48 ON SOUTH-AMERICAN APOCYNACEX, 
BONAFOUSIA. 
This genus was established by Prof. De Candolle in 1844, upon a single species; but its 
characters were insufficiently defined. Dr. Miller, in 1860, reduced it into a section of 
Tabernemontana, with a short character quite useless for the purpose of distinction. It 
possesses, however, several peculiar features that will maintain the validity of the genus; 
one of these consists in the remarkable manner of «estivation of the linear-oblong 
segments of the corolla, where for two-thirds of their length they are suddenly bent 
inwards and downwards, so that their tips enter the mouth of the tube and embrace the 
summits of the stamens—a peculiarity manifested also in Anacampta and Anartia. 
Miiller has given, without any explanation, a drawing of the structure of the flower, 
where he repeats the mistake of De Candolle in assigning to it a dextrorse estivation ; 
but in the typical and all the other species, I have found, beyond doubt, that the 
convolution is sinistrorse. The disk is cylindrical, membranaceous, and adnate. All 
the species have slender ligneous branches. 
Bonarousta, A. DC.: Tabernemontana (in parte) auct.: Sepala 5, subparva, ovata, sepe membranacea; 
et ciliata, erecta, imbricata, ad basin intus squamulis singula singulis denticulatis munita. Corolla 
hypocrateriformis; tubus longiuscule cylindricus, superne paullo ventricosus, fauce constrictus; 
segmenta 5, elongata, tubo paullo breviora, parallele subarcuata, obtusa, rotatim explanata, in «esti- 
vatione pro tertia parte erecta, nervo oblique ad marginem mucronatim excurrente, et hinc pro 
reliqua parte subito inflexa, intra faucem descendentia, et stamina in parte involventia, cuncta 
sinistrorsum convoluta. Stamina 5, inclusa ; filamenta brevissima, in annulum pilosum supra medium 
tubi inserta; anthere oblonge, apice acuminate, basi biaristatee; connectivi rigidi, in conum sub- 
coherentes. Discus cylindricus, membranaceus, ovariis brevior, et his adnatus. Ovaria 2, oblonga, 
fere libera; stylus tenuis, apice incrassatus ; clavuncula crassa, conice oblonga, 5-sulcata et 5-glan- 
dulosa, imo membrana expansa suffulta; stigmata 2, parva, terminalia. Folliculi 2, globose oblongi, 
utrinque recurvati, faciebus versus angulum dorsalem oblique inclinatis, medio linea crescentiformi 
signati, ventre valde convexi, sutura intus utrinque inflexa et placentifera dehiscentes. Semina 
plurima, subovata, compressa, dorso pluricostata, ventre canaliculata et hine funiculo pulposo semi- 
immersa. Cetera ut in Peschieram descripta. 
Frutices vel arbuscule Americe calidioris, ramosi; folia opposita, oblonga, glaberrima, petiolata ; 
panicule azillares, ramose, pauciflore. 
1. Bonarousta uNDULATA, A. DC. Prodr. viii. 359: Tabernemontana undulata, Vahl (non Mey. nec DC. 
in p. 368), Ecl. ii. 20, icon. tab. 6; Poir. Dict. vii. 529; Benth. Journ. Bot. iii. 243; Müll. Flor. 
Bras. fasc. xxvi. p. 70 (nomen), tab. 21 (flos et fructus). In Guiana et ins. Trinidad : v. s. in herb. 
Mus. Brit. Guiana Brit. (Schomb. 42, Anderson); Poiteau (in fructu) Acarouari (Sagot 1309). 
A species well figured by Vahl. It isa tree 30—40 feet high, with terete branchlets 
subangular below the axils, which are 3—4 in. apart: the leaves are in equal opposite 
pairs, regular in form, lanceolate oblong, acute at the base, gradually or more suddenly 
narrowing at the apex into a long linear acumen; they are submembranaceous, with a 
slender nerve along the margins, which are erispately undulated, and thus somewhat 
rigid, bright green above, with many much divaricated fine nerves arcuately conjoined 
close to the margin, opake and of a more or less bright ochre colour beneath, with ` 
slender prominulent nerves, 44-64 in. long, including the acumen (9 lines long), 11-23 in. ; 
