Category: Plants

Pebble Pincusion (Chaenactis carphoclinia)

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Scientific Name: Chaenactis carphoclinia A. Gray (primarily var. carphoclinia in Death Valley and most of its range)

Pebble Pincusion (Chaenactis carphoclinia) Found near Ashford Mill, Death Valley National Park. Photo Heather Rathbun
Pebble Pincusion (Chaenactis carphoclinia) Found near Ashford Mill, Death Valley National Park. Photo Heather Rathbun

Scientific Taxonomy

  • Kingdom: Plantae
  • Clade: Tracheophytes (vascular plants)
  • Clade: Angiosperms (flowering plants)
  • Clade: Eudicots
  • Clade: Asterids
  • Order: Asterales
  • Family: Asteraceae (Sunflower or Daisy family)
  • Genus:Chaenactis (pincushions or dustymaidens)
  • Species:Chaenactis carphoclinia A. Gray

Common names include Pebble Pincushion, Pincushion Flower, and Straw-bed Pincushion. Two varieties exist: the widespread var. carphoclinia (smaller plant, common in Death Valley) and the rarer var. peirsonii (larger, limited to southern California’s Santa Rosa Mountains).

Description

Pebble Pincushion is a native annual forb/herb that grows from an erect, branching stem (usually one main stem) reaching 4–16 inches (10–40 cm) tall, occasionally up to 2 feet (60 cm) in favorable conditions. The stems are whitish-pubescent (hairy).

Leaves are green, mostly linear, and pinnately dissected or lobed (basal leaves highly divided and wither early; cauline leaves smaller with slender petioles), up to 4–10 cm long.

The inflorescence consists of 1–several small discoid flower heads (no ray flowers) per stem, each 0.25–1 cm wide. Heads feature white to pinkish-tinted disk florets with enlarged outer corollas and prominently exserted (protruding) anthers. Flat, sharp-pointed phyllaries (bracts) line the heads and often appear reddish. The fruit is a small achene tipped with a scaly pappus.

The plant resembles other desert Chaenactis species (e.g., Esteve’s Pincushion), but is generally smaller with multiple cream-to-white heads per stem.

Blooms

As a desert annual, Pebble Pincushion germinates after winter rains and blooms primarily in spring (January/February/March through May or June, depending on elevation and rainfall). In Death Valley, it is a signature species during “superbloom” years, often peaking in March–April alongside other desert annuals. The flowers are visited by bees, butterflies, and other small insects for nectar and pollen.

Range and Habitat

Pebble Pincushion is native to the southwestern United States and northwestern Mexico. Its range spans Arizona, California, Nevada, New Mexico, Utah, Baja California, and Sonora—primarily in the Mojave Desert, with extensions into the Sonoran Desert, southern Great Basin, and northwestern Chihuahuan Desert. Elevations range from 300–6,200 feet (90–1,900 m).

It thrives in rocky, gravelly, or sandy soils, including washes, open plains, mesas, slopes, and flats within desert shrublands. In Death Valley National Park, it is commonly found in gravelly washes and rocky areas (e.g., near Emigrant Pass, Badwater, and Mosaic Canyon), where it can form dense displays after sufficient winter precipitation. Seeds may be consumed by birds, small mammals, and desert tortoises.

Pebble Pincushion growing in typical Death Valley habitat—gravelly washes with mixed desert annuals under clear desert skies.

This hardy annual plays a key role in desert ecosystems as a quick-response bloomer that stabilizes soil and supports pollinators and wildlife following rainy periods.

Antelope Valley California Poppy Reserve

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Antelope Valley California Poppy Reserve
Antelope Valley California Poppy Reserve Photo by James L Rathbun.

Established in 1976, the Antelope Valley California Poppy Reserve is located just west of Mojave and boasts the most consistent blooms that the California Poppy.  The reserve does not plant or water the flowers, so the timing and abundance of the flowers is solely dependent upon rainfall each year.  The bloom season begins late winter and may last throughout the spring depending upon conditions.  In addition to the poppy, the Reserve also hosts a variety of species including Owl’s Clover, Davy Gilia, Goldfields, Lupine and Cream Cups.

The 1745 acre flower reserve ranges in elevation frim 2600 to 3000 feet in elevations and boasts 7 miles of trails.  There are limited facilities, but the reserve does have some wheel chair access.

