Revision of Genus Alstonia — MONACHINO 
157 
The data appearing on the labels of the her- 
barium material are poor; perhaps some of the 
Indian collections with longer corollas are from 
cultivated plants originally derived from Java, 
thereby confusing the true picture of morpholo- 
gical elements present in the native Indian speci- 
mens. If A. neriifolia from the Himalayas and 
A. sericea from Java are truly identical, the 
geographical distribution of the species is 
anomalous. There are indications that Hima- 
layan elements sometimes extend to western 
Java in a discontinuous fashion, but such a dis- 
tribution in A. neriifolia would display a habit 
contrary to that of § Blaberopus, which is note- 
worthy for localization of its species. However, 
with the specimens now at hand there is no 
alternative but to consider A. neriifolia and 
A. sericea conspecific. 
10a. Alstonia neriifolia var. glabra Mona- 
chino, var. nov. 
A forma typica speciei foliis inflorescen- 
tiisque glabris recedit. 
Type. — J. S. Gamble 7574, Northeast India, 
Sikkim, Darjeeling; Dec. 1879; fruiting. 
( Kew. ) 
Distribution. — India: Gamble 7 57 4 (type). 
United States: Florida: Bor. PL Intr. 65248 
(Chapman Field, ex Darjeeling; cult.; fl. and 
fr.; US). 
11. Alstonia Sebusi (van Heurck & Muell. 
Arg.) Monachino, comb. nov. 
Blaberopus Sebusi van Heurck & Muell. Arg., 
in van Heurck, Obs. Bot. 2: 188. 1871. 
Leaves and fruits as in A. venenata var. 
pubescens. Differs in the flowers; corolla tube 
about 1 cm. long; corolla lobes about as broad 
as long, very short, about 2 mm. long, the 
margins rumpled and inrolled; stigma-apiculi 
sharp. 
Type. — "India orientali: Griffith 2343. (In 
hb. van Heurck.).” 
Distribution. — Himalayas; apparently rare. 
Bhutan: R. E. Cooper per A. K. Bulley 
(7/9/14; fr.; BM); Griffith 2343 (type coll.; 
fl. and fr.; K). 
The type collection of Blaberopus Sebusi 
consists of an infrutescence disjointed from a 
leafy branch with flowers. These were examined 
by Bentham, who decided that the species was 
a mixture, the fruits being of A. venenata and 
the flowers of A. neriifolia. The species thence- 
forth fell into discredit and has not been recog- 
nized until now. 
There is no justification for believing that 
the type of B. Sebusi is a mixture. A careful 
examination of the type of indumentum and 
other individual features in the calyces and 
pedicels of the fruiting and the flowering ma- 
terial proves almost with certainty that the two 
parts belong to the same collection. Further- 
more, the flowers are not of A. neriifolia but 
of a distinctive element. The discovery in Yun- 
nan of a variety in which the A. venenata kind 
of fruits is associated with the same distinctive 
flowers found in the type of B. Sebusi, is addi- 
tional proof. 
Only a single specimen of flowering material 
has been examined in the species, and here the 
flowers are not fully matured. The stigma- 
apiculi are about 0.5 mm. long and the anthers 
1.6 mm. long. 
11a. Alstonia Sebusi var. szemaoensis Mona- 
chino, var. nov. 
A forma typica speciei foliis inflorescentiisque 
glabris recedit. 
Type. — A. Henry 11932, China, Yunnan, 
Szemao, w. mts., about 1500 m. (Kew, pre- 
sented by Dr. A. Henry in 1898.) 
Yunnan: Szemao: A. Henry 11932 (type; 
fl.; K), 13244 (fr.; A, K, US). 
12. Alstonia Mairei Leveille, Cat. PI. Yun-Nan 
9. 1915. 
Wikstroemia Hemsleyana Leveille, in Bui. 
Geog. Bot. 25: 41. 1915. 
Alstonia pauper a Hand.-Mazt., in Anz. Akad. 
Wiss. Wien. 57: 241. 1920. 
Petioles about 1 cm. long; leaf blades re- 
sembling those of A. venenata but usually 
smaller, 5-10 cm. long and 1-2 cm. broad, 
oblanceolate, glabrous, the lateral nerves 30-40 
