146 ON SOUTH-AMEEICAN APOCYNACE^. 



rounded and shortly cordate, the summit suddenly constricted into a short acute acumen, 

 margins suhrevolute, chartaceous, reddish green above, opake, sulcate on the midrib 

 and on 10 pairs of ascending nerves, and on the transversely reticulated veins, ferru- 

 ginously opake beneath, with prominent red midrib nerves and veins, scabridulous to 

 the touch, 3|-^| in. long, 1|-2| in. broad, on patent slender petioles 8-12 lines long ; 

 raceme solitary and lateral, as long as the leaves, on a peduncle bare at its base, bearing 

 above several flowers on slender hirteUous pedicels 3 lines long; sepals lanceolate, 

 acuminate, erect, very membranaceous, glabrous, hirteUous at the base, 4 lines long, 

 f line broad, each with a broad acute inner scale ; tube of corolla cylindrical, broadening 

 a little upwards, 8 lines long, with a crenate annular ring in the mouth, and below it 5 

 linear membranaceous appendages partly exserted ; stamens seated a little above the 

 middle of the tube on hirteUous filaments ; anthers acuminate, reaching the mouth, with 

 2 long slender divaricating prongs at their base ; disk 5-lobed, about as long as the ovary. 



5. Prestonia Seemanni, nob. : Presionia tomentosa, Seem, (non R. Br.) in Bot. Her. p. 168. Panama, 



in uliginosis : v. s. in herb. Mus. Brit, ex loc. citat. (Seemann) . 



A species distinct from P. tomentosa. Its leaves are oblong-ovate, rounded and sub- 

 cordate at the base, above the middle narrowing gradually and attenuated into a sharp 

 point, chartaceous, bright green above, pUose, with curving ascending prominulent 

 nerves, paler beneath, densely covered with yeUow tomentum, 5-3f in. long, 1|-2J in. 

 broad, on tomentous petioles 2 lines long; inflorescence lateral, covered with long 

 sericeous hairs, with many flowers congested into a globular head, upon a shortish 

 peduncle ; pedicels hairy, 4 Unes long ; sepals 6 lines long, lanceolate-ovate, covered on 

 both sides with long soft hairs, each with a long 3 -denticulate scale, pUose outside ; 

 tube of corolla cylindrical, membranaceous, with parallel nerves, pilose outside, 6 lines 

 long ; segments oblong, rigidly hirsute, especiaUy at the apex, with very long, yeUow, 

 rigid hairs ; stamens exserted beyond the linear appendages of the throat ; disk urceo- 

 late, submembranaceous, IJ line high, its short marginal lobes tridenticulate, twice 

 as long as the ovary. 



6. Prestonia caltcina, Miill. I. c. p. 162. In Brasilia, prov. Minas Geraes (St.-Hilaire) : non vidi. 



This handsome species must not be confounded with Scemadictyon calycirmm, Benth. 

 Its branches are densely clothed with rigid retrorse ferruginous hairs, the older ones sub- 

 glabrous ; leaves broadly ovate-eUiptic, rounded and pUcate at the base, shortly acumi- 

 nate, rigidly membranaceous, darkish brown above, sparsely puberulous, with viUous 

 margins, below rigidly tomentous, 4-4f in. long, 2J-3^ in. broad, on petioles 1^ line 

 long; axillary inflorescence capitate, on a peduncle 7 Unes long, and covered with 

 ferruginous hairs ; bracts acuminate, sparsely pilose, 9^10^ Unes long ; sepals acumi- 

 nate, pUose, as long as the bracts, each with an internal oblong 2-3-denticulate scale ; 

 coroUa 1-^ in. long ; tube a Uttle swollen at the base ; segments ovate, somewhat shorter 

 than the tube, the linear appendages in the throat bUobed and papUlous; stamens a 

 Uttle exserted ; disk urceolate, cleft halfway down into 5 entire lobes. 



A species said to be near Prestonia Surinamensis. 



