Shaggy Dwarf Morning-glory - Evolvulus nuttallianus
(see State Rank Reason below)
MNPS Threat Rank
State Rank Reason (see State Rank above)
Evolvulus nuttallianus is fairly common in south-central and south-east Montana, but appears to be undercollected in herbarium and database records.
Plants: Evolvulus nuttallianus
is a woody-based perennial herb, 7 to 20 centimeters tall and densely covered with brownish or grayish hairs (Lesica et al. 2012; McGregor et al. 1986). Stems are erect or ascending (McGregor et al. 1986).
Leaves: Leaves are alternate and densely covered with hairs, like the stems. They are narrowly lance-shaped or inversely lance-shaped and 8 to 15 centimeters long, with short or absent petioles (Lesica et al. 2012; McGregor et al. 1986).
Inflorescence: The flowers are borne singly in the leaf axils along the length of the stem, upon a 1 to 4 millimeter peduncle with two small bracts at the base (McGregor et al. 1986; Lesica et al. 2012)(Contribution of Lesica et al. adapted from Lesica, P., M. Lavin, and P. Stickney. 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX)
Flowers May to July (McGregor et al. 1986).
MT, SD south to AZ, TX and TN (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).
Observations in Montana Natural Heritage Program Database
Number of Observations:
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(Observations spanning multiple months or years are excluded from time charts)
In a Colorado study, 3 species of grasshoppers fed on Evolvulus nuttallianus out of 14 grasshoppers studied (Ueckert et al. 1972). This plant made up 10% of the diet of Melanoplus foedus and 1% of the diets of M. angustipennis and M. confusus. Dicot plants comprised over 60% of the diet for these three grasshoppers and less than 20% of the diet for all others studied, which ate primarily grasses.
Bison (Bos bison) were been documented grazing E. nuttallianus in a Colorado experiment, though grasses made up the majority of their diet (Peden et al. 1974).
Flowers: The sepals are narrowly lance-shaped, quite hairy, and 3 to 5 millimeters long (McGregor et al. 1986; Lesica et al. 2012). They surround the light lavender corolla, which forms a 4 to 7 millimeter long tube (Lesica et al. 2012). The anthers are 1 to 2 millimeters long, upon filaments that are twice as long (McGregor et al. 1986).
Fruit: The fruit is an egg-shaped capsule without hairs, similar in length to the sepals. Inside are two (sometimes one) smooth brown seeds (McGregor et al. 1986).(Contribution of Lesica et al. adapted from Lesica, P., M. Lavin, and P. Stickney. 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX)
- Literature Cited AboveLegend: View Online Publication
- Lesica, P., M. T. Lavin, and P. F. Stickney. 2012. Manual of Montana Vascular Plants. Fort Worth, TX: BRIT Press. viii + 771 p.
- McGregor, R.L., coordinator, and T.M. Barkley, R.E. Brooks, and E.K. Schofield, eds.: Great Plains Flora Association. 1986. Flora of the Great Plains. Lawrence, KS: Univ. Press Kansas. 1392 pp.
- Peden, D.G., G.M. Van Dyne, R.W. Rice, and R.M. Hansen. 1974. The trophic ecology of Bison bison l. on shortgrass plains. Journal Applied Ecology 11:489-498.
- Ueckert, D., Hansen, R., and C. Terwilliger, Jr. 1972. Influence of Plant Frequency and Certain Morphological Variations on Diets of Rangeland Grasshoppers. Journal of Range Management 25(1): 61-65.