184 KINDS OF STIPULES. 
form one stipule, as in the Astragalus, they are then said to be 
synochreate or opposite ( fig. 380, s) ; if under similar circumstances 
they cohere by their inner margins, as in Melianthus annwus and 
Houttuynia cordata (fig. 381, s), they form a solitary stipule 
which is placed in the axil of the leaf, and is accordingly termed 
axillary ; and if such stipules cohere by both outer and inner 
Fie. 380. . Fie. 381. 
Fig. 380. A portion of the stem, 7, and leaf, 7, of the Astragalus Onobrychis. 
s. Synochreate or opposite stipule-—Fig. 381. A portion of the stem, 7, 
and leaf, 7, of Houttuynia cordata. s. Axillary stipule. 
margins so as to form a sheath which encircles the stem above 
the insertion of the leaf (jig. 273, d), as in the Rhubarb, and 
most other plants of the order Polygonacez, they form what is 
termed an ochrea or intrafoliaceous stipule. 
All the above kinds of stipules occur in plants with alternate 
leaves, in which such appendages are far more common than in 
Fig. 382, 
Fig. 382. A portion of a branch, 7, with two opposite leaves, 7, 7, of Cephal- 
anthus occidentalis. s. Interpetiolar stipule. 
those with opposite leaves. When the latter plants have stipules 
these are generally situated in the intervals between the petioles 
on each side, and are hence termed interpetiolar. In such cases, it 
frequently happens that the opposing stipules of each leaf cohere 
more or less completely by their outer margins so as to form but 
one interpetiolar stipule on each side of the stem (fig. 382, s), 
as is the case in the Cinchonas, the Coffee, and most other 
plants of the natural order Rubiacez to which they belong. 
