0 on a plant, the angle between the top of a leaf or stem and the stem or branch that it grows from --
Flowers are borne in groups of 2 or 3 in the axils of the leaves.
Tubercules are four-sided, with latex and the axils have dense white wool.
The inflorescence is a small, spherical flower head less than a centimeter wide located at the tip of the stem or in a leaf axils.
Flowers occur in a terminal cyme and sometimes in leaf axils.
It has irregular straggling branches and stiff twigs and long spines at the leaf axils.
Their flowers are sessile and generally solitary, but sometimes in pairs in the axils of the upper leaves.
They are borne in long, drooping, sessile or pedunculate catkins produced from buds formed in the axils of the leaves of the previous year.
The flowers are solitary in upper axils; they lack a calyx and have a pinkish-buff corolla with long, yellowish stigmas.
