Bracted Twistflower - Center For Plant Conservation
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Plant Profile

Bracted Twistflower (Streptanthus bracteatus)

This is a shot of the pink-flowering plant. Photo Credit: San Antonio Botanical Garden
  • Global Rank: G1 - Critically Imperiled
  • Legal Status: N/A
  • Family: Brassicaceae
  • State: TX
  • Nature Serve ID: 161715
  • Date Inducted in National Collection: 02/09/1992

This beautiful plant is found in Texas Hill country. Once scattered throughout south-central Texas, this species is now thought to be rare, and has been considered for federal status. The Bracted twistflower is an herbaceous, somewhat succulent waxy annual. It produces beautiful lavender-purple flowers from spring to early summer. Its name is derived from the fact that, located at the bottom of each flower stalk, is a tiny bract. This unique feature distinguishes the species from others in the genus. Indigeneous people and european settlers utilized related species as a food source. (Damude and Poole 1990).

Where is Bracted Twistflower (Streptanthus bracteatus) located in the wild?


Found in a number of varied habitats on thin clay soils in the semi-arid to mesic woodland habitat of the Balcones Canyonlands region of the Edwards Plateau. Proximity appears to be one of the few strict requirements for the species. Most of the known populations occur in Texas Hill Country. (Damude and Poole 1990)


Balcones Escarpment in the Edwards Plateau of south central Texas (Damude and Poole 1990)

States & Provinces:

Bracted Twistflower can be found in Texas

Which CPC Partners conserve Bracted Twistflower (Streptanthus bracteatus)?

CPC's Plant Sponsorship Program provides long term stewardship of rare plants in our National Collection. We are so grateful for all our donors who have made the Plant Sponsorship Program so successful. We are in the process of acknowledging all our wonderful plant sponsorship donors on our website. This is a work in progress and will be updated regularly.

Conservation Actions

Nature Serve Biotics
  • 05/02/2017

Endemic to south-central Texas, with many of the occurrences in rapidly developing urban areas. Several sites have been extirpated by housing developments. Browsing pressure has increased due to the introduction of domestic and exotic animals as well as an overabundance of white-tail deer, particularly in urban areas.

Cindy Barrett
  • 01/01/2010

Deer browse Residential development Habitat alteration by fire suppression (Damude and Poole 1990)

Cindy Barrett
  • 01/01/2010

Current population trends are unknown. In 1990 there were eight known sites containing 14 population clusters with 3 to over 500 plants per population. (Damude and Poole 1990)

Cindy Barrett
  • 01/01/2010

David Benjamin Zippin, a graduate student at the University of Texas at Austin, studied herbivory and the population biology of this species (Zippin 1997).

Cindy Barrett
  • 01/01/2010

Monitoring and surveys Response to disturbance


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Taxon Streptanthus bracteatus
Authority A. Gray
Family Brassicaceae
CPC Number 4137
ITIS 23343
Common Names bracted twistflower | bracted jewelflower
Associated Scientific Names Streptanthus bracteatus
Distribution Balcones Escarpment in the Edwards Plateau of south central Texas (Damude and Poole 1990)
State Rank
State State Rank
Texas S1S2
Ecological Relationships

Plants growing in open areas are eaten by deer and/or rabbits (Damude and Poole 1990). It is likely that pollinators are required for successful reproduction. Only one species of bee (Magachile comata) has been observed on flowers that may be capable of pollinating this species. (Dieringer 1991)

Common Name Name in Text Association Type Source InteractionID
Leaf-cutting bees Megachile comata Not Specified Link
Sweat bees Dialictus Not Specified Link
Leaf-cutting bees Megachile Not Specified Link
Bee flies Bombyliidae Not Specified Link
Syrphid flies Syrphidae Not Specified Link

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