810 ON NAIAS GRAMINEA DEL., VAR. DELILEI MAGNUS. 
the stem and half-clasping it (figs. 52 to 55). The 
extremity of the leaf is gradually attenuated, and ends 
\ in from one to three spines (fig. 48) ; the extremities 
{ are frequently truncate, so that the spines give it a 
cuspidate character (fig. 44). 
he margins of the sides, sheath, and free ex- 
The spines are acuminate, slightly curved, and gradually 
' narrowed from the base to the sharp point. 
A 
f VI.—Tue Lear-spines. 
he form of the spine, or tooth, on the margin 0 
the leaf furnishes good discriminating characters be- 
tween the va 
Fig. 44. po: 
Fig. 46, Fie. 47. 
