Revision of Genus Alstonia — MONACHINO 
159 
long, glabrous outside or with some scattered 
hairs on upper part; corolla lobes 3-6 mm. 
long and 2-3 mm. broad, acute at apex, ciliate; 
anthers 2-2.2 mm. long; stigma-apiculi about 
0.5 mm. long; lobes of disc about length of 
ovary, 1.5 mm. long; follicles about 3-4 cm. 
long, sometimes lightly constricted at intervals. 
Seeds comparatively very thick (about 0.6 mm. 
thick), strongly and closely muricate, the cilia 
very pale brown. 
Type. — "In woods on hills west of Yunnanfu. 
Alt. 7-8000 ft. Feb. 1905. G. Forrest 592. 
(From about the same locality also Ducloux, 
20th Apr. 1904.)” 
DISTRIBUTION. — China, Yunnan, and Kwei- 
chow; high altitude (reported from 1,600 m. 
to 2,000 m., rocky places, mountain slopes). 
Yunnan. — Maire 138 and 395 (Mi Tsao; 
A); Henry 9779 (Meng Tzi Mrs.; A, NY, US), 
13244a (Szemao; A, Mo, NY); Handel-Maz- 
zetti 6089 (near Yunnan Fu; A) ; Forrest 16177 
(A), 9930 (Koia Kuan Valley; BM, K, UC); 
McLarren C. 173 (K); Hsiang and Wang 
16323 (Ta-p’o-chi, Kun-Ming; A); Wang 
72241 (Chen Kang Hsien; A), 62906 (Kun- 
Ming; A). 
Kweichow. — Esquirol 740 (type coll. A. 
Esquirolii', fl.; A); Hsiang 8508. 
Type of Alstonia Esquirolii. — "Kouy-tcheou, 
aout 1905 (Jos. Esquirol 740).” 
Type of Acronychia Esquirolii (fide Reh- 
der). — "China. Kweichou: ruisseau derriere 
Bo-ly et chemin de Keou-tin, J. Esquirol 3212, 
June, 1911.” Examined by Rehder (1934: 
315) and Tsiang (1936: 138), who place it in 
synonymy of Alstonia yunnanensis. 
§ MONURASPERMUM 
Trees, sometimes 20-25 m. tall. Leaf blades 
more or less acuminate at apex, usually varying 
from completely glabrous to densely pubescent 
beneath, the lateral nerves usually 15-20 pairs, 
5-10 mm. apart. Calyx lobes pubescent or at 
least ciliate; corolla tube 3-6 mm. long, the 
lobes bearded at base within with linear or 
clavate hairs; anthers 0.6- 1.3 mm. long, located 
at middle or up to throat of corolla tube. Fol- 
licles long; seeds brown, 5-9 mm. long and 1-2 
mm. broad, the cilia silky-maroon, variable in 
length, 5-18 mm. long; cotyledons narrow. 
The leaves and fruits are often very similar 
in different species; flowers are necessary for 
precise identification. 
Siam to the Solomon Islands; often common. 
16. Alstonia angustifolia Wall. ex. A. DC., 
Prodr. 8: 409. 1844. 
A. angustifolia Wall., Num. List n. 1650. 
1829. 
Amblyocalyx Beccarii Benth. in Hook., Ic. 
PI. 12 (3d ser. 2): t. 1179. 1876. 
? Alstonia angustifolia var. elliptica King & 
Gamble, in Jour. As. Soc. Beng. 74 (2): 
441. 1907. 
A. Beccarii Pichon, in Paris Mus. d’Hist. Nat. 
Bui. II, 19: 297. 1947. 
Trees up to 20 m. tall. Petioles 1-2 cm. 
long; leaf blades 8-19 cm. long and 2-6 cm. 
broad, the lateral nerves about 15 pairs, 8-12 
mm. apart. Inflorescence with branches and 
pedicels divaricate, closely pubescent; calyx 
tube about 1.2-1. 3 mm. long, about 2 mm. 
or less broad; calyx lobes very densely tomen- 
tose outside and inside, usually spreading or 
reflexed; corolla tube 3-3.5 mm. long, densely 
tomentose outside; corolla lobes broadly 
rounded, 1. 2-2.5 mm. long and 1. 4-2.2 mm. 
broad, densely tomentose outside and inside; 
stamens inserted slightly above middle of 
corolla tube. 
Type. — "Wall, list 1650. Singapore,” 1822. 
Illustrations. — H ook., Ic. PI. (1876) 12: 
t. 1179 (as Amblyocalyx Beccarii ; leafy br. 
and infl., fl., fl. analysis; representation of 
ovules as 2 per cell suspended from near apex 
is erroneous). 
Distribution. — Malay Peninsula, where fre- 
quent in the southern states, to Sumatra, Bangka, 
and Borneo; usually in moist places at low alti- 
tudes. 
Malay States. — Alvins 668 (Malacca; Sing); 
Corner 21307 and 31452 ( Johore; Sing) ; Derry 
1080 (Malacca; Sing) ; Maingay 1066 (Penang; 
fl.; mixed with var. latifolia; GH, L); Ridley 
