216 RHAMNACEAE. 
MIGRORHAMNUS. 
(Family Rhamnaceae). 
Intricately branched shrubs of 
the southwest: deciduous. Twigs 
glabrous, terete, slender, with 
short internodes, spine-tipped: 
pith minute, roundish, continu- 
ous. Buds solitary or collaterally 
branched in spine formation, ses- 
sile, minute, round, appressed, 
quickly developing into short 
foliage spurs on which numerous 
stipular scales persist for a long 
time. lLeaf-secars alternate, more 
or less raised, crescent-shaped, 
minute: bundle-trace 1, indistinct: 
stipules persistent, minute, trian- 
gular. The very small leaves, 
when present, are closely revolute 
to the midrib as in Loiseleuria 
and some other Ericaceae and in 
some Empetraceae. 
Like the_ preceding’ genus, 
Microrhamnus often forms dense masses of chaparral. 
Twigs with light gray splitting epidermis. M. ericoides. 
