Jepson eFlora: Taxon page
Vascular Plants of California
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Petalonyx thurberi subsp. gilmanii

Higher Taxonomy
Family: LoasaceaeView DescriptionDichotomous Key
Habit: Annual to subshrub; hairs needle-like, barbed, occasionally stinging. Leaf: alternate [opposite], generally +- pinnate-lobed; stipules 0. Inflorescence: cyme, raceme. Flower: bisexual, radial; sepals generally 5, generally persistent; petals generally 5, free or fused to each other or filament tube; stamens 5--many, filaments thread-like to flat, occasionally fused at base or in clusters; petal-like staminodes occasionally present; pistil 1, ovary inferior, chamber generally 1, placentas generally 3, parietal, style 1. Fruit: capsule or achene. Seed: 1--many.
Genera In Family: 18+ genera, 250 species: especially America (Africa, Pacific).
eFlora Treatment Author: Larry Hufford & Barry Prigge, except as noted
Scientific Editor: Douglas H. Goldman, Bruce G. Baldwin.
Genus: PetalonyxView DescriptionDichotomous Key

Habit: Subshrub; hairs barbed. 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: achene, +- ovoid, generally 5-veined or -ribbed, erect. Seed: 1, 1.5--2.5 mm, +- fusiform, generally smooth. Chromosomes: 2n=46.
Etymology: (Greek: petal claw)
eFlora Treatment Author: Larry Hufford & Barry Prigge
Reference: Davis & Thompson 1967 Madroño 19:1--32
Species: Petalonyx thurberiView Description 

Habit: 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 well exserted; style 3--11 mm.

Petalonyx thurberi A. Gray subsp. gilmanii (Munz) W.S. Davis & H.J. Thomps.
Habit: Hairs soft, spreading. Flower: stamens 4--7.5 mm.
Ecology: Sandy washes, dunes; Elevation: < 1200 m. Bioregional Distribution: n DMoj. Flowering Time: May--Jun, Sep--Nov
Unabridged Synonyms: Petalonyx gilmanii Munz
Jepson eFlora Author: Larry Hufford & Barry Prigge
Reference: Davis & Thompson 1967 Madroño 19:1--32
Index of California Plant Names (ICPN; linked via the Jepson Online Interchange)
Listed on CNPS Rare Plant Inventory

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Citation for this treatment: Larry Hufford & Barry Prigge 2012, Petalonyx thurberi subsp. gilmanii, in Jepson Flora Project (eds.) Jepson eFlora,, accessed on March 05, 2024.

Citation for the whole project: Jepson Flora Project (eds.) 2024, Jepson eFlora,, accessed on March 05, 2024.

No expert verified images found for Petalonyx thurberi subsp. gilmanii.

Geographic subdivisions for Petalonyx thurberi subsp. gilmanii:
n DMoj.
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map of distribution 1
(Note: any qualifiers in the taxon distribution description, such as 'northern', 'southern', 'adjacent' etc., are not reflected in the map above, and in some cases indication of a taxon in a subdivision is based on a single collection or author-verified occurence).


Data provided by the participants of the  Consortium of California Herbaria.
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All markers link to CCH specimen records. The original determination is shown in the popup window.
Blue markers indicate specimens that map to one of the expected Jepson geographic subdivisions (see left map). Purple markers indicate specimens collected from a garden, greenhouse, or other non-wild location.
Yellow markers indicate records that may provide evidence for eFlora range revision or may have georeferencing or identification issues.

CCH collections by month

Duplicates counted once; synonyms included.
Species do not include records of infraspecific taxa, if there are more than 1 infraspecific taxon in CA.
Blue line denotes eFlora flowering time (fruiting time in some monocot genera).