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Slender Indian Paintbrush - Castilleja gracillima
Other Names:  Castilleja miniata ssp. miniata

Species of Concern

Global Rank: G3G4
State Rank: S2
* (see State Rank Reason below)

Agency Status
USFWS:
USFS:
BLM:
MNPS Threat Rank:
C-value: 7

External Links






State Rank Reason (see State Rank above)
This plant is a regional endemic, known in Montana from a limited number of populations, with most being relatively small. No threats have been observed, though it could be vulnerable to hydrologic alterations or noxious weeds.
 
General Description
Slender Indian Paintbrush is a perennial with slender, erect or ascending, usually unbranched stems, 20-50 cm tall, that often root at the base. The entire-margined leaves are narrowly lance-shaped, and the foliage is glabrous or covered with long, soft hairs. The inflorescence is generally yellow, but may be orange or even red. The oblong flower bracts are entire-margined or may have a single pair of small lobes near the top. The calyx is 15-22 mm long and deeply divided into two lobes at the top that are each divided again into two smaller, pointed lobes. The petals of the flower are united into a tube below that forms a large, galea and three small lobes or teeth opposite it. The entire corolla is 20-30 mm long; the galea is densely hairy and less than half as long as the tube, while the lip is green and ca. 1/5 the length of the galea.

Phenology
Flowering occurs from June to August.

Diagnostic Characteristics
Castilleja sulphurea and C. miniata are also perennial species of paintbrush that occur in mid-elevation wetland and riparian habitats. However, both have clumped stems arising from a branched rootcrown and are not rhizomatous.

Dorn (1988, Vascular Plants of Wyoming) considers C. gracillima to be simply a rhizomatous form of C. miniata. Plants similar to C. gracillima occur in southern B.C. and Glacier National Park, Montana (=C. amplifolia) but are referred to C. miniata (Hitchcock et al., 1959, Vascular Plants of the Pacific Northwest, Vol.4).

Species Range
Present
 


Range Comments
Northwestern WY and adjacent MT to central ID; most BC occurrences are in the Kootenai River Valley contiguous with nothern ID and northwestern MT, yet the species is not present in these sectors of the adjoining states, a peculiarly disjunct distribution that might call for closer taxonomic review.

Summary of Observations Submitted for Montana
Number of Observations: 38

(Click on the following maps and charts to see full sized version) Map Help and Descriptions
Relative Density

Recency

 

(Observations spanning multiple months or years are excluded from time charts)



Habitat
Castilleja gracillima occurs on saturated soils along willow-dominated stream courses in sagebrush-grassland settings (Vanderhorst and Heidel 1995). In the Gallatin National Forest, it has been found in wet meadows with at least seasonally saturated soils, along streambanks and on gentle sloping spring terraces (Matthews (1989). Associates include Castilleja minata (scarlet paintbrush), Geranium richardsonii (white geranium), Salix wolfii (Wolf's willow), Epilobium glaberrimum (smooth willow-herb), Habenaria dilatata (white bog-orchid), and Habenaria hyperborea (northern green bog-orchid).

Ecological Systems Associated with this Species

Ecology
Species of the genus Castilleja are typically hemiparasites, capable of growing with or without deriving supplemental nutrition from a host plant. They are generally pollinated by hummingbirds and insects, and produce many seeds that are very light and easily airborne (Matthews 1989). Species of Castilleja are subject to herbivory by noctuid larvae, however, slender Indian paintbrush was not observed to be as heavily fed upon as many other species.

Matthews reported populations in the Gallatin National Forest as apparently stable. However, they may be subject to natural disturbance regimes, since cycles of disturbance and re-establishment occur at relatively frequent intervals in the stream and river bank habitats where this species grows.

Management
Recreational fishing is the primary activity where this plant grows in the Gallatin National Forest, and is not thought to affect it (Mathews 1989). Livestock grazing takes place in these drainages, however population monitoring would be needed to detect any impacts.

References
  • Additional ReferencesLegend:   View Online Publication
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    • Dorn, R.D. 1988. Vascular Plants of Wyoming. Mountain West Publ., Cheyenne.
    • Hitchcock, C. L., A. Cronquist, M. Ownbey and J. W. Thompson. 1959. Vascular plants of the Pacific Northwest, Part 4. Ericaceae through Campanulaceae. University of Washington Press, Seattle and London. 510 pp.
    • Lesica, P., M. T. Lavin, and P. F. Stickney. 2012. Manual of Montana Vascular Plants. Fort Worth, TX: BRIT Press. viii + 771 p.
    • Mathews, S.Y. 1989. Sensitive plant surveys, 1989: U.S. Forest Service, Region 1, Gallatin National Forest, Montana. Unpublished report to the USDA Forest Service, Gallatin National Forest, Bozeman, Montana. Montana Natural Heritage Program, Helena, MT. 85 pp.
    • Vanderhorst, J.P. and B.L. Heidel. 1995. Sensitive plant survey in the Tobacco Root Mountains, Madison County, Montana. Unpublished report to the Beaverhead and Deerlodge National Forests. Montana Natural Heritage Program. Helena, MT. 66 pp. plus appendices.
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Citation for data on this website:
Slender Indian Paintbrush — Castilleja gracillima.  Montana Field Guide.  .  Retrieved on , from