OEGA>-S OF JTCTEITION. 



171 



ingly. Thus, wlieii they adhere on each side to the base of the 

 petiole, as in the Eose {fig. 352, s, s), they are said to he adnate, 



Fig. 352. 



Fig. 353. 



Fio. 352. A portion of a branch, r, of the common Rose {Bosa canind). a. 

 A prickle. 6. Bud in the axil of a compound leaf /. p. Petiole, s.s. Ad- 

 nate or adherent stipules. Fig. 353. Leaf of Pansy {Viola tricolor) 



•with large caulinary stipules at its base. 



adherent, or petiolar. TVTien they remain as little leaflets on each 

 side of the base of the petiole, but quite distinct from it, as in 

 many Willows {fig. 248, s, s), and Pansy {fig. 353), they are 

 called caulinary. When the stipules are large, it sometimes 

 happens that they meet on the opposite side of the stem from 

 which the leaf grows, and become united more or less by their 

 outer margins, and thus form one stipule, as in the Astragahis ; 

 they are then said to be synochreate or opjjosite {fig. 354, s); if 

 under similar circumstances they cohere by their inner margins, 

 as in Melianthus annuus and Routtuynia cordata {fig. 355, s), 

 they form a solitary stipule which is placed in the axil of the 

 leaf, and is accordingly termed axillary ; if such stipules cohere 

 by both outer and inner margins so as to form a sheath which 

 i encircles the stem above the leaf {fig. 247, d), as in the Ehubarb, 

 and most Polygonacese, they form what is termed an ochrea or 

 intrafoliaceous stipule. 



All the above forms of stipides occur in plants with alternate 

 leaves, in which such appendages are far more common than in 

 those with opposite leaves. When the latter have stipules it 



