Mr. J. Miers on the Affinities of the Icacinacese. 225 



stigma becomes obsoletely lobed. It is the only species hitherto 

 described, for the Icacina duhia of M^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. Petalao, oblonga, intus 

 villosa, extus sericea, hypogyna, aestivation e valvata, sub an- 

 thesi patentia, imo adhesione filamentorum in tubum brevem 

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

 filamenta carnosula, imo dilatata, apice subulata, et breviter 

 induplicata ; antherce ovatse, introrsse, 2-lob8e, 4-loculares, imo 

 ad medium bifidse, connectivo tenui adnatse, 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 suiFultum, 1-loculare ; ovula 2 juxta apicem loculi sub- 

 coUateraliter superposita, podospermio crassiusculo suspensa, 

 anatropa. Stylus elongatus, subulatus, sulcatus, incurvus. 

 Stigma obliquum, obsolete lobatum, lateraliter excavatum. 

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

 ignota. — Arbores in Africam tropicam vel in Insulas vicinas 

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

 stipulata ; inflorescentia paniculata, terminalis ; flores parvuli, 

 cum pedicellis brevibus articulatij 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 : floribus 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 introflexionc marginum contiguorum singulatim parallele et 

 perfecte 2-locellat8e, marginibus istis primo solutis, valvulis tunc contrarie 

 evolutis ; dein apparet ut si lobae amba) 1-loculatae fuerint, et per rimam 

 longitudinalem dehiscerint. 



Ann.^Mag.N.Hist. ^ei\2, Vol.ix. 15 