The California Poppy the state flower of California.
The California Poppy the state flower of California. Photo by James L Rathbun.

The California Poppy ( Eschscholzia californica ) is a small perennial is typically a short flowering planet which boasts a vibrant orange bloom.  The flower itself grows on top of a sledder stalk and the four petal flower which has a silky texture, appears extremely delicate and vulnerable to the elements.  The flowers open each morning and close in the evening with the cooler air.

A Davey Gilia stalk poking up between the California Poppies. Photo by James L Rathbun.
A Davy Gilia stalk poking up between the California Poppies. Photo by James L Rathbun.

The California Poppy has a large range which included more of California, parts of Oregon, Washington, Nevada, Arizona and Northern Baja California.

Antelope Valley California Poppy Reserve Map

California Goldfields ( Lasthenia californica )

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Lasthenia californica, commonly known as California goldfields, is an annual flowering plant belonging to the family Asteraceae. It is native to California and is particularly prominent in the coastal ranges and valleys. This species is well-known for its vibrant yellow blooms that contribute significantly to the wildflower displays in California during the spring.

California Goldfields ( Lasthenia californica )
California Goldfields ( Lasthenia californica )

Taxonomy

  • Kingdom: Plantae
  • Clade: Angiosperms
  • Clade: Eudicots
  • Clade: Asterids
  • Order: Asterales
  • Family: Asteraceae
  • Genus: Lasthenia
  • Species: L. californica

Morphology

Lasthenia californica is characterized by its bright yellow, daisy-like flowers. The plant typically reaches heights of 10-50 cm. Key morphological features include:

  • Stems: Erect, slender, and often branched.
  • Leaves: Basal leaves are linear to narrowly oblanceolate, often covered with fine hairs.
  • Flowers: Inflorescences are capitula, composed of numerous yellow ray and disk florets.
  • Fruit: Achene, with each achene being topped with a pappus aiding in wind dispersal.

Habitat and Distribution

Lasthenia californica is commonly found in a variety of habitats including grasslands, coastal prairies, and open woodlands. It thrives in areas with well-drained soils and full sunlight. The plant’s distribution is largely concentrated in California, though it can also be found in parts of Oregon, Nevada, and Baja California.

Ecology

California goldfields play a significant role in their ecosystems. They provide nectar and pollen for various pollinators, including bees, butterflies, and other insects. The plant’s early blooming period helps sustain pollinator populations before other wildflowers and crops bloom.

Reproduction

Lasthenia californica reproduces sexually through seed production. The flowering period extends from February to May, during which pollination occurs primarily via insects. After pollination, seeds develop and are dispersed by wind and gravity. The seeds have a dormancy period that allows them to germinate under favorable conditions in the following year.

Conservation Status

Lasthenia californica is not currently listed as endangered or threatened. However, its habitats are often threatened by urban development, agriculture, and invasive species. Conservation efforts focus on preserving native habitats and controlling invasive species to ensure the continued survival of this and other native wildflower species.

Cultural and Economic Importance

California goldfields are valued for their aesthetic contributions to natural landscapes and wildflower displays. They are also studied for their ecological interactions and adaptability to various environmental conditions. Additionally, they are used in restoration projects aimed at re-establishing native plant communities.

Lasthenia californica is a vibrant and ecologically significant wildflower native to California. Its bright yellow blooms are a hallmark of the spring season in many regions, contributing to the biodiversity and aesthetic value of the areas they inhabit. Understanding the biology, ecology, and conservation needs of this species is essential for preserving its role in native ecosystems.

References

Creek Dogwood (Cornus sericea)

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Cornus sericea, commonly known as Redosier Dogwood, Red Twig Dogwood, or American Dogwood, is a deciduous shrub native to North America. It belongs to the family Cornaceae and is known for its striking red stems, especially visible in the winter, which provide ornamental value. This report explores the botanical characteristics, habitat, ecological significance, and uses of Cornus sericea.

