154 



STUDIES IN INDIAN SUGARCANES 



Character 



Sarotha Group 



tSunnabile Group 



Ligule. This is narrow in both 

 groups although there ap- 

 pear to bo clifTeroncos. The 

 setae are v^ery dififorent. 



Clasping stem. The sheath 

 clasps the stem more widely 

 in the Saretha group. Mea- 

 surements taken in terms of 

 the circumference. 



Width at base. The sheath is 

 wider at the base in the Sun- 

 aabile group. 



Width at apex, also rather 

 greater in the Sunnabile 

 group, but widest in the Mes- 

 angan section. 



Length of mature leaf sheath. 

 There is little difference in 

 the groups in 1917. but in 



VI. Leaf Sheath — condd. 



The middle portion usually 

 widens out so as to form a 

 small, well defined lozenge. 



Setffi very minute, irregular, 

 sparse and often absent. 



1916, 



groups m 

 1916 the sheaths are 

 in the Saretha series. 



onger 



Sheath module (length di\dded 

 by width) is greater in the 

 Saretha group. 



Num.ber of sheaths in the cane, 

 greater in Sunnabile. 



Length of leaf sheath in differ- 

 ent parts. This is best 

 studied in the curves on 

 Chart III. 



Channelling. This is more 

 marked in the Saretha series 

 and the lamina takes part in 

 it here. 



Callus, shaggier and more 

 marked in the Siuinabile 



Scabrous feel at the tip, more 

 marked in the Sunnabile 

 group. 



1-45 



1917, Katha section, "j 



1 '48 I average 

 Mesangan section , J 1 46 

 1-43 j 



1916, 3 09" 



1917, Katha section,! 



2 79" I avers 

 Mesangan section, r2 93" 

 316" 





1-23" 



1916, 



1917, Katha section, "j 



lll"t 

 Mesangan section, I 1 22" 



1-40"J 



average 



1916, 12-4" 



1917, Katha section, "\ 



10'74" I average 

 Mesangan section, | 11 '95" 

 13-84"j 



The upper and lower margins 

 are more or less parallel, and 

 a lozenge is not present. 



Seta; strongly developed, usu- 

 ally longish and with i.solatcd 

 longer hairs in the middle. 



1916, 1-35 



1917, 1-39 



1916, 



4 



1917, Katha section, ^ 



3 "8 I average 

 Mesangan section, j"4'l 

 4 -4 J 



1916, 35 



1917, 29 



The curves resemble those of the length of joint. The aver- 

 age length and the extremes are greater in Saretha : there is a 

 higher start, a more rapid rise and a st«eper fall. 



VII. — Lamina 



Marked, especially in the mid- 

 rib, but the lamina takes 

 part at the base, especially in 

 the Mesangan section. 



Not well marked, usually cov- 

 ered by waxy granules and 

 often thinly pubescent or 

 puberulous. 



Not marked, either ventrally 

 or dorsally. 



Not very marked and confined 

 to the midrib. 



Well marked, with dense, often 

 shaggy pubescence, and some- 

 times long hairs at the sides. 



Strongly developed ventrally 

 and less so dorsally. 



