\ 
~ Poryconum.] POLYGON ACES. 37 
Peduncles quite glabrous. Racemes erect, slender, weak, 2-4 in. long ; 
bracts crowded, glabrous, margins sparingly and shortly ciliate. 
Perianth white, eglandular. Stamens 5-8. Styles 3-cleft. Nutlets 
_ trigonous. 
Common within the area usually in wet places. Distris.: Hotter parts 
of India from Assam and Bengal to the N. W. Frontier, and from the 
Cent. Prov. to 8. India and Ceylon; also in Burma extending to the 
Malay Peninsula, China, Japan, Trop. Africa and Australia. ‘This 
species differs from P. serrulatum by the acute base of the leaves and 
by the much longer bristles of the stipules; the leaves also turn 
brown when drying. Watt mentions that in China and Japan this 
plant yields a blue dye similar to that of indigo. 
9. P. serrulatum, Lagasc. Gen. and Sp. Pl. 14; F. B. I. v, 38; 
Prain Beng. Pl. 887 ; Gage l. c. 399 ; Cooke Fl. Bomb. ii, 515. P. 
flaccidum, Roxb. Fl. Ind. ii, 291 (not of Meissn. or Boiss).—Vern. 
Panimirch. 
An annual. Stems prostrate and rooting below ; branches 2-4 ft. high, 
glabrous, often reddish. Leaves subsessile, drying green, 2-5 in. long,’ 
linear or clliptic-oblong, acute or acuminate, glabrous or sparsely 
hairy on upper surface and midrib ; base rounded or cordate ; stipules 
strigose ; mouth truncate, with bristles on the margin nearly as long 
as the tube. Racemes panicled, slender, erect, 3-2 in. long ; bracts 
glabrous, strongly and often squarrosely ciliate. Perianth white, 
zs in. long, eglandular. Stamens 5-8. Styles 3, connate below. 
Nutlets trigonous, +5 in. long, polished. 
Common within the area in swamps and by river-banks. DustTR1e. : 
From Assam and Bengal to the Indus, ascending to 7,000 ft. on the 
W. Himalaya ; also in Central and S. India and in Ceylon ; extending 
to Burma, China, the Malay Pen., W. Asia, 8. Eur., Africa, America 
and Australia. 
10. P. Hydropiper, Linn. Sp. Pl. 361; Royle Ill. 317; F. B. 1. 
v, 39; Watt BE. D. ; Collett Fl. Siml. 423 ; Prain Beng. Pl. 887 ; 
Gage l. c. 401.—Water-pepper. 
A rather robust glabrous annual. Stems much-branched, minutely 
glandular, 12-18 in. high, swollen at the joints, prostrate and rooting 
at the lower nodes. Leaves shortly stalked, rarely more than 3 in. 
long, lanceolate or oblong-lanceolate, variable in width and in the 
length of the apical portion, usually covered with impressed glands 
glabrous or with the midrib scabrid beneath ; stipules glabrous or 
