FLORA NIGRITIANA. 361 
speculations of my own to all that has been said on the subject. 
I would merely observe that, from the various dissertations 
published, especially by Ad. de Jussieu, (Ann. Sc. Nat. Par. 
Ser. 3. v. 2. p. 22), Lindley, (Veg. Kingd. p. 728), and Hooker, 
(Bot. Mag. t. 387), it would appear that, notwithstanding the 
striking discrepancies of detail in the drawings of Beauvois, 
Jussieu, Lindley and Hooker, the N. Heudelotii and N. Vogelii 
are not really specifically distinct from the original N. imperialis, 
and that of all the different affinities suggested, no hypothesis is 
more plausible than that suggested by Planchon, and partly con- 
curred in by Lindley, that the place of Napoleona is near Barring- 
toniee, among anomalous Myrtacee. If the corona, or rings 
of filaments, called by some the intermediate and inner corollz, 
be regarded as sterile stamens, they will be found to be as analo- 
gous to the stamens of Myrtaceae in their insertion on the 
fleshy disk crowning the ovary as in their folded arrangement 
m the bud. In neither respect can they be compared with the 
Tings of filaments in Passiflore. 
Prae XLIX, L. Fig 1. flower, cut open; f: 2. upper and 
stigmatic portions of the style; f. 3. fruit; f. 4. the same, 
Vertical section; f. 5. transverse section of the same; f. 6. 
seed.— Fig. 1 and 2 magnified : the remainder natural size. 
The Asteranthos of Desfontaines, which A. de Jussieu has 
shown to be probably a native of Angola, does not appear to 
have been again found by any collector. 
LV. HowarLINEX. 
l. Blackwellia Africana, Hook. fil.; foliis ovato-oblongis bre- 
viter calloso-dentatis glabris coriaceis, racemis paniculatis, 
floribus secus ramos elongatos subsessilibus parvis pentandris, 
petalis calyce subduplo longioribus.—Sierra Leone, Don. 
licet inflorescentia pubescentes. Folia breviter petiolata, 
4-5 poll. longa, 2-24 poll. lata, obtuse acuminata, marginis 
dentibus glanduloso-callosis sepius distantibus et haud pro- 
fundis, basi obtusa, venis primariis validis subtus prominulis, 
