at the base, shortly 

 acuminate or emarginate at the summit, above softly fulvo-hirsute, 2|— 4J in. long, 

 2-3 J in. broad, almost sessile; inflorescence axillary, with capitate flowers as in the 

 typical species ; disk urceolate, with 5 short crenulate lobes, as long as the ovary. 



10. Prestonia lanata, Miill. I. c. p. 164. In Brasilia, prov. Minas Geraes (St.-Hilaire) : non vidi. 



A species resembling P. tomentosa, but with larger, narrower leaves. Its branches are 

 covered with more patent yellowish tomentum; leaves oblong, or lanceolate-ovate, 

 narrowing towards the obtuse base, gradually acuminate to the apex, membranaceous, 

 fuscous above, covered with yeUow hairs, beneath densely woolly with whitish silky 

 tomentum ; inflorescence capitate, on a short peduncle, all densely fulvo-pilose ; sepals 

 elongated, acuminate ; tube of corolla densely sericeous ; appendages exserted ; disk 

 urceolate, 5-lobed, a little longer than the ovary. 



11. Prestonia Surinamensis, MiiU. in Linn. xxx. 433. In Surinam : non vidi. 



A species near P. ipommfolia, with softer tomentum. Branches covered with short 

 reddish hairs; leaves broadly ovate, narrower and obtuse at the base, with a short 

 acumen, membranaceous, fuscous above, sparsely pilose, villous on the immersed nerves, 

 ferruginous hirsute on the margins, beneath covered with short fulvous tomentum, 

 6-10 in. long, 3^-6^ in. broad, on petioles 5 lines long ; axillary inflorescence capitate, 



Tl2 



