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Mentzelia affinis - Greene

Common Name Yellowcomet Blazingstar
Family Loasaceae
USDA hardiness 8-11
Known Hazards The seeds of yellowcomet blazingstar have a documented history of traditional food use. However, correct identification is essential, particularly because some members of the Mentzelia genus are known to accumulate selenium.
Habitats Associated with creosote bush scrub communities, which are characteristic of the Mojave and Sonoran deserts. The plant grows in open desert landscapes, including sandy and gravelly plains, washes, and other dry habitats.
Range California to Arizona and Mexico (Baja California, Sonora).
Edibility Rating    (3 of 5)
Other Uses    (2 of 5)
Weed Potential No
Medicinal Rating    (0 of 5)
Care (info)
Half Hardy Well drained soil Moist Soil Full sun
Mentzelia affinis Yellowcomet Blazingstar


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Mentzelia affinis Yellowcomet Blazingstar
Copyright © 1995-2026 UC Regents. All rights reserved.

 

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Summary

Yellowcomet blazingstar is a small annual wildflower native to the deserts of the southwestern United States, particularly southern California, southern Nevada, and Arizona. It belongs to the Mentzelia genus, a group of plants commonly known as blazingstars or stickleafs because of their attractive flowers and rough, adhesive foliage. The plant produces bright yellow flowers followed by seed capsules containing numerous small seeds. These seeds were traditionally harvested by the Kawaiisu people of southern California and used as a seasonal food resource. Yellowcomet blazingstar is well adapted to hot, dry desert environments and is particularly associated with creosote bush (Larrea tridentata) communities. Although its seeds are edible, their small size makes gathering and processing relatively time-consuming. Like other blazingstars, the plant has rough hairs that can cling to clothing and skin. It is primarily valued for its seeds, attractive flowers, and contribution to desert biodiversity.


Physical Characteristics

 icon of manicon of flower
Mentzelia affinis is a ANNUAL growing to 0.5 m (1ft 8in) by 0.3 m (1ft) at a fast rate.
See above for USDA hardiness. It is hardy to UK zone 9. It is in flower from February to May. 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: mildly acid, neutral and basic (mildly 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

Acrolasia affinis (Greene) Rydb.

Plant Habitats

Edible Uses

Yellowcomet blazingstar is an interesting native desert wildflower with a documented history of use as food by the Kawaiisu people of southern California. People can gather its small seeds and process them into meal, porridge, or seed butter, although the supplied field notes do not include a direct assessment of their flavor or preparation. The plant is well adapted to the harsh conditions of the Mojave and Sonoran deserts, particularly creosote bush communities. Its main limitations as a food resource are the small seed size, the effort required to gather and process them, and the difficulty of distinguishing similar Mentzelia species. It also has ecological value, particularly as a native annual wildflower that contributes to seasonal desert biodiversity. With an edibility rating of 3 out of 5, yellowcomet blazingstar is a moderately useful traditional seed food, although other blazingstar species may offer larger or more easily processed seed harvests [2-3]. Native American communities, particularly the Kawaiisu people of southern California, traditionally gathered the seeds. People can grind the seeds into meal and prepare them as porridge or process them into seed butter, as documented for edible members of the Mentzelia genus. Individual seeds are small, approximately 1–2 mm wide, but each capsule contains numerous seeds, and a single plant can produce several capsules. Although several Mentzelia species produce edible seeds, the genus also includes species known to accumulate selenium. Correct identification is therefore important [2-3]. Edibility Rating: 3 out of 5 – Moderately useful edible plant. Yellowcomet blazingstar produces edible seeds that were traditionally harvested as food. Its numerous seed capsules make it a potentially useful seasonal resource, although the small seeds require considerable gathering and processing effort [2-3]. Taste and Preparation: The Kawaiisu people traditionally collected and processed yellowcomet blazingstar seeds for food. The seeds can be ground into meal and used to prepare porridge or seed butter, following the general methods documented for edible blazingstars. Blazingstar seeds vary considerably in size, shape, and texture. Some species have relatively large, easily gathered seeds, while others produce smaller seeds that require more careful processing. Yellowcomet blazingstar seeds are about 1–2 mm wide, prism-shaped, and relatively smooth. Seed capsules should be allowed to mature and dry before harvesting. Once dry, separate the seeds from the capsules and clean them to remove fragments of plant material. The seeds may then be ground into meal for cooking. Because we did not directly sample this species, detailed preparation methods specific to yellowcomet blazingstar remain uncertain [2-3]. Seasonality: Yellowcomet blazingstar flowers primarily from February to May, depending on rainfall and local growing conditions. Seeds generally mature from April to July, making late spring and early summer the principal harvesting period. In desert environments, flowering timing and abundance can vary considerably from year to year. Following favorable winter rainfall, plants may grow vigorously and produce numerous flowers and seed capsules. During drought years, populations may be sparse or fail to develop. The best time to gather seeds is when the capsules have dried, and the seeds are fully mature. Traditional Uses: The Kawaiisu people of southern California traditionally harvested yellowcomet blazingstar seeds as a seasonal food. Blazingstar seeds were among the many small-seeded wild plants gathered by Indigenous communities throughout the American Southwest and Great Basin. Indigenous communities processed the seeds of various Mentzelia species into foods such as porridge, flour, seed butter, and other preparations. Other blazingstars, particularly whitestem blazingstar (Mentzelia albicaulis), were important traditional foods in some regions. Yellowcomet blazingstar illustrates how desert communities used small, seasonal seed resources that might otherwise seem insignificant [2-3]. Safety: Yellowcomet blazingstar seeds have a documented history of traditional food use. However, correct identification is essential, especially because some Mentzelia species are known to accumulate selenium. Ten-petal blazingstar (Mentzelia decapetala), for example, has been identified as a selenium-accumulating species. This does not establish that Mentzelia affinis accumulates dangerous concentrations of selenium, but it shows why edible uses should not automatically transfer between species. We do not have toxicological testing or a detailed nutritional analysis of yellowcomet blazingstar seeds. Avoid gathering plants from contaminated soils, roadsides, mining areas, or locations where pesticides or herbicides may have been applied. The rough hairs covering the leaves and stems can cling to skin and clothing and may cause mechanical irritation. Only correctly identified, mature, clean seeds should be considered for food use [2-3].

