122 ON SOUTH-AMERICAN APOCYNACEX. 
in a shortish obtuse acumen; they have about 12 pairs of divergent nerves, are 3-33 in. 
long, 1-1} in. broad, on spreading slender petioles 3-4 lines long; the inflorescence con- 
sists of a single flower, solitary in each axil, on a slender erect pedunele 2 in. long, 
with a terminal pedicel 3 lines long, supported by a linear bracteole 23 lines long; 
sepals acute, 3 lines long; corolla of a purplish red colour, glabrous; tube 14 in. long, 
cylindrically narrowed at its base for 8 lines, funnel-shaped above, 7 lines broad in the 
mouth; segments obtusely dolabriform, 6 lines long and broad, dextrorsely convolute ; 
stamens included and inserted in the constriction of the tube; anthers cohering in a 
cone: the rest as in R. Pohlii. 
7. RHABDADENIA NERVOSA, nob.: Apocynum nervosum, Miller, Dict. (1768) n. 9: Echites (Laubertia) 
paludosa, Griseb. (non Vahl) in Flor. Brit. W. Ind. p. 415. In Antillis et America tropicali, sec. 
Griseb. in Cat. Pl. Cub. C. Wright, 33 (Wright 2954); in Revis. ejusd. Cat. 1885 (C. Wright 
2954) : v. s. in herb. Mus. Brit. Carthagena (specim. typ. ez herb. Miller). 
This is evidently the same species, with oval mucronulate leaves, described by Grise- 
bach as the “ Echites paludosa, Vahl," a blunder scarcely exceeded by any of the several 
errors of the former author in his enumeration of the apocyneous plants of the Antilles. 
It is difficult to understand how so glaring a mistake could have been made; for Vahl's 
excellent description and drawing are so precise, that no botanist ought to have erred on 
the subject. 
Apparently an erect shrub, with subscandent branches, the axils being 11-2 in. apart; 
the opposite leaves are ovate-oblong, obtuse (often oblique) at the base, broadly 
rounded at the summit, frequently emarginated, always suddenly mucronulate, thinly 
chartaceous, with scarcely revolute margins, very opake above, subferruginous, sulcated 
along the midrib, with very slender immersed nerves, opake and darkly ochraceous 
beneath, with blackish nerves scarcely prominulent, 12—31 in. long, 2-12 in. broad, on 
slender, straight, channelled petioles 4-9 lines long; raceme terminal, on a peduncle 
3-4 in. long, bearing about 5 alternate flowers on slender pedicels 4-6 lines long, each 
with a slender linear basal bracteole; sepals linear-oblong, with parallel nerves, 2-21 lines 
long, $ line broad; a handsome yellow corolla; tube 13 in. long, narrowed eylindri- 
cally at its base for 9 lines, funnel-shaped above; segments dolabriform, 9 lines long: 
the rest as in R. PoAlii. 
8. RHABDADENIA CORDATA, nob.: Apocynum cordatum, Miller, Dict. (1768) n. 10; Houston, Icon. n. 8, 
pl. 44. fig. 5, 10 et 11; A. DC. Z. c. p. 440: Periploca scandens, Miller, Dict. n. 10. Vera 
Cruz: v. $. in herb. Mus. Brit. (specim. in hort. Milleri cult. ex pl. ab Houstonio introducta) in 
fructu. 
The above specimen undoubtedly belongs to Rhabdadenia. The slender subscandent 
pale brown branch has its axils 23 in. apart; the leaves are oblong, roundish and obso- 
letely cordate at the base, rounded and mucronulate at the apex, entire, with sub- 
revolute margins, dark green above, with immersed nerves, yellowish opake beneath, 
with scarcely prominulent nerves, 23 in. long, 1 in. broad, on slender petioles 4 lines 
long; inflorescence axillary, with a terete peduncle half as long as the leaves, bearing 
