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Little Sunflower - Helianthus pumilus


Global Rank: G4?
State Rank: SNR
* (see State Rank Reason below)

Agency Status
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BLM:
MNPS Threat Rank:
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State Rank Reason (see State Rank above)
Helianthus pumilus occurs in Idaho, Wyoming, and Colorado. It was reported for Montana by the Flora of the Great Plains (GPFA 1986), and was found in Big Horn County in 2007; a specimen was deposited at the Rocky Mountain Herbarium. The species remains unranked until it is better surveyed and population data can be obtained.
 
General Description
Plants: Stems are rough-hairy, simple or branched, and up to one meter tall from a tough, tap-rooted crown (McGregor et al. 1986).

Leaves: Leaves are opposite with distinct petioles, which are 0.4 to 3 centimeters long (McGregor et al. 1986; eFloras 2017). Blades are ashy green and egg- or lance-shaped with tapering bases and entire to serrate margins (McGregor et al. 1986). Dimensions are 4 to 15 centimeters long by 1 to 4 centimeters wide (McGregor et al. 1986). The leaves are stiffly hairy and dotted with glands (eFloras 2017).

Inflorescence: There are few radiate heads on short peduncles (McGregor et al. 1986). There are 15 to 25 loosely clasping involucral bracts, 3.5 to 7.5 millimeters long (eFloras 2017). Like the leaves, they have glands as well as stiff, whitish hairs (eFloras 2017).

Phenology
Flowers July to August (McGregor et al. 1986).

Range Comments
Colorado, Wyoming, and a single collection in Big Horn County, Montana (eFloras 2017).

Habitat
Found in dry, open areas with rocky soil at the base of the Rocky Mountains (eFloras 2017; McGregor et al. 1986).

Reproductive Characteristics
Flowers: The disk is yellow or sometimes reddish and 1 to 1.5 centimeters across, surrounded by about 10 yellow ray flowers. Each disk flower is subtended by an entire or three-lobed chaffy bract, which is 7 to 8 millimeters long (McGregor et al. 1986; eFloras 2017).

Fruit: Achenes are 3 to 4 millimeters long, with awn-like and triangular pappus scales that are soon deciduous (McGregor et al. 1986; eFloras 2017).

References
  • Literature Cited AboveLegend:   View Online Publication
    • eFloras. 2017. Flora of North America. Missouri Botanical Garden, St. Louis, MO & Harvard University Herbaria, Cambridge, MA.
    • Hazlett, D. 2007. Helianthus pumilus 12693. Accession number 910246. In Rocky Mountain Herbarium (RM). Laramie: University of Wyoming.
    • 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.
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Citation for data on this website:
Little Sunflower — Helianthus pumilus.  Montana Field Guide.  .  Retrieved on , from