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.


No documented or scientifically validated medical uses specifically for Mentzelia affinis. A few broader species within the Mentzelia genus have documented ethnobotanical and historical folk remedies; Mentzelia affinis was historically utilized as a food source rather than a medicine.

References   More on Medicinal Uses

Other Uses

Yellowcomet blazingstar is best suited to dryland gardens, native plant collections, and desert restoration projects within its natural climatic range. Yellowcomet blazingstar contributes to desert biodiversity by providing flowers for native pollinating insects. Like other members of the Mentzelia genus, its flowers contain numerous stamens and can provide pollen for visiting insects. The seeds may also provide food for seed-eating animals, although specific wildlife relationships for this species are not documented in the supplied source. As a native annual wildflower, it contributes to the seasonal plant diversity of creosote bush communities. Its flowers are particularly valuable during favourable spring growing seasons when desert annuals produce short-lived displays of colour.

Special Uses

References   More on Other Uses

Cultivation details

Yellowcomet blazingstar grows best in full sun and well-drained sandy, gravelly, or rocky soils. It is adapted to arid desert conditions and can establish in relatively poor soils where many other plants struggle to survive. The species depends on seasonal rainfall to germinate and grow. Winter and early spring moisture is particularly important because it allows the plant to complete much of its life cycle before the extreme heat and drought of summer. It generally performs best in open habitats with limited competition from taller vegetation. Heavy, persistently wet soils are unsuitable. Habitat: low rainfall, intense sunlight, and considerable seasonal temperature variation closely follow Yellowcomet blazingstar occurs in the deserts of the southwestern United States, particularly from southern California through southern Nevada to southeastern Arizona. It is associated with creosote bush scrub communities, which are characteristic of the Mojave and Sonoran deserts. The plant grows in open desert landscapes, including sandy and gravelly plains, washes, and other dry habitats. It is adapted to environments with low rainfall, intense sunlight, and considerable seasonal variation in temperature. Its distribution is closely associated with suitable desert soils and the availability of seasonal moisture. USDA Hardiness Zones: USDA Zones 8–11 (approximate). Yellowcomet blazingstar is a desert annual, so its successful growth depends more on seasonal rainfall and germination conditions than on winter hardiness alone. Seeds may survive unfavorable soil conditions and germinate when moisture and temperatures become suitable. These zones are an ecological estimate rather than a verified horticultural hardiness range for the species. Growth Rate: Fast during favorable growing conditions. Yellowcomet blazingstar is an annual plant that germinates, grows, flowers, and produces seeds within a single growing season. Growth is strongly influenced by rainfall. Following adequate winter moisture, plants can develop rapidly and begin flowering in late winter or early spring. During drought years, growth may be greatly reduced. Mature Size: Yellowcomet blazingstar is a relatively small annual herb. Approximate height: 10–50 cm (4–20 inches). Plant size varies with rainfall, soil conditions, and growing-season temperatures. This is an approximate range for the species and should be verified against a regional botanical description before being used as a definitive measurement. Cultivation: Yellowcomet blazingstar is best suited to dryland gardens, native plant collections, and desert restoration projects within its natural climatic range. It requires full sun, excellent drainage, and relatively low soil fertility. The plant is adapted to seasonal moisture rather than year-round irrigation. In cultivation, autumn or winter sowing may help reproduce the natural growing cycle experienced in southwestern desert habitats. Because the species is an annual, successful cultivation depends on allowing plants to flower and produce mature seeds. Its bright yellow flowers may make it an attractive addition to native desert wildflower plantings. However, cultivation information specific to Mentzelia affinis is limited, and