The bracted twistflower
Austin's vanishing wildflower
Going, going, ....? |
Natural history
Life cycle: Seeds germinate in the fall. Plants grow as rosettes (see picture at right above) during the winter. They flower in April or May, sending up flowering stalks 1-4 ft tall with 4-petaled flowers. In the summer, the seeds in long pods ripen and then the adult plants die. Seeds can remain dormant in the soil for years. |
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Habitat: Rocky hillsides and slopes. It is usually found growing under shrubs, but it may not need shade; its present association with shrubs might be because deer have eaten the plants in the open. |
The situation now
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Why is the bracted twistflower vanishing from Austin?
Development: The bracted twistflower only lives on some of the hillsides and hilltops on the western side of the city - where people like to live, too. Houses now occupy sites where it used to live. |
Deer: Deer think it's tasty - and there are many more deer now than there used to be. |
???: There are probably additional reasons for its rarity. Suspicion currently rests on recent increases in cedar density. The bracted twistflower may have some special soil requirements, too. |