Creek Dogwood (Cornus sericea)
Creek Dogwood (Cornus sericea)

Botanical Characteristics

Morphology

  • Stems and Bark – The most distinctive feature of Cornus sericea is its bright red stems, which are particularly vibrant in young twigs. The bark is smooth and can be greenish-red in younger branches, turning grayish-brown with age.
  • Leaves – The leaves are opposite, simple, and ovate to lanceolate, with a length of 5-12 cm. They have a smooth margin and are characterized by prominent venation. In the fall, the leaves turn a variety of colors including red, purple, and orange.
  • Flowers – The flowers are small, creamy-white, and arranged in flat-topped clusters called cymes. Each flower has four petals and blooms from late spring to early summer.
  • Fruit – The fruit is a small, white to bluish-white drupe, typically maturing in late summer. These drupes are an important food source for various bird species.

Growth and Reproduction

Cornus sericea can grow up to 1.5-4 meters in height and spreads through both seeds and vegetative means. It readily forms thickets by sending up new shoots from its root system. The plant prefers moist, well-drained soils but can tolerate a range of soil types including wet, clay soils.

Habitat and Distribution

Geographic Range

Cornus sericea is widespread across North America, from Alaska and Newfoundland south to New Mexico and Virginia. It thrives in a variety of habitats including wetlands, stream banks, and forest edges.

Environmental Preferences

This shrub prefers full sun to partial shade and thrives in moist, well-drained soils. It is often found in riparian zones, wetlands, and along the edges of lakes and rivers. Cornus sericea is adaptable to different soil types, including clay and sandy soils, and can tolerate seasonal flooding.

Ecological Significance

Wildlife Habitat

  • Birds – The berries of Cornus sericea are a crucial food source for many bird species, including American robins, cedar waxwings, and woodpeckers. The dense thickets provide excellent cover and nesting sites for birds.
  • Mammals – Small mammals, such as rabbits and beavers, feed on the bark and stems. The plant’s dense growth offers shelter for various small animals.

    Erosion Control

    Due to its extensive root system, Cornus sericea is effective in stabilizing soil and preventing erosion, especially along riverbanks and slopes. It is often used in riparian restoration projects for this reason.

    Uses

    Ornamental Use

    Cornus sericea is widely planted as an ornamental shrub for its vibrant red stems, which provide winter interest in gardens and landscapes. It is also used in hedges, windbreaks, and as a natural screen.

    Traditional and Medicinal Uses

    Indigenous peoples of North America have historically used Cornus sericea for various purposes. The bark and stems were used in basket weaving, and the plant had medicinal applications, such as treating colds, fevers, and diarrhea.

    Conservation and Restoration

    Due to its ability to thrive in wet environments and stabilize soil, Cornus sericea is utilized in wetland restoration and conservation projects. It helps in maintaining biodiversity and improving water quality by filtering runoff.

    Conclusion

    Cornus sericea is a versatile and ecologically significant plant with wide-ranging benefits for wildlife, soil stabilization, and ornamental use. Its adaptability to different environments and its role in supporting biodiversity make it an important species in North American flora. Conservation and utilization of this shrub can contribute to sustainable environmental management and restoration efforts.

    This report provides a comprehensive overview of Cornus sericea, highlighting its importance in various ecological and practical contexts. Further research and conservation efforts can enhance our understanding and utilization of this valuable plant species.

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    Western Wallflower (Erysimum capitatium)

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    A member of the mustard family, the Western Wallflower ( Erysimum capitatium ) is a brightly colored yellow flower which is quite common across the western United States, including Arizona, Utah and Nevada.. In European countries, the wallflower earned its name from a habit of growing on… you guess it, walls. More specifically stone, masonry or wooden fences. The name was transposed to the American species despite the fact the plants have no preference for walls.

    Western Wallflower (Erysimum capitatium)
    Western Wallflower (Erysimum capitatium)

    Scientific Taxonomy and Categorization

    • Kingdom: Plantae
    • Clades: Tracheophytes, Angiosperms, Eudicots, Rosids
    • Order: Brassicales
    • Family: Brassicaceae (mustard or cabbage family)
    • Genus: Erysimum
    • Species: Erysimum capitatum (Douglas ex Hook.) Greene (binomial name)

    The species belongs to the tribe Erysimeae within Brassicaceae. It is a dicot angiosperm (eudicot) herb. Flora of North America recognizes two main varieties: E. c. var. capitatum (often called western or sanddune wallflower) and E. c. var. purshii (Pursh’s wallflower). Numerous synonyms exist due to high morphological variability and past taxonomic confusion with E. asperum (prairie rocket). Chromosome number is 2n = 36. The plant is categorized as a biennial or short-lived perennial herb (sometimes behaving as a winter annual in southern deserts), with a taproot and variable growth form depending on elevation and habitat.

