202 MR. J. G. BAKER ON THE 
3 lin. long ; tube very short ; segments orbicular, much imbrieated. 
Corolla 1 lin. long; segments orbicular. Anthers minute, ovate. 
Ovary globose ; style very short.— Province of Betamena, on the 
banks of streams, Bojer! Gerrard! This may be the briefly de- 
scribed A. floribunda, Roem. et Schultes, A. DC. Prod. viii. 139, 
non Wallich. 
ONCOSTEMUM ARTHRITICUM, n. sp. 
Arbuscula glabra ramis basi cite tuberosis, ramulis gracillimis, foliis 
breviter petiolatis parvis obovatis obtusis subcoriaceis, umbellis axillaribus 
paucifloris, pedicellis elongatis pilosis, calycis segmentis deltoideis, corolla 
segmentis ovatis copiose nigro-punctatis, filamentis coalitis, antheris ex 
tubo stamineo distincte protrusis. 
A small tree, with branches euriously suddenly tuberous at 
the base, the erowded branchlets slender, woody, subterete, 
bright brown. Leaves alternate, spaced along the branchlets ; 
petiole 4 in. long; blade about an inch long, obtuse, narrowed 
gradually from the middle to the base, firm and rigid in texture, 
with fine side veins and copious minute black dots beneath 
Umbels 2-3-flowered, about as long as the leaves ; pedicels very 
slender, 1-j in. long, glandular-pubescent. Calyx about 3 lin. 
long; segments deltoid, about as long as the tube. Corolla ġ in. 
long; segments ovate, copiously dotted with black.  Staminal 
tube campanulate, about as long as the calyx, the anthers pro- 
truding out of it.—Central Madagascar, Baron! (not numbered). 
Mr. Baron has also found (1919) the original type species of this 
genus, O. Commersonianum, A. Juss., of which we had not previously 
any specimens at Kew. 
ONCOSTEMUM PEDICELLATUM, n. sp. 
Arbuscula glabra ramis crassis lignosis, foliis subsessilibus oblanceo- 
latis obtusis coriaceis venis immersis, umbellis 2-4-floris pedunculis pedi- 
cellisque elongatis gracillimis glanduloso-pubescentibus, calycis segmentis 
deltoideis, corolla segmentis ovatis, staminum tubo campanulato ore 5- 
dentato, stylo incluso, stigmate peltato. 
A. small tree with thick woody branchlets. Leaves crowded at 
the tips of the branehlets, 2-3 in. long, under an inch broad, 
obtuse, entire, narrowed gradually from the middle to the base, 
thick in texture, dull green and glabrous on both surfaces, only 
the midrib visible. Peduneles solitary or fascicled in the axils 
of the leaves, especially at the end of the branchlets; umbels 
2-4-füowered; pedicels very slender, about 3 in. long, minutely 
