Mr. J. Mien on the Affinities of the Icacinaceae. 225 



stigma becomes obsoletely lobed. It is the only species hitherto 

 described, for the Icacina dubia of M c Fadyen will be shown to 

 be the Mappia racemosa of Jacquin. Three other species will, 

 however, be added below. The generic character may be thus 

 given. 



Icacina, A. Juss. — Flores perfecti. Calyx breviter campanulatus, 

 5-dentatus, dentibus acutis, persistens. Petala 5, oblonga, intus 

 villosa, extus sericea, hypogyna, pestivatione valvata, sub an- 

 thesi patentia, imo adhesione filamentorum in tubum breve m 

 conniventia. Stamina 5, cum petalis inserta, iisdem alterna ; 

 filament a carnosula, imo dilatata, apice subulata, et breviter 

 induplicata ; anthera ovatse, introrsse, 2-lobae, 4-loculares, imo 

 ad medium bifida?, connectivo tenui adnata?, dorso in sinu 

 affixse, lobis singulatim 2-locellatis, demum septicidis et longi- 

 tudinaliter evolutim* dehiscentibus. Pollen acute 3-gonum. 

 Ovarium liberum, oblongum, sub-gibbum, villosum, disco 

 parvo suffultum, 1-loculare ; ovula 2 juxta apicem loculi sub- 

 collateraliter superposita, podospermio crassiusculo suspensa, 

 anatropa. Stylus elongatus, subulatus, sulcatus, incurvus. 

 Stigma obliquum, obsolete lobatum, lateraliter excavatum. 

 Drupa villosa, monopyrena, 1-locularis, monosperma ; castera 

 ignota. — Arbores in Africam tropicam vel in Insulas vicinas 

 crescentes ; folia alterna, ovata, integra, coriacea, petiolata, ex- 

 stipulata ; inflorescentia paniculata, terminalis ; nores parvuli, 

 cum pedicellis brevibus articulati, bracteolis minimis, caducis. 



1. Icacina Senegalensis, Ad. Juss. Mem. Soc. Hist. Nat. i. 173. 

 tab. 9; DC. Prodr. i. 534; Guill. Perr. Tent. Fl. Seneg. i. 

 105. Chrysobalanus luteus, Sab. Trans. Hort. Soc. iv. 453 ; 

 — foliis ovatis basi rotundatis a medio acuminatis et apice 

 obtusis, vel rotundatis et retusis, reticulatis, coriaceis, utrinque 

 glaberrimis, supra sub-lucidis, subtus ferrugineis, petiolo brevi 

 crassiusculo canaliculato : fioribus terminalibus, laxe panicu- 

 latis, pedicellisque articulatis rufescenti-villosis ; drupa flava. 

 — Senegambia; v. s. in herb. Hook. (Heudelot). 



The figure above quoted of Jussieu gives a very good repre- 



* I shall continue to use this term to prevent a repetition of the following 

 mode of dehiscence, which I find nowhere described, although it is of fre- 

 quent occurrence : it differs essentially from the longitudinal or valvate 

 opening of the ordinary simple cell, in the same manner that the septicidal 

 dehiscence of a capsular fruit does from its loculicidal mode of opening. 

 The structure of its 2 lobes and their manner of dehiscence may be further 

 defined — lobaj introflexione marginum contiguorum singulatim parallele et 

 perfccte 2-locellata;, marginibus istis primo solutis, valvulis tunc contrarie 

 evolutis; dein apparet ut si lobac amboe 1-loculatae fueriut, et per rimam 

 lpngitudinalem dehiscerint. 



Ann. % Mag. N. Hist. Ser. 2. Vol.'w. 15 



