48 ON SOUTH-AMEEICAN APOCYNACE^. 



BONAFOUSIA. 

 This genus was established by Prof. De CandoUe in 1844, upon a single species ; but its 

 characters were insufficiently defined. Dr. MiiUer, in 1860, reduced it into a section of 

 Tabern(Bmontana, with a short character quite useless for the purpose of distinction. It 

 possesses, however, several peculiar features that wUl maintain the validity of the genus ; 

 one of these consists in the remarkable manner of aestivation 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 aestivation ; 

 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. 



BoNAFOUSiA, A. DC. : Tabernmmontana (in parte) auct. : Sepala 5, subparva, ovata, ssepe membranacea, 

 et ciliata, erecta, imbricata, ad basin intus squamulis singula singulis denticulatis munita. Corolla 

 hypocrateriformis ; tubus longiuscule cylindricus, superne pauUo ventricosus, fauce constrictus; 

 segmenta 5, elongata, tubo paullo breviora, parallele subarcuata, obtusa, rotatim explauata, in sesti- 

 vatione pro tertia parte erecta, nervo oblique ad marginem mucronatim excurrente, et bine 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; antherce oblongse, apice acuminata", basi biaristatiEj connectivi rigidi, in conum sub- 

 cohaerentes." Discus cylindricus, membranaeeus, 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 bine funiculo pulposp semi- 

 immersa. Csetera ut in Peschieram descripta. 



Frutices dcZ arbusculse America calidioris, ramosi; folia opposita, oblonga, glaberrima, petiolata ; 

 paniculse axillares, ramosee, paucifloree. 



1. BoNAFOusiA TJNDULATA, A. DC. Prodr. viii. 359 : Taberncemontana undulata, Vahl (non Mey. nee DC. 

 in p. 368), Eel. ii. 20, icon. tab. 6; Poir. Diet. vii. 529; Bentb. Journ. Bot. iii. 243; Miill. Fior. 

 Bras. fasc. xxvi. p. 70 (nomen), tab. 21 (flos et fructus). In Guiana et ins. Trinidad : v. s. in herb. 

 Mm. Brit. Guiana Brit. (Scbomb. 42, Anderson); Poiteau (infructu) Acarouari (Sagot 1309). 



A species well figured by Vahl. It is a tree 30^0 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, vnth a 

 slender nerve along the margins, which are crispately 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, 4^-6^ in. long, including the acumen (9 lines long), 1^2i in. 



