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Phenology of Chrysothamnus viscidiflorus subspecies viscidiflorus (Hook.) Nutt.

  • James A. Young (a1) and Raymond A. Evans (a1)

Abstract

The configuration of the growth pattern for Chrysothamnus viscidiflorus (Hook.) Nutt. was determined from vegetative bud burst to flowering. Important portions of the pattern are: restrictive growth during early spring, accelerated growth in late spring when the optimum susceptibility to herbicides occurs, and a leveling off of growth before flowering. Seedlings and young plants have a more rapid and greater annual stem elongation than mature or senescent plants. Elongation during the accelerated growth period can be predicted from early spring growth with moderate precision when soil moisture and temperatures are not limiting. Populations growing on sites of higher or lower elevations or of pronounced aspect will have growth patterns moderately varying from the modal populations. The greatest factor influencing the growth pattern on years with adequate soil moisture was competition from other species and the combination of competition and age of the rabbitbrush plants.

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1. Evans, R.A., Young, J.A., and Eckert, R.E. Jr. 1969. Herbaceous weed control and revegetation of semi-arid rangelands in the western United States. Outlook on Agr. 6:6066.
2. Evans, R.A., Holbo, H.R., Eckert, R.E. Jr., and Young, J.A. 1970. Functional environment of downy brome communities in relation to weed control and revegetation. Weed Sci. 18:154162.
3. Hyder, D.N., Sneva, F.A., Chilcote, D.O., and Furtick, W.R. 1958. Chemical control of rabbitbrush with emphasis upon simultaneous control of big sagebrush. Weeds 6:289297.
4. Hyder, D.N., Sneva, F.A., and Freed, V.H. 1962. Susceptibility of big sagebrush and green rabbitbrush to 2,4-D as related to certain environmental, phenological, and physiological conditions. Weeds 10:288295.
5. McKell, C.M. and Chilcote, W.W. 1957. Response of rabbitbrush following removal of competing vegetation. J. Range Manage. 10:228230.
6. Mooney, H.A. and Billings, W.D. 1960. The annual carbohydrate cycle of alpine plants as related to growth. Amer. J. Bot. 47:594598.
7. Robertson, J.H. and Cords, H.P. 1957. Survival of rabbitbrush, Chrysothamnus Spp., following chemical, burning, and mechanical treatments. J. Range Manage. 10:8389.
8. Strickler, G.S.S. 1956. Factors affecting the growth of whitesage (Eurotia lanata (Pursh) Moq.). Masters Thesis. University of Nevada, Reno, Nevada. 123 pp.
9. Tueller, P.T. and Evans, R.A. 1969. Control of green rabbitbrush and big sagebrush with 2,4-D and picloram. Weed Sci. 17:233235.
10. Young, J.A. and Evans, R.A. 1974. Population dynamics of green rabbitbrush in disturbed big sage brush communities. J. Range Manage. 27:127132.

Phenology of Chrysothamnus viscidiflorus subspecies viscidiflorus (Hook.) Nutt.

  • James A. Young (a1) and Raymond A. Evans (a1)

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