293 
Staff. — On the Sonerileae of Asia. 
appear in Cogniaux’s monograph under four sections : — 
Genuinae , Sonerilopsis , Oxycentria , Anomalae . Sonerilopsis 
comprises three, Oxycentria one, Anomalae three species. Of 
these, each of the species of Anomalae belongs, in my opinion, 
to a different genus ; Oxycentria is known only from a de- 
scription by Miquel, and is very doubtful ; Sonerilopsis forms a 
very natural division, whilst Genuinae consist of rather hetero- 
genous elements which point at least to two different lines of 
descent. The greatest complication is exhibited within the 
section Genuinae , and especially in their first sub-division, 
which is characterised as ‘ caulescentes ; folia consimilia, in 
eodem jugo subaequalia,’ and comprises forty-five species. In 
discussing them I shall not follow the sequence of Cogniaux’s 
monograph, but dispose them in the arrangement which ap- 
pears to me the most natural. 
SONERILA, Roxb. 
Distrib. : Western Ghats, from Bombay southwards ; Cen- 
tral and South-west Ceylon ; Chota Nagpore ; tropical and 
sub-tropical Himalaya from Kumaon eastwards ; from the 
Khasia Mountains and Assam eastwards to South China, and 
throughout the Eastern peninsula ; Malayan Archipelago to 
New Guinea and the Philippines. 
T. Group of S. zeylanica. Central and South-west Ceylon ; 
the most southern part of the Western Peninsula ; Borneo. 
i. S. zeylanica , W. et Arn. (Syn. S. pumila, Thw., rostrata , 
Thw., cor difolia, Cogn., rhombifolia , Thw., glaberrima , Arn., 
affinis , Arn.), Central and South-west Ceylon ; Borneo. 
S. zeylanica was originally established by Wight and Arnott 
on specimens from Ceylon. Two years later Arnott described 
two more species in Hooker, Comp. Bot. Mag. 30 7 : S', affinis 
and S. glaberrima. To these were added S', rhombifolia , ro- 
strata, and pumila by Thwaites, in Enum. Plant. Zeyl. 109 
(1859), and S. cor difolia by Cogniaux in his monograph, all 
found in Ceylon. Of these seven species, only S. zeylanica , 
affinis , and rhombifolia were admitted by C. B. Clarke in 
Hooker, Flora of British India, II. 530. Cogniaux, how- 
