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(Last Modified On 1/17/2013)
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(Last Modified On 1/17/2013)
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Family
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ULMACEAE
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Contributor
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LORIN I. NEVLING, JR.
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Description
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Bisexual, monoecious or dioecious shrubs or trees, sap watery. Leaves simple, mostly alternate but sometimes opposite, often distichous, often inequilateral; petiolate; stipules lateral or interpetiolar, caducous. Inflorescences solitary, cymose or in axillary fascicles, borne on previous or current year's growth. Flowers bisexual or unisexual by abortion, anemophilous, obscurely zygomorphic; sepals 4-8, free or basally connate; petals 0; stamens generally equal to or twice, rarely more than twice, as many as the sepals, erect in bud, the anthers 2-celled, dehiscing longitudinally; pistil 1, rudimentary in staminate flowers, in pistillate and bisexual flowers the ovary superior, sessile or stipitate, 2-carpellate, I-locular or rarely 2- locular, the ovule 1, anatropous, pendulous from locule apex, the styles 2, free or fused at the base, linear, stigmatose on upper inner surface; fruit a more or less winged samara with straight embryo and flat cotyledons or a drupe with curved embryo and rolled or folded cotyledons.
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Habit
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shrub tree
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Distribution
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A widely distributed family of approximately 15 genera and more than 160 species.
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Key
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a. Fruit more or less samaroid, dry; seed flat; embryo straight with gen- erally flat cotyledons, exendospermous ....................................................... 1. ULMUS aa. Fruit drupaceous; seed round; embryo curved with folded or rolled cotyledons; endosperm sometimes present. b. Leaves opposite; stipules interpetiolar ........................... 2. LOZANELLA bb. Leaves alternate; stipules lateral. c. Stamens as many as the sepals. d. Pistillate flowers in lax, many-flowered cymes; plants unarmed. 3. TREMA dd. Pistillate flowers solitary or few; plants often armed ................... 4. CELTIS cc. Stamens at least twice as many as the sepals ....................... 5. AMPELOCERA
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