Life history

Species overview

Clustered Broomrape (Orobanche fasciculata), a State Threatened plant, is found in dry prairies and dunes (both near Lake Michigan and inland). Blooming occurs throughout June; fruiting occurs throughout July. The optimal identification period for this species is throughout June.

Synonyms: Anoplanthus fasciculatus, Phelypaea lutea, Thalesia fasciculata, Thalesia lutea, Orobanche fasciculata var. franciscana, Orobanche fasciculata var. lutea

Identification

• Distinguishing characteristics: 4 to 10 pedicels, slightly if at all longer than the stem.
• Flower characteristics: Loose, flat-topped corymb that surpasses the stem; bractlets absent; corolla 1.5 to 3 cm; calyx lobes about equal to the tube.
• Fruit characteristics:
• Leaf characteristics: Reduced to scales, ovate, hairy, all or at least the upper with an abrupt, sharp point.

Phenology

• Blooming phenology: throughout June
• Fruiting phenology: throughout July
• Optimum time to identify: throughout June

Other

• Growth form: Forb-erect
• Vegetative reproduction:
• Life cycle: Annual
• Comments: Associated Species: Ammophila breviligulata, Artemisia campestris, Cirsium pitcheri. Root-parasite herb.

State status

Status and Natural Heritage Inventory documented occurrences in Wisconsin

The table below provides information about the protected status - state and federal - and the rank (S and G Ranks) for Clustered Broomrape (Orobanche fasciculata). See the Working List Key for more information about abbreviations. Counties shaded blue have documented occurrences for this species in the Wisconsin Natural Heritage Inventory database. The map is provided as a general reference of where this species has been found to date and is not meant as a range map.

Habitats and landscapes

The Natural Heritage Inventory has developed scores indicating the degree to which each of Wisconsin's rare plant species is associated with a particular natural community or ecological landscape. This information is similar to that found in the Wildlife Action Plan for animals. As this is a work in progress, we welcome your suggestions and feedback.

General habitat information

• Habitat description: Found in dry prairies and dunes (both near Lake Michigan and inland).
• Soils: Dry, sandy soils.

Natural communities

This table lists the natural communities that are associated with Clustered Broomrape. Scores for natural community associations are: "significant" association (score=3), "moderate association" (score=2) or the species can be present but is only weakly associated with the community (score=1).

Ecological landscapes

This table lists the ecological landscape association scores for Clustered Broomrape. The scores (3=High, 2=Moderate, 1=Low, 0=None) also correspond to the map.

Species guidance

The Endangered Resources Program has developed avoidance measures and management guidelines for plants on the Natural Heritage Working List. These are a work in progress, and we welcome your suggestions and feedback. Sources used in developing this information can be found here.

Avoidance measures

These are specific actions designed to avoid "take" (mortality) of this species.

• Avoid known individual plant locations and conduct operations elsewhere when they are least likely to cause damage. Ideally, this would involve frozen, snow-covered ground. However, in areas of the state where frozen conditions are unreliable, very dry soils late in the growing season might be the best available alternative. Consult with a biologist, if needed.
• Avoid broadcast spraying of herbicides; use care with spot spraying.

Management guidance

Management guidelines are additional considerations that may help maintain or enhance habitat for this species

• Avoid disturbance to shorelines and the forest-beach interface.
• Prescribed burns and/or brushing may be beneficial (dependent on local site conditions).
• Maintain and restore open habitat through selective clearing and brushing.

Other resources

Links to additional Clustered Broomrape information

• Grassland and Savanna Protocols
• Michigan Natural Features Inventory [exit DNR]
• NatureServe Explorer information [exit DNR]

Other links related to vascular plants (all exit the DNR website)

• Wisconsin Vascular Plants
• Freckmann Herbarium
• Atlas of Wisconsin Prairie and Savanna Flora - Wisconsin State Herbarium
• USDA - NRCS Plants Database
• USGS Midwestern Wetland Flora - field office guide to plant species
• eFloras
• Cofrin Center for Biodiversity Herbarium
• Intermountain Herbarium Grasses of North America
• Orchids of Wisconsin

Photos

Click to view a larger version. Please considering donating a photo to the Endangered Resources Program for educational uses. Photo use