Flora of North America species comparison

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Ostrya knowltonii

ironwood, Knowlton's hop-hornbeam, western hop-hornbeam
Habit Trees, to 9 m; crowns open, narrowly rounded.
Bark

brownish gray, broken into narrow vertical scales or rather ragged strips.
Twigs

sparsely to moderately pubescent, often with stipitate glands.
Leaves

blade ovate or broadly ovate-elliptic to broadly elliptic or nearly orbiculate, 2.5–6.5 × 1.5–5 cm, base narrowly rounded to cordate or cuneate, margins sharply and unevenly doubly serrate, apex acute;

surfaces abaxially pubescent, especially on veins.
Inflorescences

staminate catkins 2–3 cm; pistillate catkins 0.6–1 cm.
Infructescences

2.5–4 × 1.8–2.5 cm;

bracts 1–1.8 × 0.5–1 cm.

Ostrya knowltonii
Phenology Flowering late spring.
Habitat Streamsides and rocky slopes in moist canyons
Elevation 1200–2400 m (3900–7900 ft)
Distribution
from FNA
AZ; NM; TX; UT
[WildflowerSearch map]
[BONAP county map]
Discussion

Ostrya knowltonii occurs sporadically throughout the arid Southwest, including both rims of the Grand Canyon. On the basis of morphology and phytogeography, it appears to be more closely allied with Ostrya in mountainous western Mexico than with the eastern O. virginiana.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 3.
Parent taxa Betulaceae > subfam. Coryloideae > Ostrya
Sibling taxa
O. chisosensis, O. virginiana
Synonyms O. baileyi
Name authority Coville: Gard. & Forest 7: 114. (1894)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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