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Calochortus ambiguus - (M.E. Jones) Ownbey

Common Name Arizona or Doubting Mariposa Lily
Family Liliaceae
USDA hardiness 6-9
Known Hazards Edible when cooked; raw bulbs may cause mild stomach upset due to saponins. Avoid collecting in protected habitats.
Habitats Typically found between 1,000 and 2,000 m elevation on dry slopes, mesas, and desert grasslands. Often associated with Agave, Yucca, and Bouteloua species in open habitats.
Range Native to Arizona, New Mexico, and northern Mexico.
Edibility Rating    (4 of 5)
Other Uses    (2 of 5)
Weed Potential No
Medicinal Rating    (0 of 5)
Care (info)
Fully Hardy Well drained soil Moist Soil Full sun
Calochortus ambiguus Arizona or Doubting Mariposa Lily


Bill Bouton from San Luis Obispo, CA, USA Attribution-Share Alike 2.0
Calochortus ambiguus Arizona or Doubting Mariposa Lily
Bill Bouton from San Luis Obispo, CA, USA Attribution-Share Alike 2.0

 

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Summary

The Arizona or Doubting Mariposa Lily is a delicate, drought-tolerant perennial native to the desert grasslands and foothills of the southwestern United States, particularly Arizona and New Mexico. Emerging from a small bulb, this lily produces striking, tulip-like flowers in spring—white to pale lavender with darker veins and a conspicuous nectar gland at each petal’s base. Although all Calochortus species have edible bulbs, many are protected or rare; collection should be avoided in conservation areas. The bulbs were a traditional food source among Indigenous peoples and early settlers.


Physical Characteristics

 icon of manicon of bulb
Calochortus ambiguus is a BULB growing to 0.2 m (0ft 8in) by 0.1 m (0ft 4in) at a medium rate.
See above for USDA hardiness. It is hardy to UK zone 7. The flowers are pollinated by Bees, Insects.
It is noted for attracting wildlife.
Suitable for: light (sandy) and medium (loamy) soils, prefers well-drained soil and can grow in nutritionally poor soil. Suitable pH: neutral and basic (mildly alkaline) soils and can grow in very alkaline soils.
It cannot grow in the shade. It prefers dry or moist soil and can tolerate drought.

UK Hardiness Map US Hardiness Map

Synonyms

Homotypic Synonyms: C. watsonii var. ambiguus M.E.Jones

Plant Habitats

Edible Uses

The bulbs are edible when cooked, offering a mild, potato-like flavor and soft texture. The bulbs were roasted or boiled by Native American peoples, notably the Apache and Hopi. Because of their small size, collecting enough bulbs for a meal is labor-intensive, but they are rich in starch and energy. The edibility rating is 4/5 for the bulb and 1/5 for other plant parts, which are minimal and of low nutritional value [2-3]. Taste, Processing & Kitchen Notes: Fresh bulbs are crisp and faintly sweet. When roasted or boiled, they develop a smooth, floury texture similar to parsnips or new potatoes. A light roasting or ash baking brings out a subtle nutty aroma. The bulbs lack bitterness or onion-like flavor, distinguishing them from many other bulbous plants. Indigenous cooking methods included roasting in earth ovens or boiling in clay pots [2-3]. Seasonality (Phenology): Flowering: April–June, depending on elevation and moisture. Fruiting: May–July. Dormancy: Plants die back completely by midsummer, leaving no above-ground trace until the following spring. Bulb harvest: Best conducted immediately after flowering or once seed capsules mature. Safety & Cautions (Food Use): Edible when cooked; raw bulbs may cause mild stomach upset due to saponins. Avoid collecting in protected habitats. Harvest & Processing Workflow: Dig bulbs carefully during or just after flowering using a narrow trowel. Rinse, peel outer tunic, and roast or boil 15–20 minutes. Drying or roasting for storage is possible but reduces flavor. Traditional / Indigenous Use Summary: Consumed as a starchy emergency food by southwestern tribes such as the Apache, Hopi, and Zuni. Bulbs were eaten roasted, boiled, or ground into flour. The plant also held ceremonial value, with flowers occasionally used as offerings.

References   More on Edible Uses

Medicinal Uses

Plants For A Future can not take any responsibility for any adverse effects from the use of plants. Always seek advice from a professional before using a plant medicinally.


None Known

References   More on Medicinal Uses

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Other Uses

Xeric native gardens and wildflower restorations. Traditional / Indigenous Use Summary: The plant also held ceremonial value, with flowers occasionally used as offerings. Ecology & Wildlife: Supports native bee pollinators and small beetles. The flowers’ nectar glands provide early-season resources in desert ecosystems. Bulbs may be consumed by rodents, including ground squirrels and pocket gophers. A beautiful and ecologically resilient desert bulb with a long cultural history as a wild food. It exemplifies adaptation to drought and nutrient-poor soils while producing edible bulbs.

