MR. G. BENTHAM ON AFRICAN ANONACE^E. 471 
The flowers being unknown, the position of this species in Popowia or Clathrospe) 
somewhat doubtful ; but the habit is entirely that of P. caffra. 
6. Oxymitra, Blurae ; 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 
Goniothalamus chiefly in the inner petals sessile not contracted into a claw, and from 
almost all the remaining Mitrephorew 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. Michella 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 8-winged, 
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 TJvaria or Unona\ but as he expressly says that the outer petals are spreading and 
the inner ones erect, it is very probably an Oxymitra; 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, ramulis gracilibus novellis pube densa ferruginea vestitis. 
Folia pleraque circiter 4 poll, longa, \\ poll, lata, supra lsevia, subtus penninervia. 
nervis arcuatis parallelis prominulis costaque ferrugineo-tomentosis, inter nervofl 
pube tenui conspersa. Pedicelli laterales, 1-li-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 2| poll, longa, 2-2^ lin. lata, supra 
glabrata ; interiora crassa, lata, vix \ poU. longa, circa genitalia arete conniventia. 
Torus convexus. Stamina numerosa, connectivo supra loculos incrassato. Gynaecn 
carpella numerosa, villosa, uniovulata, funiculo brevi ; styli lineari-clavati glabn. 
Pructus 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 
Carpel 
Fig. 9. Carpel, vertical section. Fig. 10. Carpel, transverse section. Fig. 11. Ovule. 
2. O. gracilipes, sp. n. ; glaberrima, foliis eUipticis obtuse acuminatis nitidulis, pedi- 
cellis solitariis gracilibus, petalis exterioribus ovato-lanceolatis acutiusculis paten- 
tibus.-Eolia pleraque 3 poll, longa, 1\ poll, lata, pallide virentia, tenuiter venosa, 
petiolo 2-lineari. Pedieelli ultrapollicares, glaberrimi. Sepala brevia, lata, recurva. 
Petala exteriora in specimine suppetente semipollicaria, sed forte nondum perfecte 
evoluta, interiora dimidio minora, supra genitalia arete conniventia. Torus leviter 
VOL. XXIII. 
