LEGUMINOSAE. 141 
PARKINSONIA. 
(Family Leguminosae). 
Small trees with brown trunk 
and greenish twigs: evergreen or 
deciduous. Twigs moderate, 3- 
sided and more or less striate: 
pith moderate, roundish, continu- 
ous. Buds solitary, or superposed 
with the lower developing into 
an inflorescence, minute, indis- 
tinctly few-scaled. lLeaf-scars al- 
ternate, somewhat raised, 3-lobed 
or broadly crescent-shaped, with 
3 indistinct bundle-traces; or the 
spinescent rachis persistent, bear- 
ing spiny stipules and marked by 
leafiet-scars below. Leaves, when 
present, with a few pairs of long 
narrow pinnae with flat rachis 
and many small oblong pinnules. 
Like Caragana, Parkinsonia 
has the rachis of its compound 
leaf transformed into a persistent 
spine, and on this the former position of the fallen leafiets is 
marked during the winter by the scars caused by their 
abscission. 
Glabrous: evergreen. (Jerusalem Thorn). (1). P. aculeata. 
Puberulent: deciduous. (Retama). P. Torreyana. 
