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Seed Characteristics and Seedling Emergence of Dalmatian Toadflax

Published online by Cambridge University Press:  12 June 2017

W. C. Robocker
W. C. Robocker*
Affiliation:
Crops Research Division, Agr. Res. Serv., U. S. Dep. of Agr., Washington State University, Pullman, Washington
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Abstract

In eastern Washington Dalmatian toadflax (Linaria dalmatica (L.) Mill) produces seeds for about 3 months, beginning in early July, with over 95% produced during the first 5 weeks. A large plant will produce a half million seeds under good conditions. Seeds are sharply angular, slightly winged, and 1 to 2 mm long. Approximately 7,000 weigh 1 g. Seeds are spread by wind and browsing animals. Some seeds will germinate under laboratory conditions the same season in which produced, but germination from dry storage increases for 2 to 3 years, with a periodic low in November and a high in April. Over 90% germination is obtained with 2 to 3-year-old seeds in the laboratory. Germination in the field occurs in both spring and fall, and seedlings can emerge from a soil depth of 2 to 2.5 cm.

Type
Research Article
Information
Weed Science , Volume 18 , Issue 6 , November 1970 , pp. 720 - 725
Copyright
Copyright © Weed Science Society of America 

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References

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