Tag: Sonoran

The Sonoran Desert, spanning parts of Arizona, California, Mexico, and a small section of Baja California, is a vibrant and ecologically rich arid landscape. Characterized by its stunning variety of cacti, including the iconic saguaro, this desert is known for its diverse flora and fauna adapted to extreme heat and aridity. The terrain features rolling sand dunes, rugged mountains, and expansive valleys, while seasonal rains bring bursts of life, transforming the desert into a colorful spectacle of blooming wildflowers. Despite its harsh conditions, the Sonoran Desert supports a wide array of wildlife, from resilient reptiles and mammals to numerous bird species, showcasing a unique and delicate ecosystem thriving in one of North America’s most striking environments.

Mojave-aster ( Xylorhiza tortifolia )

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Mojave-aster ( Xylorhiza tortifolia )
Mojave-aster ( Xylorhiza tortifolia )

A member of the sunflower family, the Mojave-aster ( Xylorhiza tortifolia ) boasts a delicate lavender flower in the harsh desert environment. Also known as the Mojave Woodyaster, the plant commonly reaches about 30 inches in height. The green-grey colored stems hold a solitary flower which is about two inches in diameter. The plant gathers sun with three inch long silver-green leaves and an individual plant may offer dozens to purple hued flowers.

A solitary Mojave Aster next to a wind blown Globe Mallow bush.
A solitary Mojave Aster next to a wind blown Globemallow bush.

The Mojave Aster typically blooms between March and May, and again in October when the monsoon season allows. It in commonly found between 2000 and 3500 feet in elevation, however in California it is know to thrive between 700 and 6500 feet. The flowers of this plant are attractive to bees, butterflies and birds.

The aster is known to grown in the Great Basin and Sonora deserts and thrives in the Mojave. Like many other desert adapted plants, this plant thrives in sandy dry, well drained soil and common on desert slopes and washes.

The Havasupai people used this plant and its flowers as a fragrence to mask body odors and as an incense. Dried leaves where commonly carried in clothes by the tribal members.

Speckled Rattlesnake ( Crotalus mitchellii )

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The Speckled Rattlesnake is fairly common pit viper found in southern California, southern Nevada, western Arizona and south-western Utah and down the Pacific coast into Baja California.  A moderate size snake, this animal typically does not exceed 39 inches in length.  As with most animals, the Speckled Rattlesnake is a master of disguise and commonly are colored to compliment the surrounding rock.  This viper can range from pink, cream, tan or pale blues and grays.  This feature I can personally attest to as I witnessed and entire Cub Scout Pack literally step over the specimen photographed below while hiking on a camping trip in the Valley of Fire State Park just outside of Las Vegas, Nevada.

Juvenile Speckled Rattle Snake found in Valley of Fire State Park, Nevada
A Juvenile Speckled Rattlesnake found in Valley of Fire State Park, Nevada
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Desert Marigolds (Baileya multiradiata)

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Desert Marigolds located off the Old Mojave Road.
Desert Marigolds photographed near the Old Mojave Road.

Biological Report: Desert Marigold

Scientific Taxonomy

  • Kingdom: Plantae
  • Clade: Tracheophytes
  • Clade: Angiosperms
  • Clade: Eudicots
  • Clade: Asterids
  • Order: Asterales
  • Family: Asteraceae (Aster or Sunflower family)
  • Genus: Baileya
  • Species: Baileya multiradiata Harv. & A. Gray ex A. Gray

Common names include desert marigold, showy desert marigold, paper daisy, desert baileya, and hierba amarilla. Synonyms include Baileya australis, Baileya multiradiata var. nudicaulis, Baileya multiradiata var. thurberi, and Baileya thurberi. The genus is named after American botanist Jacob Whitman Bailey; “multiradiata” refers to the many-rayed flower heads.

Description

Desert marigold is a native, sun-loving biennial or short-lived perennial forb/herb that typically grows 12–18 inches (30–52 cm) tall and spreads 4–12 inches (10–30 cm) wide, forming attractive mound-shaped clumps. The basal leaves are grayish-green, woolly (covered in soft white hairs that help retain moisture), pinnately lobed to entire, and clustered at the base (4–10 cm long). The stems are mostly leafless and branched in the lower half. Flower heads are solitary, daisy-like composites borne on long, naked stalks (10–32 cm). Each head measures about 1.5–2 inches (4–5 cm) across with 25–50 bright yellow ray florets (the “petals”) surrounding a central disk of 25–50+ yellow disk florets. As the flowers age, the rays fade and become papery, giving rise to the common name “paper daisy.” The plant is adapted to arid conditions and is distinguished from similar species like woolly desert marigold (Baileya pleniradiata) by its taller stature, longer bloom period, and greater abundance.

Blooms

The showy, bright-yellow composite flower heads bloom intermittently from March (or April) through November, and can continue year-round in favorable conditions with adequate moisture. Flowering is sporadic but prolific, often triggered by rainfall, producing impressive mounds of nearly solid yellow. The long-lasting blooms turn papery and persist on the plant as they age. This extended blooming period makes it one of the most reliable and conspicuous desert wildflowers.

