This is a joy to critique. A great poem with a few problems, perfect for a workshop!
First, why it's good: you do the hard thing, describe a complex landscape and bring it to life. And now, a few suggestions for improvement:
QUOTE (anaisa @ Nov 1 15, 15:59 )

Pastoral for the Midlands
The heart-shaped linden leaves have netted veins,
Extending from their midrib in the center;
this is redundant. It's the MID rib, so of course it's in the center.
Their blades are broad with scalloped edges, catching
October’s sun, as filmy light rays enter
Between long layered branches. By the Severn,
We walk the well-worn, narrow bridleways.
Our trail is trimmed in sedges, maples drop
Their dappled leaves in paper-thin arrays,
To fan the feet of ancient brambles. Roots
Rise from a hidden ditch; the sun burns off
Earth’s rim of mist; a patch of peacock blue
Appears above a whitewashed mill. Clouds doff
Their salutations to the sky. The bleats
you can only doff a hat or perhaps some other article of clothing. maybe you could say they doff "as" or "in" salutation
Of farmland sheep float through the country air.
A passing steam train lets its whistle out
As we rest by the waters of the weir.
This place is far from what I’m used to. Thick
With large leaved limes and sycamores . . . My home
Is scorching desert and mesquite; stretched suns
Lay ribbons dipped in scarlet strands that comb
Through warm horizons. But lush emerald hues,
Medieval bridges, plentitude of calm—
No sand dune is superior to these.
The blends of meadow-breeze, the water’s balm,
Brushstrokes of nature, delicate as sorrel,
Create a mental mural for my mind.
you've done so much work painting this mental mural, it seems unfair to sum it up so mundanely. and "mental" and "for my mind" is redundant.
And there I find the time to pause, reflect,
When harshness of the desert seems unkind.
having no "the" before harshness feels awkward. I don't think you have to be so chained to the meter to drop expected articles.
as I said, you did the hard work, making a picture with words. I hope my comments help.