316 Flora of the Malayan Peninsula. 
28. Preer KoTanum, C. DC. in Records Bot. Surv. Ind. VI. 11 
(1912). Branches glabrous, blackish when dry, the spiciferous 1 mm. 
thick ; collenchyma libriform, continuous ; a single central lysigenous 
canal. Leaves shortly petioled ; limb rigid-membranous when dry, 
minutely pellucid-dotted ; up to 12 cm. long and 5 em. wide ; glabrous 
above, velutino-puberulous underneath; elliptic, acutely acuminate, 
the base slightly inequilateral, acute on the shortest, rounded on the 
longest side; penninerved, the central nerve emitting on each side 3: 
ascendent nerves, the uppermost from 31:°5—37:'5 mm., the lowest 
from a little above the base; petiole glabrous, up to 8°5 mm. long. 
Spike: 2 6:4 cm. long, 1 mm. thick ; rhachis glabrous ; bract glabrous, 
elliptic, adnate to the rhachis and free only at the margins, a little 
over 1 mm. long and 0:25 mm. wide; ovary free; stigmas 3, tri- 
angular, acute at the apex. Berry globose, nearly 3 mm. in diam., 
black when dry. 
PERAK: Kota, in the plains, Wray 1947. 
29. PIPER LEPTONEMA, Hook. f. Fl. Br. Ind. V. 91 (1885) excel. 
specimens of Zollinger. Scandent. Branches glabrous, drying brown, 
the spiciferous 1 mm. thick, in those 2 mm. thick collenchyma libri- 
form in distinct thin and laterally widened bundles ; a single central 
lysigenous canal. Leaves moderately long petioled, glabrous; limb 
membranous when dry, minutely pellucid-dotted, about 10°5 cm. 
long and 4:5—6°5 cm. wide in the male, 776—10 cm. long and 4:4— 
5 cm. wide in the female; elliptic, acutely acuminate, the base 
rounded and nearly equilateral; 7-plinerved, the central nerve 
emitting 2 ascendent nerves, the uppermost from 12°5—14:7 mm. 
above the base and having on each side of it 2 nerves free from the 
base, the inner ascendent, the outer subascendent, much shorter and 
thinner than the others; petiole 8°5—12°5 mm. long, sheath basal. 
Peduncle glabrous, very slender, 12°6—14°7 mm. long. Spike: 3 
nearly 9 cm. long, flowers obliquely verticillate; rhachis hirsute with 
no lysigenous canal; bracts oblong, rounded at both ends, adnate, 
very tightly condensed, raised but not thinned at the lateral margins, 
free only at the ends, very minutely puberulous and ciliate, the 
adnate surface containing large lysigenous cells; stamens 3, anthers 
exsert, obovate-elliptic, 4-valvate, shorter than the oblong filaments: 
2 nearly up to 13 cm. long, rhachis and bract as above, ovary 
glabrous, ovate, prolonged at the apex into a short and thick style, 
stigmas 4—5, oblong, subulate at the top. Berry sessile, oblong- 
ovate, with a short and thick style, 4:2 mm. long, black when dry. 