Special Uses

References   More on Other Uses

Cultivation details

Identification & Habit: A small herbaceous perennial, Calochortus ambiguus arises from an ovoid bulb 1–2 cm in diameter. Stems are slender, 10–40 cm tall, usually unbranched, and bear one to three grass-like leaves. Flowers are cup-shaped with three broad petals and three narrower sepals, the petals displaying a whitish-pink to lavender hue with darker markings and a distinctive central nectar gland. The interior may be spotted or fringed. Fruits are erect, three-angled capsules that dry to a tan color. Pollination is primarily by native solitary bees (Anthophoridae, Andrenidae) and occasionally small butterflies and beetles, which are attracted by the conspicuous coloration and sugary secretions of the petal glands. Growing Conditions: Prefers well-drained sandy or gravelly soils in open grasslands, pinyon-juniper woodlands, and desert foothills. It thrives in full sun, tolerates alkaline conditions, and survives extended summer drought via dormancy. USDA Hardiness Zones: 6–9. Habitat & Range: Native to Arizona, New Mexico, and northern Mexico, typically found between 1,000 and 2,000 m elevation on dry slopes, mesas, and desert grasslands. Often associated with Agave, Yucca, and Bouteloua species in open habitats. Size & Landscape Performance: Height ranges 10–40 cm, width 10–15 cm. The plant’s fine, grassy foliage and elegant flowers make it desirable for xeric native gardens and wildflower restorations. In cultivation, it benefits from rocky mulch and deep, dry summer dormancy. Cultivation (Horticulture): Requires dry summers and moderate winter moisture; well-suited to rock gardens. Fertilization should be avoided, as rich soils diminish bulb hardiness. Pests & Problems: Generally pest-free. In cultivation, bulbs may rot in poorly drained soils. Fungal blight occasionally affects leaves under humid conditions.

References   Carbon Farming Information and Carbon Sequestration Information

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Plant Propagation

Best from seed sown in fall; bulbs may be divided after dormancy.

Other Names

If available other names are mentioned here

Arizona or Doubting Mariposa Lily (Calochortus ambiguus (M.E. Jones) Ownbey)

Native Range

US. USA. Arizona, Mexico Northwest, New Mexico, Utah

Weed Potential

Right plant wrong place. We are currently updating this section. Please note that a plant may be invasive in one area but may not in your area so it's worth checking.

None. Calochortus ambiguus is not aggressive and tends to decline in disturbed areas.

Conservation Status

IUCN Red List of Threatened Plants Status : Not available

Related Plants
Latin NameCommon NameHabitHeightHardinessGrowthSoilShadeMoistureEdibleMedicinalOther
Calochortus aureusMariposa Lily, Golden mariposa lilyBulb0.3 3-7  LMNDM402
Calochortus barbatus Bulb0.6 3-7  LMNDM10 
Calochortus clavatusClubhair mariposa lily, Arroyo de la Cruz mariposa lilyBulb1.0 8-10 MLMNDM10 
Calochortus elegansStar Tulip, Elegant mariposa lilyBulb0.2 3-7  LMNDM10 
Calochortus flexuosusWinding Mariposa LilyBulb0.3 5-8 MLMNDM402
Calochortus gunnisoniiMariposa Lily, Gunnison's mariposa lilyBulb0.3 4-8  LMNDM412
Calochortus kennedyiKennedy’s or Desert Mariposa LilyBulb0.3 6-9 MLMNDM402
Calochortus luteusYellow Mariposa, Yellow mariposa lilyBulb0.3 3-7  LMNDM20 
Calochortus macrocarpusSagebrush Mariposa Lily, Nez Perce mariposa lilyBulb0.5 3-7  LMNDM21 
Calochortus nuttalliiSego LilyBulb0.2 3-7  LMNDM502
Calochortus pulchellusMount Diablo Globelily, Mt. diablo fairy-lanternBulb0.3 3-7  LMSNDM20 
Calochortus tolmieiTolmie StartulipBulb0.3 3-7  LMSNDM20 
Calochortus uniflorusLarge-Flowered Star Tulip, Monterey mariposa lilyBulb0.3 3-7  LMNDM10 
Calochortus venustusButterfly Mariposa LilyBulb0.6 3-7  LMNDM20 

Growth: S = slow M = medium F = fast. Soil: L = light (sandy) M = medium H = heavy (clay). pH: A = acid N = neutral B = basic (alkaline). Shade: F = full shade S = semi-shade N = no shade. Moisture: D = dry M = Moist We = wet Wa = water.

 

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Author

(M.E. Jones) Ownbey

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