Jepson eFlora
Key to families | Table of families and genera

Key to Ulmus

View taxon page for Ulmus

Jepson Manual glossary definitions can be seen by moving your cursor over words underlined with dots.

1. Leaf 1–3.5 cm wide, obtuse, acute, or short-acuminate, margin simply or occasionally doubly serrate

2. Bark not furrowed, peeling as irregular woody scales 2–8 cm wide, orange-brown where freshly exposed, soon weathering ash-gray; flowers, fruit in autumn ..... U. parvifolia

2' Bark deeply furrowed, remaining firmly attached, medium gray; flowers, fruit appearing before leaves in spring ..... U. pumila

1' Leaf 3.5–8.3 cm wide, acuminate, margin doubly serrate

3. Pedicel 7–17 mm, slender; flower, fruit drooping; fruit wing margin densely ciliate; bark split into ridges that mostly curve together at their ends; branches never with corky outgrowths ..... [U. americana]

3' Flower, fruit sessile or nearly so; fruit including wings glabrous except for pubescence on stigmatic surface in notch; bark split into ridges or plates that seldom curve together; generally some branches with corky warts or wings ..... [U. minor]


Citation for the whole project: Jepson Flora Project (eds.) [year] Jepson eFlora, [accessed on month, day, year]
Citation for an individual treatment: [Author of taxon treatment] [year]. [Taxon name] in Jepson Flora Project (eds.) Jepson eFlora, [URL for treatment]. Accessed on [month, day, year].
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