141 
an 
Revision of Genus Alstonia — MONACHINO 
7(3). Leaves sericeous-pubescent beneath.... 
10. A. neriijolia (typical) 
Leaves glabrous 
10a. A . neriijolia var. glabra 
8(1). Corolla lobes long, about 9 mm. long, 
corolla tube about 2 cm. or more 
long; petioles about 1 cm. long; lobes 
of gland much narrower than ovary; 
anthers over 2 mm. long 9 
Corolla lobes short, about 2.5 mm. long, 
corolla tube about 1 cm. long; leaves 
sessile; lobes of gland almost as broad 
and long as ovary; anthers about 1.5 
mm. long 14. A. rupestris 
9(8). Corolla tube inflated at throat, about 2 
cm. long; anthers located at throat, 
their apices almost reaching bases of 
corolla lobes. 12. A. Mairei 
Corolla tube conspicuously constricted 
at throat for a length of about 5 to 6 
mm. below mouth, inflated at about 
Va of its distance from mouth, about 
2.5 to 3 cm. long; anthers located 
below throat, their apices being about 
6 mm. from corolla lobes 
13. A. Curtisii 
Section Mon ur as per mum Monachino, sect, 
nov. 
Sect. Dissuraspermum Benth., ser. Occiden- 
tals Pichon, in Paris Mus. d’Hist. Nat. Bui. 
II, 19: 297. 1947 (pro part.). 
Arbores foliis 3- vel 4-verticillatis; venis 
secundariis foliorum distantibus arcuatis; lobis 
corollae marginibus dextris imbricatis; disco 
annulare et angusto vel obscuro; seminibus ad 
cacumen aliud rotundatis usque ad subacutis, 
ad cacumen aliud acutis usque ad acuminatis, 
cacuminibus comoso-ciliatis. 
Trees. Leaves 3- or 4-verticillate, not micro- 
scopically papillose beneath, the principal lateral 
nerves distant, arcuate near margin and con- 
nected by a faint looping marginal nerve, the 
anastomosing veins and close reticulation mani- 
fest; corolla lobes with right margin overlap- 
ping; disc annular, very narrow or not apparent; 
follicles separate; seeds elliptic, rounded to 
obtuse or sometimes subacute at one end, acute 
to acuminate or caudate at the other, tails not 
forked, faces densely pubescent, ends long-ciliate 
with coma-like hairs, sides short-ciliate to gla- 
brous; placental scar short. 
Type species of the section. — A. spectabilis 
R. Br. 
Schumann, in Engler and Prantl (1895: 139), 
included species belonging in the present sec- 
tion under § Dissuraspermum; King and Gam- 
ble (1907: 435), in key, did likewise under 
the subgenus Dissuraspermum. The two sections 
are without doubt closely related. 
Key to Section Monuraspetmum 
1. Leaves narrowly linear, about 7 cm. 
long and only 1.5 to 3 mm. broad, 
the lateral nerves about 40 pairs, 
1 mm. apart 24. A. linearis 
Leaves not linear, more than 2 cm. 
broad, the lateral nerves less than 
30 pairs, more than 2 mm. apart.... 2 
2(1). Calyx densely gray or rusty-tomentose 
outside; pedicels not long and 
slender; corolla lobes not ciliate or 
hardly so; corolla tube mostly to- 
mentose outside 3 
Calyx puberulent to glabrous, not 
tomentose outside; corolla tube 
glabrous outside; corolla lobes 
mostly ciliate 9 
3(2). Lobes of calyx densely pubescent in- 
side as well as outside, their mar- 
gins thick; stamens inserted near 
middle of corolla tubes 4 
Lobes of calyx glabrous inside or 
sparsely pubescent near apex, their 
margins thin; stamens inserted 
near throat of corolla tube; corolla 
lobes broadly rounded or ovate, 
densely pubescent outside and in- 
side; inflorescent branches and 
pedicels ascending 8 
4(3). Calyx urceolate, the lobes broadly 
ovate, mostly reflexed; inflorescent 
branches and pedicels divaricate.... 
5 
Calyx turbinate, the lobes ovate to 
lanceolate, not reflexed; inflores- 
cent branches and pedicels as- 
cending; corolla densely pubescent 
outside, corolla lobes linear- or 
oblong-lanceolate, about 3 or 4 
times as long as broad. Australia 
and Papua 20. A. Muelleriana 
5(4). Corolla lobes broadly rounded, less 
than 3 mm. long and about as 