    Detailed Plant Description

    Erysimum capitatum is a highly variable, taprooted herb that produces one to several erect, leafy stems (0.5–12 dm / 1.5–12 ft tall) arising from a basal rosette. Stems are often branched distally, coarse, and covered in stiff, appressed, forked or branched (malpighiaceous/dolabriform) hairs. The plant leaks a pungent, watery juice when damaged.

    Basal leaves are simple, alternate, spatulate to narrowly oblanceolate or linear (2–27 cm long × 3–30 mm wide), with prominent midribs and margins ranging from entire to dentate or denticulate. Stem leaves are smaller, sessile, and angled upward. Leaves are typically deep green and hairy (rayed hairs vary by variety: mostly 3–7-rayed in var. capitatum; 2–3-rayed in var. purshii). Plants develop short to elongate caudices clothed in old leaf bases.

    Growth habit and life cycle show plasticity: low-elevation plants are often taller, less branched biennials and more drought-resistant; high-elevation (alpine) plants are dwarf, multi-stemmed perennials. The species is early-seral, thriving in disturbed sites, and exhibits semelparity (single reproductive event) in dry lowlands versus iteroparity (multiple events) in moist high-elevation habitats.

    Detailed Flower Description

    Flowers are perfect, arranged in congested terminal racemes that elongate in fruit. Each flower is 2.5–3.8 cm wide with four distinct, rounded petals arranged in a cross shape (typical of Brassicaceae). Petals are usually bright yellow to orange (occasionally lavender, maroon, red, white, or purple in certain populations or high elevations); var. capitatum tends toward orange-yellow, var. purshii toward yellow. Flowers have four sepals, six stamens (tetradynamous: four long, two short), a stout style (up to 3 mm), and a superior ovary. They are fragrant and bloom primarily April–August (as early as January in southern ranges or to September).

    Fruits are linear, narrow siliques (3.5–15 cm long × 1.3–3.3 mm wide), upright or nearly parallel to the stem, four-sided or slightly flattened, with prominent midveins. Each valve contains 40–80 seeds; siliques dehisce at maturity. Seeds are small, oblong (~1.5 mm), lightweight, and winged in var. capitatum. Pollination is required for full seed set; visitors include bees, flies, butterflies, and beetles.

    Habitat

    The western wallflower occupies diverse dry, open sites from valley bottoms to alpine summits. It prefers well-drained, sandy, gravelly, or rocky soils with low organic matter and fertility. Substrates include sandstone, granite, basalt, limestone, serpentine, dunes, and talus. It occurs in desert grasslands/shrublands, chaparral, pinyon-juniper woodlands, aspen groves, montane meadows, forest openings, sagebrush flats, and alpine tundra. Elevation range is sea level to 13,120 ft (4,000 m), with var. capitatum generally lower (0–5,600 ft) and var. purshii higher (3,280–13,120 ft). It tolerates full sun, drought, and disturbance (roadsides, burns, grazed areas).

    Range and Distribution

    Erysimum capitatum is one of the most widespread native North American wallflowers. Its range spans western North America from Alaska and Yukon Territory south through British Columbia, Washington, Oregon, California, Idaho, Montana, Wyoming, Utah, Colorado, Nevada, Arizona, New Mexico, and into northern Mexico (Chihuahua, Sonora, etc.). It extends eastward across the Great Plains to the Great Lakes region (Illinois, Indiana, Missouri, etc.) with scattered disjunct populations as far as Ohio and Tennessee. Var. capitatum has the broadest distribution; some California varieties (e.g., var. angustatum) are narrowly endemic and endangered. It has been introduced in parts of New England. Overall, it is considered secure (NatureServe).

    This adaptable species plays ecological roles as a nectar source for pollinators (including butterflies), larval host plant, and early colonizer of disturbed or post-fire sites. It also provides forage for wildlife such as elk, deer, bighorn sheep, and small mammals.

    Other Names

    • Coast wallflower
    • Douglas’ wallflower
    • Sanddune wallflower
    • Prairie rocket

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