seed germination requirements may vary. Identification: Yellowcomet blazingstar is a small annual herb belonging to the Loasaceae family. Like other blazingstars, it has simple, alternate leaves with rough surfaces covered in specialized hairs. These hairs can cling to clothing and skin, giving members of the genus their alternative common name, stickleaf. The leaves are generally narrow and may have toothed or lobed margins. The flowers are yellow and have the characteristic Mentzelia structure, with five petals and numerous stamens. The flowers develop into capsules containing multiple seeds. Seed Identification: The seeds provide some of the most important distinguishing characteristics. Yellowcomet blazingstar seeds are approximately 1–2 mm wide. They are prism-shaped, with grooves along their angles. The seed surfaces are relatively flat and smooth. These features help distinguish the species from other blazingstars whose seeds may be winged, lens-shaped, strongly ridged, or covered with bumps. Seed examination is particularly important because many Mentzelia species have very similar flowers and foliage. Similar Species Yellowcomet blazingstar resembles several other Mentzelia species found throughout the southwestern United States. Whitestem blazingstar (Mentzelia albicaulis) is widespread, and its seeds were an important traditional food. Its grain-shaped seeds have irregular angles, depressions, or ridges, and surfaces covered with pointed bumps. These differ from the relatively smooth, prism-shaped seeds of yellowcomet blazingstar. Bushy blazingstar (Mentzelia dispersa) is particularly similar in seed structure. Its seeds are approximately 0.7–1.7 mm long, prism-shaped, and relatively smooth, often with shiny surfaces. Distinguishing these species may require careful examination of the seeds, flowers, and other botanical characteristics. Veatch's blazingstar (Mentzelia veatchiana) also produces edible seeds, but they are grain-shaped, irregularly angled, and bumpy. Whitebract blazingstar (Mentzelia involucrata) occurs in some of the same desert regions. Its seeds are grain-shaped, wrinkled, and yellowish-brown, often with pale coatings. Identifying blazingstars can be challenging because flowers and mature seeds are not always present at the same time. Botanists may need to examine flowering plants and return later to collect mature seeds before confirming an identification.

References   Carbon Farming Information and Carbon Sequestration Information

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Plant Propagation

Yellowcomet blazingstar reproduces by seed. Seeds develop inside capsules that mature during late spring and early summer. Propagation is likely to be most successful when sowing conditions resemble the species' natural desert environment, particularly the seasonal moisture and temperature patterns that follow winter rainfall. Seeds should be sown in well-drained sandy or gravelly soil.

Other Names

If available other names are mentioned here

Yellowcomet blazingstar, yellow comet blazingstar, yellowcomet stickleaf, yellow blazing star

Native Range

US. USA. Arizona, California, Mexico Northwest.

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.

Low. Yellowcomet blazingstar is a native desert annual and is not generally recognised as an invasive weed. It is adapted to relatively specialised dryland habitats and depends on suitable seasonal rainfall for successful reproduction. Although it may produce numerous seeds under favourable conditions, this is a normal characteristic of desert annual wildflowers rather than evidence of invasive behaviour. Outside its native range, its ability to establish and spread is uncertain.

Conservation Status

IUCN Red List of Threatened Plants Status : Not listed.

IUCN Red List

Related Plants
Latin NameCommon NameHabitHeightHardinessGrowthSoilShadeMoistureEdibleMedicinalOther
Mentzelia albicaulisWhitestem Blazing StarAnnual0.3 4-10 FLMNDM412
Mentzelia congestaUnited BlazingstarAnnual0.4 5-9 FLMNDM302
Mentzelia dispersaBushy BlazingstarAnnual0.4 4-9 FLMNDM302
Mentzelia involucrataWhitebract BlazingstarAnnual0.3 9-11 FLMNDM502
Mentzelia laevicaulisSmoothstem BlazingstarPerennial0.9 4-9 MLMNDM302
Mentzelia multifloraManyflowered Mentzelia, Adonis blazingstarPerennial0.0 0-0  LMHNDM21 
Mentzelia pumilaDwarf MentzeliaPerennial0.0 -  LMHNDM21 

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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