 | Knowlton Hop Hornbeam, Western Hop Hornbeam, Wooly Hop Hornbeam, Ironwood Ostrya knowltonii Betulaceae Knowlton or western hop hornbeam is an uncommon small tree found at high elevations in the northern Trans-Pecos. It is found in canyons of the Guadalupe Mountains. Plant Habit or Use: small tree Exposure: sun Flower Color: reddish-brown Blooming Period: spring Fruit Characteristics: cone-like cluster of small nuts enclosed in bladder-like sacks, resembling hops. Caution! Contains stinging hairs. Height: to 25 ft. Width: to 15 ft. Plant Character: deciduous Heat Tolerance: high Water Requirements: low Soil Requirements: alkaline Additional Comments:
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