Jepson Flora Project: Jepson Interchange    

 
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Jepson Interchange (more information)
©Copyright 1993 by the Regents of the University of California
For up-to-date information about California vascular plants, visit the Jepson eFlora.

MALVACEAE

MALLOW FAMILY

Steven R. Hill, except as specified

Annual, perennial herb, shrubs, trees, generally stellate-hairy; juice sticky; inner bark tough, fibrous
Leaves alternate, simple, petioled; blade generally palmately veined or lobed, stipules present
Inflorescence often leafy; whorl or involucre of bractlets often subtending calyx
Flower generally bisexual, radial; calyx lobes 5, margins abutting in bud; petals 5, free (fused at base to filament tube, so falling together); stamens many, filaments fused into a tube surrounding style, tube fused in turn to petal bases; pistil 1, ovary superior, chambers generally 5 or more, style branches, stigmas generally 1 or 2 X as many as chambers
Fruit of 5–many disk- or wedge-shaped segments, loculicidal capsule, or berry
Genera in family: 100 genera, 2000 species: worldwide, especially warm regions; some cultivated (e.g., Abelmoschus , okra; Alcea ; Gossypium , cotton; Hibiscus , Malvaviscus )
Recent taxonomic note: Recently treated to include Sterculiaceae [Angiosperm phylogeny Group 1998 Ann Missouri Bot Gard 85:531–553; Alverson et al. 1999 Amer J Bot 86:1474–1486; Bayer et al. 1999 Bot J Linn Soc 129:267–303]
Mature fruit important for identification.

HORSFORDIA

Subshrub, densely stellate-tomentose or -scabrous
Stem erect
Leaf: petiole stout; blade lanceolate to round, cordate, ± entire or irregularly fine-toothed
Inflorescence: panicle or flowers solitary in axils; bractlets subtending calyx 0
Flower: petals yellow-orange to red-lavender; stigmas head-like
Fruit: segments 8–12, upper portion dehiscent, with 2 spreading, scarious wings; lower portion seed-bearing, indehiscent, firm, net-veined
Seeds 1–3, white-puberulent
Species in genus: 4 species: sw US, Mex
Etymology: (F.H. Horsford, Vermont, botanical collector)
Reference: [Fryxell 1985 Syst Bot 10:268–272]

Native

H. newberryi (S. Watson) A. Gray


Stem erect, 10–30 dm, branched above base; hairs velvety, yellow to rusty, stellate
Leaf: blade 3–15 cm, shallowly cordate, entire to crenate
Flower: pedicels 5–10 mm in flower, < 20 mm in fruit; calyx lobes 2–3 mm, ± triangular, acute; petals 8–10 mm, yellow or pale orange
Fruit: segments 8–9, ± 6 mm; wings ovate, ± = lower part
Seeds 2–3 per segment
Ecology: Uncommon. Creosote-bush scrub
Elevation: 100–800 m.
Bioregional distribution: Peninsular Ranges, w Sonoran Desert
Distribution outside California: to sw Arizona, n Mexico
Flowering time: Mar–Apr, Nov–Dec
See the CNPS Inventory for information about endangerment and rarity.
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bioregional map for HORSFORDIA%20newberryi 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 Horsfordia newberryi
Retrieve dichotomous key for Horsfordia
Overlay Consortium of California Herbaria specimen data by county on this map
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