Photo by Melody

PlantFiles: Naked Broomrape, One-flowered Cancer-root
Orobanche uniflora

Family: Orobanchaceae
Genus: Orobanche (or-oh-BAN-kee) (Info)
Species: uniflora (yoo-nee-FLOR-uh) (Info)

2 members have or want this plant for trade.

Parasites and Hemiparasites

under 6 in. (15 cm)

Unknown - Tell us

Unknown - Tell us

Sun Exposure:
Full Sun
Sun to Partial Shade
Light Shade
Partial to Full Shade
Full Shade

Unknown - Tell us

Bloom Color:
Pale Yellow
Bright Yellow
Light Blue
White/Near White

Bloom Time:
Late Winter/Early Spring
Mid Spring
Late Spring/Early Summer
Mid Summer
Late Summer/Early Fall
Mid Fall
Late Fall/Early Winter

Unknown - Tell us

Other details:
This plant may be considered a protected species; check before digging or gathering seeds

Soil pH requirements:
Unknown - Tell us

Patent Information:

Propagation Methods:
Unknown - Tell us

Seed Collecting:
Allow pods to dry on plant; break open to collect seeds
Allow seedheads to dry on plants; remove and collect seeds

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to view:

By kennedyh
Thumbnail #1 of Orobanche uniflora by kennedyh

By kennedyh
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No positives
3 neutrals
No negatives

Gardeners' Notes:

Neutral coriaceous On Feb 28, 2014, coriaceous from ROSLINDALE, MA wrote:

This native wildflower volunteers in the sunny front yard of a neighbor of mine, where his lawn meets a border filled mostly with hosta and volunteering goldenrod. There it blooms only for a couple of weeks in late spring. The flowers are lavender here. It has no visible leaves.

This parasitic species has a wide host range, including goldenrod and Helianthus. My neighbor's goldenrod appears healthy. No stonecrop or Heuchera are present.

Native to North America, this species has been found in every continental state and most of Canada. It is most commonly a woodland species, and generally absent from the Great Plains. Despite its wide geographic range, its distribution is spotty, and it is often locally rare, and in some states endangered.

It is disputed whether this species is an annual or a perennial. I have not attempted to cultivate it, but I've read that it can't be successfully transplanted.

Perhaps I'll collect seeds and place them at the base of a suitable host.

Neutral Magpye On Sep 25, 2006, Magpye from NW Qtr, AR (Zone 6a) wrote:

Stems -
Parasitic on roots of other vascular plants, herbaceous, achlorophyllous, subterranean, thin, glabrous.

Leaves -
Alternate, few, reduced to scales, whitish-tan, 2-3mm long, glabrous, ovate.

Inflorescence - Solitary flower on axillary pedicel to 15cm long. Pedicel glandular pubescent, erect.

Flower -
Corolla typically white, tubular, 2.2cm long, dense glandular pubescent, 5-lobed. Lobes to 6mm long, 4.5mm broad, with two yellow bearded strips alternating with two bottom lobes. Stamens 4, adnate at base of corolla tube, alternating with lobes. Filaments white, glabrous, to +4mm long. Anthers pale yellow, 1.1mm long. Style 7-8mm long, glabrous, tubular, expanded at apex. Stigma two lobed. Calyx tube campanulate, 5-lobed. Tube to 4mm long, 5-6mm in diameter, dense glandular pubescent. Lobes attenuate, to 5mm long, glandular pubescent.

Habitat -
Wooded slopes, rocky open woods, rocky glades, base of bluffs.

Other info -
It's a small plant but easy to find because of the fairly large white flower. The stems are short and thin and rarely seen unless you dig a bit at the base of the pedicel.

Neutral kennedyh On Jan 4, 2004, kennedyh from Churchill, Victoria
Australia (Zone 10a) wrote:

This pretty little plant has no leaves and is a root parasite on Stonecrops (Sedum sp.) and Alum-roots (Heuchera sp.)


This plant has been said to grow in the following regions:

Deer, Arkansas
Roslindale, Massachusetts
Erie, Michigan

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