476 SIR JOHN LUBBOCK ON STIPULES, 
within the other, or within the stipules of one another. The 
leaflets are conduplicate and parallel, and by the circinate cur- 
vature of the petiole they are brought down and lie between 
their own stipules in their early stages. Each successive leaf 
behaves in the same way. The flower-buds are axillary and 
likewise covered by the stipules in their earlier stages. 
In Oxalis oregana, Nutt., the arrangement is similar to that 
of O. corniculata, but the pedestals are larger and much dilated 
towards the base. 
In O. pubescens, H. B. & K., the stipules are more prominent 
and well developed. They are adnate to the edge of the pedestal, 
membranous, hairy on both surfaces, colourless, and persist long 
after the leaves have fallen. 
Irmisch, Th., in Bot. Zeit. 1874, describes and figures the 
stipules. 
LInace®. 
In the small closely allied natural order Linacex stipules may 
be present or absent. 
In Radiola absent. 
In Linum absent or present as glands. 
In Reinwardtia foliaceous, but often very small. 
Trelease, in his Revision of the North-American Linacee 
(Trans. St. Louis Acad. of Science, vol. v. no. 1, 1887), uses the 
absence of stipules or the presence of stipular glands in his 
subdivision of the genus Linum. 
SIMARUBEA. 
In compensation for the absence of stipules the buds are scaly ; 
petioles dilated at the base. 
Picrena excelsa, Linn.—The leaves are alternate, petiolar, ex- 
stipulate, imparipinnate, coriaceous, glabrous, persistent, with 
elliptic leaflets of unequal size, the uppermost being the largest ; 
petioles semiterete in the upper half, and shallowly grooved on 
the upper face, terete downwards, dilated and thickened at the 
base, thinly pubescent with adpressed hairs. 
The terminal buds in the resting stage (in the specimen 
examined) were covered at the base of the petiole by one or two 
of the last developed leaves, of which one may have fallen away, 
1eaving a persistent pedestal, and also by two or more leaves 
reduced to the condition of scales. The latter consists of the 