Range and Distribution

Desert marigold is native to the Mojave, Sonoran, and Chihuahuan deserts of the southwestern United States and northern Mexico. In the U.S., it occurs in Arizona, California, Nevada, New Mexico, Texas, and Utah (primarily at lower to mid-elevations). In Mexico, it extends into states including Sonora, Chihuahua, Coahuila, Durango, and Aguascalientes. It grows on sandy or gravelly (often alkaline) soils in washes, roadsides, rocky slopes, sandy plains, mesas, and semidesert grasslands, from near sea level up to about 5,000–6,500 ft (100–1,981 m). It thrives in full sun and well-drained soils across desert ecosystems.

This hardy, drought-tolerant wildflower is an iconic component of southwestern desert landscapes, valued for its cheerful blooms and adaptability.

This yellow wild flower is also known as:

  • Desert Marigold
  • Showy Desert Marigold
  • Paper Daisy
  • Desert Baileya

Desert Primrose (Oenothera deltoides)

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Desert Primrose photographed in Anza Burego, CA
Desert Primrose photographed in Anza Burego, CA

Classification (Taxonomy)

Oenothera deltoides belongs to the evening primrose family and is classified as follows (using a combination of traditional Linnaean ranks and modern phylogenetic clades):

  • Kingdom: Plantae
  • Clade: Tracheophytes (vascular plants)
  • Clade: Angiosperms (flowering plants)
  • Clade: Eudicots
  • Clade: Rosids
  • Order: Myrtales
  • Family: Onagraceae Juss. (Evening Primrose family)
  • Genus: Oenothera L.
  • Species: Oenothera deltoides Torr. & Frém. (described in 1845 by John Torrey and John C. Frémont)

The species includes several subspecies (e.g., O. d. subsp. howellii, which is federally endangered in California, and others such as subsp. deltoides, subsp. piperi, subsp. ambigua, subsp. cognata, and subsp. julpunensis). The overall species is considered secure.

Description

Oenothera deltoides, commonly known as the Desert Primrose, is a bushy or mounded annual (sometimes short-lived perennial) herb in the Evening Primrose family. It typically grows 2–18 inches (5–46 cm) tall but can reach up to 3 feet (about 1 m) in favorable conditions, with a spread up to 40 inches (1 m) wide. The plant often forms a dense basal rosette with a central erect stem and several decumbent to ascending leafy branches. The herbage is grayish-green to pale green and may be hairy or glandular.

Leaves: Primarily basal and sparse along the stems; deltoid (triangular) to obovate or oblanceolate in shape, up to 4 inches (10 cm) long. Margins are often toothed, lobed, grooved, or cleft, giving a distinctive triangular appearance (reflected in the species epithet deltoides).

Flowers: Large, showy, and fragrant, measuring 1.5–3 inches (4–8 cm) wide with four white petals forming a saucer or cup shape (sometimes turning yellowish toward the center). They open in the early evening (around sunset) and close by mid-morning, a classic evening-primrose trait. The flowers are solitary in the upper leaf axils and fade to pinkish with age. They are pollinated primarily by nocturnal moths (such as the white-lined sphinx moth) and native bees.

Fruit: A woody capsule that persists after flowering.

Distinctive Feature: After the plant dies (typically after setting seed), the stems curl upward and inward, forming a hollow, cage- or basket-like structure. This gives rise to many of its common names and allows the dried plant to tumble in the wind, dispersing seeds.

The plant is highly adapted to arid conditions and often carpets sandy desert floors with white “tissue-paper-like” blooms following abundant winter rains.

Range and Distribution

Oenothera deltoides is native to the Southwestern United States and northern Mexico. Its range includes the Mojave and Colorado Deserts, extending into parts of the Great Basin and coastal sandy areas. It occurs in the following U.S. states: Arizona (AZ), California (CA), Nevada (NV), Oregon (OR), and Utah (UT). In Mexico, it is found in northern Baja California and northwestern regions.

Habitat: Dry, open sandy soils, dunes, desert washes, rocky cliffs, hillsides, and occasionally beaches or coastal dunes. Elevations are generally below 2,500–5,500 feet (760–1,680 m), depending on the region. It thrives in full sun and is most abundant in the Mojave, Sonoran, and adjacent desert regions after wet winters.

Flowering season is primarily January–May (varying slightly by location and rainfall), with peak blooms often in February–April.

List of Other Common Names

In addition to Desert Primrose (or Dune Primrose), the species is known by many evocative names that reference its flowers, fragrance, or post-death “cage” structure:

  • Birdcage evening primrose
  • Basket evening primrose
  • Birdcage primrose
  • Dune evening primrose
  • Lion in a cage (or Lion-in-a-cage)
  • Devil’s lantern (or Desert lantern)
  • Fragrant primrose
  • Desert evening-primrose
  • Hairy evening primrose (occasional reference)

These names vary regionally but consistently highlight the plant’s striking appearance and unique dried form.

Oenothera deltoides is a beautiful and ecologically important desert wildflower, providing nectar for pollinators and contributing to the spectacular spring displays of the American Southwest. It is widely available for native plant gardening in arid regions and requires well-drained sandy soil with minimal irrigation once established.