  We study the flow of elongated grains (wooden pegs of length $L$=20 mm with
circular cross section of diameter $d_c$=6 and 8 mm) from a silo with a
rotating bottom and a circular orifice of diameter $D$. In the small orifice
range ($D/d<5$) clogs are mostly broken by the rotating base, and the flow is
intermittent with avalanches and temporary clogs. Here
$d\equiv(\frac{3}{2}d_c^2L)^{1/3}$ is the effective grain diameter. Unlike for
spherical grains, for rods the flow rate $W$ clearly deviates from the power
law dependence $W\propto (D-kd)^{2.5}$ at lower orifice sizes in the
intermittent regime, where $W$ is measured in between temporary clogs only.
Instead, below about $D/d<3$ an exponential dependence $W\propto e^{\kappa D}$
is detected. Here $k$ and $\kappa$ are constants of order unity. Even more
importantly, rotating the silo base leads to a strong -- more than 50% --
decrease of the flow rate, which otherwise does not depend significantly on the
value of $\omega$ in the continuous flow regime. In the intermittent regime,
$W(\omega)$ appears to follow a non-monotonic trend, although with considerable
noise. A simple picture, in terms of the switching from funnel flow to mass
flow and the alignment of the pegs due to rotation, is proposed to explain the
observed difference between spherical and elongated grains. We also observe
shear induced orientational ordering of the pegs at the bottom such that their
long axes in average are oriented at a small angle $\langle\theta\rangle
\approx 15^\circ$ to the motion of the bottom.
