Jepson Flora Project: Jepson Interchange    

link to manual TREATMENT FROM THE JEPSON MANUAL (1993) previous taxon | next taxon
Jepson Interchange (more information)
©Copyright 1993 by the Regents of the University of California
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Barry Prigge

Annual to shrub; hairs needle-like, stinging, or rough
Leaves alternate in CA, generally ± pinnately lobed; stipules 0
Inflorescence various
Flower bisexual, radial; sepals generally 5, generally persistent in fruit; petals generally 5, free or fused to each other or to filament tube; stamens 5–many, filaments thread-like to flat, sometimes fused at base or in clusters; petal-like staminodes sometimes present; pistil 1, ovary inferior, chamber generally 1, placentas generally 3, parietal, style 1
Fruit: generally capsule (utricle)
Seeds 1–many
Genera in family: 15 genera, ± 200 species: especially Am (Africa, Pacific)
Reference: [Ernst & Thompson 1963 J Arnold Arbor 44:138–142]


Subshrub; hairs generally rough with whorls of fine barbs
Leaf linear to ± round, entire to toothed; base tapered to cordate
Inflorescence: raceme, generally terminal; bracts 3 per flower, outer 1 > inner 2
Flower: sepals ± deciduous; petals free or claws adherent, fused below blades; stamens generally 5, free; ovary ± ovoid, placenta 1, stigma 1
Fruit: utricle, ± ovoid, generally 5-veined or -ribbed, erect
Seed 1, 1.5–2.5 mm, ± fusiform, generally smooth
Chromosomes: n=23 for all species
Species in genus: 5 species: sw US, nw Mex
Etymology: (Greek: petal claw)
Reference: [Davis & Thompson 1967 Madroño 19:1–32]


P. thurberi A. Gray

Plant < 100 cm
Leaf clasping, 4–45 mm, lanceolate to deltate-ovate, acute to acuminate, entire to few-toothed
Inflorescence 1–4 cm; outer bract 4–7.5 mm, deltate-ovate; inner bracts 2–3 mm, lanceolate to ovate, tapered to cordate, acute to ± acuminate, crenate or lobed; pedicels < 1 mm
Flower: petals 2.5–6.5 mm, cream, claws adherent, fused in upper 1/5; stamens 4–10 mm, well exserted; style 3–11 mm
Ecology: Sandy or gravelly dunes, washes, canyons in creosote-bush scrub
Elevation: < 1200 m.
Bioregional distribution: Desert
Distribution outside California: Nevada, Arizona, nw Mexico


subsp. thurberi

Hairs rough, appressed downward
Flower: stamens 6–10 mm
Ecology: Habitats and range of sp
Bioregional distribution: Desert
Flowering time: May–Jul
Horticultural information: TRY.

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bioregional map for PETALONYX%20thurberi%20subsp.%20thurberi 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 Petalonyx thurberi subsp. thurberi
Retrieve dichotomous key for Petalonyx
Overlay Consortium of California Herbaria specimen data by county on this map
Show other taxa with the same California distribution | Read about bioregions | Get lists of plants in a bioregion
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