Plant Species: Agoseris heterophylla, annual agoseris
Kingdom: Plantae
Phylum: Magnoliophyta -- flowering plants
Class: Magnoliopsida -- dicots
Family: Asteraceae -- sunflower
Genus: Agoseris
Species: heterophylla
Variety: The Palouse phase is var. heterophylla.
Common Name: annual agoseris
Species Code: AGHE2
Origin: Native to dry open places in western North America from British Columbia east to Montana and south to New Mexico.
Rare: no
Form: forb, annual, scapose, fibrous rooted, 7-40 cm tall.
Duration: annual
Longevity: annual
Habitat Type: prairie
Wetland Indicator Status: Not on list.
Leaves: Leaves are mostly basal, oblanceolate, and may be toothed, pinnatifid or entire, 4-20 cm long
Mature height: 4-16 inches
Flowers: yellow, all ligulate and perfect (Hitchcock et al 1969), opening in the morning and closing up before noon.
Flower color: yellow
Bloom: May, June
Bloom starts on: May
Bloom ends on: June
Fruit: ribbed achene, 3-4 mm long, tapering to a slender beak and terminating with a barbellate pappus.
Vegetation type:
Characteristics:
Reproduces sexually by seed.
Taprooted.
2n=18, 36 (Baldwin et al 2004).
Apomixis may occur in the genus.
Diploids and tetraploids occur.
Seeds are windborne.
Comments:
Sun requirement: full
Soil moisture: dry to mesic
Precipitation:
Fire:
Hazards:
Sowing time: fall
Transplant time: not recommended
Stratification: 30 days cold moist stratification
Seed yield: low
Seed harvest: begins in late June
Seed first harvest: same year
Seed cleaning: Removal of the pappus and beak cause some difficulty.
Planting duration: annual
Seed insect problem: none noted
Seed shatter: high
Seed size: medium
Seed harvest date: begins in late June
Seed comments: Seed maturity is indeterminate and seed must be harvested frequently.
Herbaria:
Key words:
Alternate Genus:
Alternate Species:
Alternate Variety:
Pullman Washington Plant Materials Center
Notes:
References:
Baldwin, B.G., S. Boyd, B.J. Ertter, D.J. Keil, R.W. Patterson, T.J. Rosatti, and D.H. Wilken (eds). 2004. Jepson Online Interchange for California Floristics. University and Jepson Herbaria, University of California, Berkeley, CA. Online at http://ucjeps.berkeley.edu/interchange.html Accessed 7/12/09.
Hitchcock, C. Leo, Arthur Cronquist, Marion Ownbey, and J.W. Thompson. 1969. Vascular Plants of the Pacific Northwest. University of Washington Press. Seattle, WA. Vol. 5, Compositae.
Price, H. James and Konrad Bachman. 1975. DNA Content and Evolution in the
Microseridinae. American Journal of Botany 62:262-267.