2 ASCENDING PART. HERBAGE. 



intrafoliaceous (withinside of the leaf), as in 

 Grasses, fig. 141, and Potygonum, as well as the 

 tribe called Rubiacetf, fig. 198, 199- In some of 

 the latter they are divided, or compound. Some 

 Stipulas are soon deciduous, others permanent as 

 long as the Leaves. This organ is by no means 

 universal, even in the same genus, as Cistus; nor 

 constant in the same species, as Salix. 

 i. Bractea, the Floral Leaf, a leafy appendage to 

 the Flower, or its Stalk (17, 19), is often co- 

 loured ; either deciduous, or as permanent as 

 the Flower-stalk, to which it is sometimes firmly 

 attached. 



3. Spina, a Thorn, originates in the wood itself, 

 and by culture in rich soil, disappears, becoming 

 a branch. Footstalks (23) sometimes harden 

 into spines ; as do Stipulas (47 : 1) in Xanthium ; 

 and Flower-stalks (19) in Pisonia. 



4. Acukus, a Prickle, arises from the bark only, 

 as in Roses, and does not disappear by culture. 



1 Cirrus, a Tendril, a true fulcrum or support, is 

 either axillary, or terminates a Leaf (42) or a 

 Footstalk (2 3) or even a Flower-stalk (19), serving 

 to sustain weak stems upon others. Tendrils, at 

 first straight, soon turn spirally, and in some in- 

 stances turn again, in the contrary direction. They 

 are simple or branched ; their extremities often 

 dilated and adhesive. The fibrous supports of 

 Ivy are peculiar Tendrils, not Roots. Foot- 



