ON SOUTH-AMERICAN APOCYNACEX. 147 
` 7. PRESTONIA HIRSUTA, Müll. Z. c. p. 162, tab. 48. In Brasilia, prov. San Paulo: non vidi. 
The branches are covered with reddish rigidly hirsute hairs glandular at their base; 
leaves broadly ovate, rounded and slightly cordate at the base, acuminate, chartaceous, 
fuscous-green above, sparsely pilose, covered beneath with erect sericeous hairs, 31-7 in. 
long, 2-53 in. broad, on petioles 3 lines long; the axillary inflorescence hirsute, with 
flowers congested into a head 23 in. in diameter, on a peduncle 6 lines long; pedicels 
4 lines long; sepals acutely oblong, puberulous, 83 lines long; corolla 1} 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, Müll. J. c. p. 164. In Brasilia, prov. Minas Geraés (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 tomentum, 
23-4 in. long, 14-2 in. broad, on petioles 2-3 lines long; peduncle 24-74 lines long; 
sepals 5% 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. Prestonra Bamrensis, Müll. Z. c. p. 164. In Brasilia, prov. Bahia (Blanchet 24 bis et 3776): 
non vidi. 
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, 24-43 in. long, 
2-31 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. Presronta Lanata, Müll. 7. c. p. 164. In Brasilia, prov. Minas Geraés (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, 
fuseous above, covered with yellow 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. 
ll. Presronta SurIvamensis, Müll. in Linn. xxx. 433. In Surinam : zon vidi. 
A species near P. ipomeifolia, 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, 31-61 in. broad, on petioles 5 lines long; axillary inflorescence capitate, 
: v2 
