ON SOUTH-AMERICAN APOCYNACEE, 119 
style shortly bifid at the base, very slender above; clavuncle oblong, cylindrical, incras- 
sated, 5-grooved and nectariferous, somewhat fimbriated at its apex, having at its base 
a broad umbraculiform appendage; stigma of 2 short oval lobes at the apex; 2 follicles, 
straight, terete, suberect or horizontally divaricate, dehiscing along each ventral suture, 
which is inwardly inflected along the margins, forming 2 linear coriaceous placente; 
seeds numerous, fusiformly linear, compressed, with a small central hilum upon one 
face, and having at the apex the long, peculiar, brush-shaped rostrum, as before 
described ; the embryo imbedded in waxy albumen, is teretely cylindrical, with 2 cotyle- 
dons many times shorter than the superior radicle, and nearly of the same thickness. 
The following appears to me a correct list of the genuine species, after the rejection of 
some others enumerated by authors. 
1. RuaspaprwNiA Ponui, Müll. Fl. Bras. t. c. p. 174, tab. 52. In Brasilia, prov. Rio de Janeiro: v. v. et 
sicc. in herb. meo (n. 3437 et 4024). Magé: v. s. in hb. Mus. Brit. Magé (Gardner 536). I have not 
seen its fruit, which is well depicted by Müller. 
A low shrub, with slender twining branches, with opposite, spreading, acutely 
lanceolate leaves, narrowly cordate at the base, 22 in. long, 7 lines broad, on a slender 
petiole 3 lines long; inflorescence lateral at each axil, on a very slender peduncle 
3 in. long, bearing 2 slender pedicels 3 lines long, 2-bracteolate at their base, each sup- 
porting a single purple flower; sepals acutely linear, 33 lines long, each with 3 acute 
distinct scales subconnate at the base (not deficient according to Müller); the con- 
tracted portion of the tube of the corolla is 5 lines long, 1 line broad, suddenly swelling 
into an almost cylindrical form, 14 in. long, 6 lines in diameter; segments dolabriform, 
9 lines long and broad, mucronate at the apex, simply convolute dextrorsely in sesti- 
vation; stamens inserted in the contracted portion of the tube; anthers broadly bifid 
and acute at the base; disk of 5 erect, free, obtuse, oblong lobes, somewhat shorter than 
the 2 free ovaries; style slender, expanded at the apex into a thick, 5-grooved, 5-glandular 
clavuncle, furnished at its base with a broad membranaceous umbraculiform appendage : 
the 2 terete divergent follicles, as figured by Müller, are 37 in. long, 2 lines thick; seeds 
9 lines long, with the addition of a brush-like rostrum of twice that length. 
2. RHABDADENIA PALUDOSA, nob.: Echites paludosa, Vahl (non H. B. K., nec Don, nec Griseb.), Eclog. 
ii. p. 19, Icon. tab. 5; A. DC. Z. c. p. 467. In Brasilia septentrionali (Van Rohr) : v. s. in herb. 
meo, et Mus. Brit. Maranhão (Gardner 6060). 
Van Rohr collected plants in all the provinces of Guiana, including that of Brazil; 
and Maranháo may be said to be within the same floral region. Gardner's specimen 
well aecords, in every respect, with the good description and drawing of Vahl, taken 
from Van Rohr's plant, and is unquestionably a Rhabdadenia. I have alluded to Grise- 
bach’s plant under the name of Echites paludosa Vahl, when describing Rhabdadenia 
nervosa, Miller wrongly refers Gardner’s plant to Rhabdadenia biflora, certainly a very 
different species. 
This is a small shrub, with erect, slender, virgate, striate branches, whose dilated 
axils are 11-2 in. apart; the opposite leaves are erect, lanceolate-oblong, acute at the 
