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Let $(\Sigma,p)$ be a pointed Riemann surface of genus $g\geq 1$. For anyinteger $k\geq 1$, we parametrize the space of meromorphic quadraticdifferentials on $\Sigma$ with a pole of order $(k+2)$ at $p$, having aconnected critical graph and an induced metric composed of $k$ Euclideanhalf-planes. The parameters form a finite-dimensional space $\mathcal{L} \cong\mathbb{R}^{k} \times S^1$ that describe a model singular-flat metric aroundthe puncture with respect to a choice of coordinate chart. This generalizes animportant theorem of Strebel, and associates, to each point in a decoratedTeichm\"{u}ller space $\mathcal{T}_{g,1} \times \mathcal{L}$, a unique metricspine of the surface that is a ribbon-graph with $k$ infinite-length edges to$p$. The proofs study and relate the singular-flat geometry on the surface andthe infinite-energy harmonic map from $\Sigma\setminus p$ to a $k$-prongedgraph, whose Hopf differential is that quadratic differential.

Quadratic differentials, half-plane structures, and harmonic maps to graphs