MR. G, BENTHAM ON AFRICAN ANONACE^. 471 



The flowers being unknowTi, the position of this species in Topowia or Clathrospermum 

 is somewhat doubtful ; but the habit is entirely that of P. caffra. 



6. OxTMiTRA, Blume ; Benth. et Hook. f. Gen. PL 26. 

 An Asiatic genus of seven species, of which the characters had to be slightly enlarged 

 to comprehend the three or four African ones described below. It differs from 

 Ooniothalamus chiefly in the inner petals sessile not contracted into a claw, and from 

 almost all the remaining Mitrephorece either in the 1- or 2-ovulate carpels, or in the 

 outer open or spreading petals being much longer instead of shorter than the inner 

 connivent ones. Bicliella has, however, the flowers of some of the African Oxymitras ; 

 and we should have united it with that genus, but that the seeds are said to be 3-wiiiged, 

 a character otherwise unknown in Anonacese. Marenteria, Nor., from the incomplete 

 character given by Dupetit-Thouars, Nov. Gen. Madag. p. 18, ha^ been usually referred 

 to Tlvaria or TInona ; but as he expressly says that the outer petals are spreading and 

 the inner ones erect, it is very probably an Oxxjmitra ; and if this should prove correct, 

 Thouars's name should in strictness be preferred. 



1. O. HAMATA, sp. n. ; foliis oblongo-ellipticis acuminatis supra glabris subtus puberulis, 



costis petiolis ramulisque ferrugineo-tomentosis, pedicellis solitariis superne in- 

 crassatis, sepalis minimis, petalis exterioribus longe lineari-lanceolatis apice 

 recurvis. — Arbor parva, ramuHs gracilibus noveUis pube densa ferruginea vestitis. 

 Folia pleraque circiter 4 poll, longa, \\ poll, lata, supra Isevia, subtus penninervia, 

 nervis arcviatis parallelis prominulis costaque ferrugineo-tomentosis, inter nervos 

 pube tenui conspersa. Pedicelli laterales, l-l|-pollicares. Sepala vix linea longiora, 

 reflexa. Petala crassiuscula exteriora basi breviter concava, dein planiuscula, 

 primum breviter linearia apice valde revoluta, et utrinque tomentosa, demum fere 

 recta v. apice tantum recurva, usque ad 1\ poll, longa, 2-2^ lin. lata, supra 

 glabrata ; interiora crassa, lata, vix \ poll, longa, circa genitalia arete conniventia. 

 Torus convexus. Stamina numerosa, connectivo supra loculos incrassato. Gynsecii 

 carpella numerosa, villosa, uniovulata, funiculo brevi ; styli Hneari-clavati glabri. 

 Fructus ignotus. 



On the River Bagroo, West Africa (G. Mann). 



Plate L. Fig. 1. Flower with the outer petals cut short. Fig. 2. One of the inner petals. Fig. 3. 

 Flower with all the petals removed. Fig. 4. The same with the anthers removed. Fig. 5. Anther, 

 back view. Fig. 6. The same, inner view. Fig. 7- The same, side view. Fig. 8. Carpel and style. 

 Fig. 9. Carpel, vertical section. Fig. 10. Carpel, transverse section. Fig. 11. Ovule. 



2. O. GRACiLiPES, sp. n. ; glaberrima, foliis ellipticis obtuse acuminatis nitidulis, pedi- 



cellis solitariis gracilibus, petalis exterioribus ovato-lanceolatis acutiusculis paten- 

 tibus.— Folia pleraque 3 poll, longa, 1\ poll, lata, pallide virentia, tenuiter venosa, 

 petiolo 2-lineari. Pedicelli ultrapoUicares, glaberrimi. Sepala brevia, lata, recurva. 

 Petala exteriora in specimine suppetente semipoUicaria, sed forte nondum perfecte 

 evoluta, interiora dimidio minora, supra genitalia arete conniventia. Torus leviter 



VOL. XXIII. 3 s 



