ON SOUTH-AMERICAN APOCYNACEZ. 139 
acute, reticulated, 8 lines long, 44 lines broad ; tube of corolla constricted in the middle, 
cylindrical, 10 lines long; segments acutely and obliquely ovate, 4 lines long, 34 lines 
broad; stamens arising from a pilose ring at the constriction of the tube; anthers acute, 
shortly bilobed at the base, connivent in a cone; disk of 5 oblong fleshy lobes nearly the 
length of the 2 oblong ovaries; style slender, bearing a thick oblong clavuncle with a 
lacerated membrane at its base, terminated by 2 short obtuse stigmata; follicles, accord- 
ing to Müller, terete, 4 in. long, 3} lines thick; seeds oblong, truncated (not rostrate), 
2 lines long, 1 line broad, compressed, surmounted by a copious coma 18 lines long, and 
suspended by a rigid funicle 21 lines long. 
A drawing of the follicle and of its seed is shown in Plate XX. a. 
2. RHODOCALYX CRASSIFOLIUS, nob.: Amblyanthera crassifolia, Müll. l. c. p. 143: Echites crassifolia, 
Spruce MS. In Brasilia; Rio Negro: v. s. in hb. meo, prope San Carlos (Spruce 3136). 
This, certainly, is not an Amblyanthera. Apparently it is a dwarfish erect shrub, 
with a stem only a few inches high, seemingly springing from a tuberous root, as in the 
preceding species. This stem is divided at its summit into 2 or 3 suberect, stoutish, 
reddish, angularly. compressed, sparsely hirsutulous branches, 3-33 in. long, each 
terminated by only 2 opposite patent leaves, which are oblong, cordate, rounded at the 
summit, rigidly coriaceous, with subrevolute margins, glabrous, reddish green above, 
with immersed nerves, below opake, reddish ochreous, nerveless, with sparing dark dots, 
midrib prominent; on different branches they are respectively 24 and 3$ in. long, 14 and 
17 in. broad, on stout petioles 1 line long; peduncle terminal, 2 lines long, bearing about 
2 flowers on slender pedicels 8 lines long; sepals acute, 8 lines long, 2 lines broad, of a 
reddish colour, thickly membranaceous, sparsely pilose; tube of corolla fleshy, cylin- 
drical, constricted in the middle, sparsely pilose, 20 lines long; segments spathulate- 
oblong, oblique, dextrorsely convolute, 8 lines long, 4 lines broad; stamens inserted in 
the constriction of the tube; filaments pilose; disk 5-lobed, half as long as the 2 ovaries. 
A drawing and analysis of the flower of this species are given in Plate XX. a. 
3. Ruopocaryx LANUGINOSUS, nob.: Echites lanuginosa, Mart. et Gall. Bull. Acad. Brux. xi. 357; 
Walp. Rep. vi. 477. In Mexico: non vidi. 
A species with an erect, branching, tomentous stem; leaves roundish, entire, sub- 
cordate, pale green above, densely covered beneath with soft woolly tomentum, as in 
R. rotundifolius, less than 1 in. long, on very short petioles ; flowers solitary in the axils, 
on a short pedicel; tube of corolla 23 in. long. 
4. RuonocaLyx svavEOLENs, nob.: Echites (Macrosiphonia) suaveolens, Mart. et Gall. Bull. Acad. 
Brux. xi. 356; Walp. Rep. vi. 477. In Mexico: non vidi. 
This plant cannot belong to Macrosiphonia, on account of its habit, locality, and 
inflorescence. It is congeneric with the preceding, and accords well with Ehodocalyz. 
It has an erect, branching, pubesecent stem; the leaves are oblong, entire, with revolute 
margins, pubescent above, snowy tomentous beneath, 2 in. long, 5-6 lines po almost 
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