Revision of Genus Alstonia — MONACHINO 
153 
of this intergradation and the lack of any other 
distinguishing feature the variety is not recog- 
nized. 
Type of A. iwahigensis. — "1 3167, A. D. E. 
Elmer, Puerto Princesa (Mt. Pulgar), Palawan, 
May, 1911, Philippines. Of the species only 
one tree was found in fertile soil of humid 
forests at 750 feet alt. along the trail to Napsan 
on the opposite coast of the island.” The in- 
florescence is somewhat more congested, and the 
calyx lobes are slightly longer and sharper at 
the apex than is usual for A. angustiloba. 
The Palembang material which has been dis- 
tributed under an unpublished name attributed 
to Backer in manuscript belongs with A. an- 
gustiloba. 
6. Alstonia pneumatophora Backer ex L. G. 
Den Berger, in Meded. Proefst. Thee 97: 
153. 1926. Ex K. Heyne, Nutt. PI. Ned.- 
Ind. ed. 2, 2: 1277. 1927. 
Foliis his A. spatulatae consimilibus et flori- 
bus his A . angustilobae consimilibus; folliculis 
furfuraceo-rubiginoso-puberulis pilis minutis 
crispis. 
Trees up to 45 m. tall and 1 m. in diameter. 
Petioles 0-7 mm. long; leaf blades spatulate, 
rounded or slightly retuse or faintly blunt- 
acuminate at apex, 4-11 cm. long and 2-4.5 
cm. broad, the lateral nerves 20-35 pairs, 2-4 
mm. apart, often a little ascending, lightly 
arcuate, the transverse veins and reticulation 
usually obscure. Inflorescence with many 
crowded flowers, puberulent, the pedicels very 
short; flowers closely resembling those of A. 
angustiloba\ calyx lobes 1.4— 1.9 mm. long, 
puberulent outside and inside; follicles scurfy 
rusty-puberulent with minute crisped hairs. 
Lectotype. — Boschproefst. 28 E. 1 P. 505, 
Sumatra, Palembang; fl. and fr. (Leiden.) 
Illustrations. — Meded. Proefst. Thee 
(1926) 97: t. 29, fig. 113 (wood anatomy). 
Distribution. — Sumatra, Borneo, and Cele- 
bes; moist habitat. 
Sumatra: Boschproefst. 418 (Palembang; 
K, L, Sing), 502 (Palembang; L), 505 (type 
coll.; Palembang; K, L, P), 511 and 512 (Palem- 
bang; L), 536 (Palembang; L, UC), Grashoff 
785 (Palembang; L), Neth. Ind. For. Serv. 
19853 (Ophir; A), 19860 (Ophir; L), 23838 
(Palembang), 31007 (Tapanoeli; A), Yates 
842 (Asahan; A). 
Riouw: Boschproefst. 6304 (Karimon; L), 
9965 (L). 
Borneo: Abubakar 4236 (Beaufort; Sing), 
Bartlett (Sarawak; BM), Haviland 1689 (Sara- 
wak; K, Sing), Neth. For. Serv. 16089 (L), 
17783 (A). 
Celebes: Boschproefst. Cel/111/51 (L), 
Cel/ 111/ 130 (A). 
Vernacular names. — Heyne reports the 
following: Basoeng, Poelai Kapoer, Poelai 
Renah. Pulai Lilin (Brunei) appears on an her- 
barium label. 
This species has not hitherto been described 
taxonomically, therefore a Latin diagnosis has 
been included. Berger treated the wood 
anatomy, whereas Heyne presented some gen- 
eral features such as habit, habitat, pneuma- 
tophores, wood, and uses. 
6a. Alstonia pneumatophora var. petiolata 
Monachino, var. nov. 
A forma typica speciei petiolis elongatis 
usque ad 2.5 cm. longis recedit. 
Differs from the typical form in its very long 
petioles, which are about 2 cm. long; the leaf 
blades are somewhat less spatulate, the lateral 
nerves about 23 pairs, 3-4 mm. apart. 
Type. — Fndert 28 F. 1 P. 537, Archipel. Ind. 
Sumatra, Palembang, (Leiden.) 
7. Alstonia spatulata Blume, Bijdr. 1037. 
1826. 
A. cuneata Wall., Num. List 1645. 1829 
(nom. nud.). 
A. cuneata Wall, ex G. Don, Gen. Syst. 4: 
87. 1837. 
A. cochinchinensis Pierre ex Pitard, in Le- 
comte and Humbert, Fl. Gen. Indo-Chine 
3: 1165. 1933 (pro synon.). 
Trees seldom greater than 15 m. tall (re- 
ported 30 m. or more) and 50 cm. in diameter. 
