Pterococcus.] 
CXXVIII. EUPHORBIACE^E. 
309 
(1) P. glaberrimus Hassk. Flora, xxv. 2 ; Beibl. 41. Plukenetia 
corniculata Smith in Nov. Act. Upsal. vi. 4, Hook. fil. F.B.I. v. 464. 
Long slender climber glabrous. Leaves oblong deeply cordate, 
tip caudate-acuminate, edge denticulate, 3*5 in. long, 2 in. wide; 
petioles 1 in. long, slender. Spikes very slender, 1 to 1*5 in. long. 
Bracts lanceolate containing 3 flowers very minute. Fruit of 4 
flattened cocci triangular prolonged into linear wings, ’5 in. long, 
green. Seeds -5 in. long, lenticular sharply keeled all round mottled. 
Hab. Open waste ground, not common. Singapore, Chan Chu 
Kang • Economic Gardens found in clearing abandoned cultivation. 
Malacca, Chabau (Griffith). Distrib. India, Java, Borneo, Amboina. 
Native name : Pina-Pina. Use: as a vegetable. 
61. RICINUS, Linn. 
Shrubby plant, short-lived. Leaves palmate 7- or more-lobed 
serrate alternate. Flowers large in terminal racemes apetalous, 
upper ones male, lower female. No disc. Male calyx splitting 
into 3 to 5 valvate lobes. Stamens very many; filaments connate 
or in branching clusters. Female calyx spathaceous. Ovary 
3-celled; styles bifid feathery. Capsule of 3 bivalved cocci. Seed 
oblong brown mottled silvery. Species 1, probably African, now 
whole w r orld. _ _ _ 
(1) R. communis Linn. Sp. PI. 1007; Hook. fil. F.B.I. v. 457. 
Usually 6 to 8 ft. tall. Leaves 6 to 12 in. long and as wide, 
membranous, lobes oblong to linear, gland-serrate; petioles 4 to 
12 in. long. Racemes 6 in. long. Male flowers -5 in. wide. Capsule 
•5 to 1 in. long. Hab. Villages, cultivated or an escape, probably 
of African origin, now all over warm countries. Native name; 
Jarak. Use : for castor-oil. 
62. HOMONOIA, Lour. 
Stiff willow-like shrubs. Leaves alternate narrow linear. 
Flowers in axillary spikes pendent apetalous small. No disc. 
Males; calyx globose splitting into 3 segments. Stamens numerous 
in a dense globose head of branched filaments; anther-cells divari¬ 
cate. No pistillode. Female flowers; sepals 5 to 8 narrow unequal 
imbricate. Ovary 3-celled, cells i-ovuled. Styles spreading entire 
papillose. Capsule small of 3 smooth 2-valved cocci. Seeds ovoid. 
Species 3 or 4, Indo-Malayan. „ , D T 
( 1 ) H. riparia Lour. FI. Cochmchme, 637; Hook. fil. F.B.I. 
v. 455. 
A willow-like shrub about 8 ft. tall, branches stiff erect. Leaves 
linear-lanceolate or oblong entire, acute; nerves about 12 ascending 
pubescent beneath; 6 or 7 in. long, *25 to *5 in. wide; petioles 'i in. 
long or less. Spikes slender, 5 in- long, pubescent. Bracts small 
ovate acute. Sepals in male oblong purple, in females ovate- 
lanceolate. Capsule -12 in. wide, pubescent brown sub-sessile. 
