Jepson Flora Project: Jepson Interchange    

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Jepson Interchange (more information)
©Copyright 1993 by the Regents of the University of California
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Elizabeth McClintock

Perennial, shrub, vine, tree, generally with milky juice, monoecious or dioecious
Leaves alternate or opposite, generally simple, evergreen or deciduous, entire to lobed, petioled; stipules sometimes ± 0
Inflorescence: raceme, spike, head, or flowers enclosed in thickened receptacle tissue, axillary
Flower unisexual, small, ± radial; sepals generally 4, free or fused at base; petals 0; stamens generally 4, opposite sepals; ovary generally superior, 1-chambered, style simple or 2-parted
Fruit: multiple achenes within fleshy calyces or surrounded by fleshy receptacle tissue
Genera in family: ± 40 genera, 900–1000 species: tropical, subtropical, some temp; many cultivated (Ficus ; Artocarpus , breadfruit, jackfruit; Morus ). Pollinated by insects or wind. See Cannabaceae for Cannabis , Humulus , sometimes included in this family.



Tree, generally with axillary thorns, dioecious
Leaves alternate but often clustered with inflorescences on short shoots, entire, deciduous; major veins pinnate
Inflorescence ± erect; staminate an umbel-like raceme, several per axil, peduncled; pistillate a dense, spheric head, 1 per axil, sessile
Pistillate flower: style simple
Fruit: multiple of achenes within fleshy calyces on inflorescence receptacle, ± like a bumpy, yellow-green orange
Species in genus: ± 12 species: warm parts of Am, Africa, Asia
Etymology: (W. McClure, American geologist, 1760–1840)


M. pomifera (Raf.) C.K. Schneid.

Tree, < 10 m; thorns 0–3 cm
Leaf: petiole 2–3 cm, slender; blade 3–12 cm, ovate to oblong-lanceolate, dark green, upper surface glabrous, lower surface soft-hairy
Fruit 8–15 cm wide, yellow-green, with hard, rough rind
Ecology: Disturbed areas, abandoned wind-breaks
Elevation: < 150 m.
Bioregional distribution: San Joaquin Valley, Western Transverse Ranges
Distribution outside California: native to s Great Plains. Widely planted; fruit inedible

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bioregional map for MACLURA%20pomifera being generated
YOU CAN HELP US make sure that our distributional information is correct and current. If you know that a plant occurs in a wild, reproducing state in a Jepson bioregion NOT highlighted on the map, please contact us with that information. Please realize that we cannot incorporate range extensions without access to a voucher specimen, which should (ultimately) be deposited in an herbarium. You can send the pressed, dried collection (with complete locality information indicated) to us (e-mail us for details) or refer us to an accessioned herbarium specimen. Non-occurrence of a plant in an indicated area is difficult to document, but we will especially value your input on those types of possible errors (see automatic conversion of distribution data to maps).

Retrieve Jepson Interchange Index to Plant Names entry for Maclura pomifera
Retrieve dichotomous key for Maclura
Overlay Consortium of California Herbaria specimen data by county on this map
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