ON SOUTH-AMERICAN APOCYNACE. 145 
fulvo-tomentous above on the nerves and margins, of a different size, and on longer 
petioles; the pedicels are longer, as are also the sepals, and as long as the tube of the 
corolla; the calycine scales are bidentate: these are conditions sufficiently different 
from the typical specimen. 
A drawing of this plant, and an analysis of its flower, fruit, and seeds, are shown in 
Plate XX. B. 
3. PnzsTONIA LATIFOLIA, Benth. in Hook. Journ. Bot. iii. 250; A. DC. L c. p. 429; Deless. Icon. v. 22, 
tab. 51; Müll. Z. c. p. 167. In Guiana: v. s. in herb. meo et alior. Pirara (Schomb. 755). ` 
A climbing shrub, with branches 2 lines thick, covered with dense yellow woolly 
tomentum, the axils 6 in. apart, being traversed between the petioles by an arching rib, 
furnished with several small toothlike hairy stipules; leaves ovate, navicularly plicate, 
recurved, and subcordate at the base, roundish at the summit, with a short, abrupt, often 
recurved acumen, opake-green above, scabridulous, shortly and softly pubescent, hirsutu- 
lous on the yellow slender nerves, beneath covered with dense yellowish tomentum, the 
midrib, stoutish nerves, and transverse veins of a reddish hue, 31-5 in. long, 2-3 in. 
broad, on thick pubescent petioles 2-21 lines long. The peduncle of the tomentous 
corymb is stout, reflected, 1 in. long, issuing from one side of the node between the 
stipules upon the transverse ridge, and bearing a capitate head of many flowers, 13 in. 
in diameter; sometimes it happens that many of the flowers disappear, giving it the 
appearance of a few-flowered raceme; the thick pedicels are 1 line long, supported by 
tomentous acutely linear bracts 3 lines long; the sepals acutely oblong, are hairy on 
both sides, 5 lines long, 2 lines broad, each with an inner broad pluridentate seale; the 
tube of the corolla is cylindrical, stout, pilose, 7 lines long, with 5 semiexserted linear 
appendages; segments inequilateral, oblong, acute on one angle, 4 lines long, 23 lines 
broad, hairy outside; stamens inserted in the middle of the tube, with subcohering 
anthers shortly exserted at the apex; disk urceolate, its margin split into 5 short crenate 
lobes, somewhat longer than the ovary. 
3. PrestoNIA 1POMEIFOLIA, A. DC. l. c. p. 429. In Cayenne: non vidi. 
A species scarcely differing from the preceding; leaves ovate, rounded at the base, 
abruptly cuspidate, pilose above, hispidly rufo-tomentous beneath, with more patent 
nerves, 4—6 in. long, 2-3 in. broad, on petioles 2-3 lines long; inflorescence capitate, rufo- 
tomentous; sepals pilose on both sides, 5 lines long; tube of corolla 6 lines long; disk 
urceolate, twice as long às the ovary, with crenulate lobes. 
4. PnrsrONIA GLABRATA, H. B. K. iii. 222: Hemadictyon glabratum, A. DC. Prodr. vii. 427. Iu 
America centrali, ad Guayaquil (Bonpland) : v. s. in herb. Mus. Brit. Panama (Seemann 1062). 
The above specimen, referred by Seemann in his Botany of the Herald p. 168, to the 
Brazilian type P. tomentosa, R. Br., is certainly very different. He there — pendit 
overlooked the plant in his collection which is here described as P. Seemannt. P. glabrata 
is a climbing species, with pale brown glabrous branches, with axils about 5 in. apart ; 
leaves obovate-oblong, broader below the middle, narrower towards the base, which is 
U 
