Mr. Bentham's Account of two new Genera allied to Olacineae. 677 



seo, abortu monospenno, rai'ius 2 — 3-spermo. Semen inversum, ssepius 

 placenta cum illo a basi concreta spurie erectuni, umbilico spurio lato 

 imo loculo affixum, nunc ab apice loculi lateraliter pendulum. Embryo 

 in axi albuminis copiosi carnosi, rectus, apici fructus proximus, nunc 

 brevissimus rarius diraidio albuminis longior, radicula apicem fructus 

 spectante brevissima, cotyledonibus semiteretibus, plumula inconspicua. 

 Arbores v. frutices erecti v. interdum scandentes, inermes v. I'amis axil- 

 laribus spinescentibus arniati, glabri v. parce pubescentes. Folia al- 

 terna simplicia, integerrima, exstipulata, eglandulosa. Flores herma- 

 phfoditi V. abortu polygami, nunc axillares distiche v. irregulariter race- 

 mosi, spicati v. cymosi, nunc terminales cymoso-paniculati, rarius soli- 

 tarii laterales v. axillares. Bracteue squamaeformes ssepius minutse, rarius 

 juniores imbricatae. Bracteolce parvse in cupulam connatse, v. nuUae. 



Tribe I. Olace^. 



Ovarium basi dissepimentis spuriis (rarius evanidis) 3- — 4-loculare, apice 1- 

 loculare, placenta centrali dissepimentis spuriis basi adhserente superne 

 libera. Ovula tot quot loculi spurii ex apice placentae pendula. Semen 

 spurie erectum. Inflorescentia axillaris, racemosa, racemis rarius ad 

 florem unicum reductis. 



1. Heisteria*. Calyx liber, fructifer maximus patens. Petala 5 libera v. 



basi connata. Stamina numero petalorum dupla, omnia fertilia, filamenta 

 libera, hypogyna v. basi petalis adnata. Flores parvi, glomerati. 



2. XiMENiAf. Calyx liber, fructifer immutatus. Petala 4 — 5, libera. Sta- 



mina numero petalorum dupla, omnia fertilia, libera, hypogyna. 



* I have examined a specimen in flower and fruit in Mr. Miers' herbarium, of a species scarcely, if 

 at all, distinct from H. parvifoUa, Sm., although a native of the Organ Mountains instead of Sierra 

 Leone. Of the other species I have seen only the specimens in the herbaria of Banks and Smith. 



t X. parviflora, Benth. (PI. Hartw. p. 7), and X. americana, from Timor specimens, from the Paris 

 herbarium ; .Ethiopian specimens, Kotschy (n. 452) ; and American ones, Cuming (n. 11 20), Gardner 

 (n. 938), Blanchet (n. 2787), and several others, all in flower only. I have not seen the fruit. In 

 describing the X. parviflora, 1 had overlooked the circumstance that the dissepiments of the ovary 

 did not reach the point where the ovules are inserted, a fact first pointed out to me by Decaisne in 

 the autumn of 1839. 



4 T 2 



