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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  • Up-to-date information about California vascular plants is available from the Jepson eFlora.

LOASACEAE

LOASA FAMILY

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]

PETALONYX

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]

Native

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

Native

subsp. thurberi

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

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