656 CXXU. EUPHORBIACE& (HUICHINSON). | Martretia. 
deeply grooved on the upper side, wrinkled, otherwise glabrous ; stipules 
ovate-lanceolate, small, soon falling off. Male racemes axillary on the 
young shoots, solitary or subsolitary, about 2 in. long; axis slightly 
flexuous, sulcate, glabrous; bracts ovate, slightly keeled, ciliate ; pedicels 
about ? lin. long, glabrous. Sepals 4, oblanceolate, # lin. long, ciliate 
towards the apex, otherwise glabrous. Stamens 5-7; filaments 4 lin. 
long, glabrous ; anthers ellipsoid, nearly } lin. long, mucronate. Rudi- 
mentary ovary short, bifid, glabrous. Female racemes solitary or gemi- 
nate towards the base of the young shoots or on the two-year-old 
wood, 14-2 in. long; axis angular or deeply sulcate, glabrous; bracts 
ovate or ovate-triangular, about half the length of the pedicels, ciliate ; 
pedicels stout, angular, 1 lin. long, glabrous. Sepals 5 or 6, ovate- 
lanceolate or lanceolate, gradually acuminate, ? lin. long, ciliate. Ovary 
2-lobed (resembling 2 shoulders), each lobe very slightly bifid, glabrous; 
styles connate for about 4 lin. at the base, linear and undivided, glabrous, 
3 lin. long. Fruits not seen, 
North Central. Upper Ubangi region: valley of the Tomi River, between 
Fort Sibut and Fort Possel, Chevalier, 10577 ! 
25. PROTOMEGABARIA, Hutchinson in Hook. Ie. Pl. t. 2929. 
Flowers dicecious. Petalsabsent. Male flowers: Sepals 5, imbricate. 
Disk-glands 5, alternating with the filaments, large and fleshy, contiguous. 
Stamens 5, opposite the sepals; filaments free; anthers introrse, cells 
parallel, contiguous, dehiscing longitudinally. Rudimentary ovary 
columnar, entire or bipartite, fleshy. Female flowers: Calyx as in the 
male. Disk adnate to the inner side of the sepals. Ovary 3-celled ; 
styles 3, bifid or bilobed, at first erect, at length spreading and recurved, 
glabrous ; ovules 2 in each cell, collateral, almost hidden from the out- 
side by a very large flat caruncle. Capsule large, subglobose or oblong- 
ellipsoid, septicidal, exocarp partially splitting from each end into Six 
pieces, cocci falling away and leaving the persistent central axis ; exocarp 
crustaceous, thin ; endocarp horny, nearly $ lin. thick, Seeds not seen.— 
Trees. Leaves alternate, petiolate, entire, penninerved. Flowers small, 
racemose or subspicate; racemes simple, axillary or extra-axillary, 
solitary or geminate; flowers subtended by bracts in three series, 
outer ovate, middle cupular and enclosing the flowers in bud, innermost 
obovate. 
~ Species 2, endemic. 
Leaves pubescent on the midrib and lateral nerves below ; 
rudimentary ovary bipartite : . 1. P. stapfiana. 
Leaves glabrous on the midrib and lateral nerves below ; 1 
rudimentary ovary undivided. . ; ; _ 2. P. macrophylla. 
1. P, stapfiana, Hutchinson in Hook. Ic. Pl. t. 2929. A tree about 
50 ft. high; branchlets stout, glabrous. Leaves elongate-oblong OF 
elongate-obovate, rounded or very shortly and obtusely acuminate, prt 
or less narrowed to the base, 6-15 in, long, 3-6 in. broad, thinly eet 
taceous or membranous, entire, glabrous above, pubescent on the miar 
