North America Native Plant

Howell’s Phacelia

Botanical name: Howellanthus

USDA symbol: HOWEL3

Life cycle: perennial

Habit: forb

Native status: Native to the lower 48 states  

Howell’s Phacelia: California’s Mysterious Native Wildflower Meet Howellanthus, better known as Howell’s phacelia – a plant so elusive that even seasoned botanists might scratch their heads when you mention it. This California native is one of those fascinating botanical mysteries that reminds us just how much we still have to ...

Howell’s Phacelia: California’s Mysterious Native Wildflower

Meet Howellanthus, better known as Howell’s phacelia – a plant so elusive that even seasoned botanists might scratch their heads when you mention it. This California native is one of those fascinating botanical mysteries that reminds us just how much we still have to discover in our own backyards.

What Makes Howell’s Phacelia Special?

Howell’s phacelia is a perennial forb, which simply means it’s an herbaceous flowering plant that comes back year after year without developing woody stems like shrubs or trees. As a member of the native flora, this plant has been quietly calling California home for far longer than any of us have been around.

The plant belongs to what botanists call the dicot group – plants that start life with two seed leaves rather than one. But beyond these basic facts, Howell’s phacelia remains something of an enigma in the plant world.

Where Does It Call Home?

This native beauty is found exclusively in California, making it a true Golden State endemic. However, its exact distribution within the state remains poorly documented, which adds to its mysterious reputation.

The Rarity Factor

Here’s where things get interesting – and concerning. The lack of readily available information about Howell’s phacelia suggests it may be quite rare. When a native plant is this poorly documented, it often means one of two things: either it’s extremely limited in its natural range, or it’s been overlooked by researchers due to remote habitat or subtle characteristics.

If you’re thinking about adding this plant to your garden, pump the brakes for a moment. Rare native plants require special consideration, and we always recommend sourcing any rare species only from reputable native plant nurseries that use responsibly collected seeds or ethically propagated material.

Growing Conditions and Care

Unfortunately, specific growing requirements for Howell’s phacelia aren’t well established in horticultural literature. As a California native perennial, it likely prefers:

  • Mediterranean-type climate conditions
  • Well-draining soil
  • Minimal summer water once established
  • Full sun to partial shade

However, without more detailed cultivation information, growing this plant successfully would require some educated guesswork based on other California natives with similar characteristics.

Wildlife and Pollinator Benefits

While specific data on Howell’s phacelia’s wildlife benefits isn’t available, plants in the phacelia family are typically excellent pollinator magnets. Native bees, butterflies, and other beneficial insects often rely heavily on these types of native wildflowers for nectar and pollen.

Should You Plant Howell’s Phacelia?

Here’s our honest take: unless you’re a specialist in rare California natives or working with conservation organizations, you might want to consider other well-documented native alternatives. The lack of cultivation information makes this a challenging plant for typical home gardeners.

Instead, consider these proven California native alternatives that offer similar benefits:

  • Common phacelia (Phacelia tanacetifolia)
  • Wild heliotrope (Phacelia minor)
  • Caterpillar phacelia (Phacelia cicutaria)

The Bottom Line

Howell’s phacelia represents the fascinating diversity of California’s native flora, even if we don’t know much about it yet. Its rarity makes it more of a conservation priority than a garden plant, and that’s perfectly okay. Sometimes the best way to appreciate a rare native is to support habitat protection and leave it thriving in its natural home.

If you do encounter this plant in the wild, consider yourself lucky – and please observe from a distance. Every rare native plant deserves our respect and protection, even the mysterious ones we’re still learning about.

Howell’s Phacelia

Classification

Group

Dicot

Kingdom

Plantae - Plants

Subkingdom

Tracheobionta - Vascular plants

Superdivision

Spermatophyta - Seed plants

Division

Magnoliophyta - Flowering plants

Subdivision
Class

Magnoliopsida - Dicotyledons

Subclass

Asteridae

Order

Solanales

Family

Hydrophyllaceae R. Br. - Waterleaf family

Genus

Howellanthus (Constance) Walden & R. Patt. - Howell's phacelia

Species

Plant data source: USDA, NRCS 2025. The PLANTS Database. https://plants.usda.gov,. 2/25/2025. National Plant Data Team, Greensboro, NC USA