pale agoseris

(Agoseris glauca var. glauca)

Conservation Status
pale agoseris
  IUCN Red List

not listed


N5? - Secure

SNR - Unranked


not listed

Wetland Indicator Status
  Great Plains

FACU - Facultative upland


FACU - Facultative upland

  Northcentral & Northeast

FACU - Facultative upland


Pale agoseris is a common, erect, perennial forb that appears as a rosette of basal leaves and a single flowering stalk (scape). It rises from a taproot and occasionally a branched thickened swelling of the base of the scape (caudex). It can be up to 36 tall in areas with a long growing season, but in Minnesota it is usually 8 to 18 in height.

The leaves are stalked, linear lance-shaped to inversely lance-shaped, 2 to 12 long, and 132 to 13 16 wide. They may be erect or recline on the ground with the tips ascending. The leaf stalks (petioles) may be erect or lay flat on the ground. They are not purple. The leaf blades are long-tapered to a point at the tip. The upper and lower surfaces are hairless or nearly hairless and somewhat covered with a whitish, waxy substance (glaucous). The margins are unlobed and flat, not wavy. Most leaves are untoothed though some may have a few scattered shallow teeth. The midvein is pale green and conspicuous.

The inflorescence is a solitary, medium-sized flower at the end of a single flowering scape. The scape is usually 8 to 18 in height. It is leafless and usually hairless, but sometimes minutely hairy near the top. There are no stalked glands on the scape.

The flower head is 1 to 2 wide. The whorl of modified leaves (bracts) at the base of the flower head (involucre) is inversely cone-shaped or bell-shaped. It is to ¾ long in flower, to 13 16 long in fruit. It is composed of 10 to 50 overlapping bracts (phyllaries) in 2 or 3 series. The phyllaries are sharply pointed and green. They sometimes have a reddish-purple median stripe. They often have purplish-black spots on the surface and purplish-black tips.

The flower head has 15 to 50 ray florets and no disk florets. The strap-like portion of each ray (ligule) is ¼ to 1 long, 1 16to 3 16 wide, and has 5 teeth at the tip. The flowering season is May to September but the flowering period of individual plants is short.

The fruit is a dry, one-seeded seed capsule (cypsela). The cypsela is ribbed, narrowly cone-shaped, and ¼ to long. It tapers to a stout, 1 32 to long, prolonged tip (beak). The beak is usually less than half as long as the body. There is a tuft of 15 to 125 white, 5 16 to 1116 long barbed bristles (pappi) attached at the end of the beak.




8 to 18


Flower Color




Similar Species


Prairie false dandelion (Nothocalais cuspidata) is a shorter plant, no more than 13¾ tall. The leaves are glaucous but the stem is not. The leaf margins are often, but not always, wavy. It is found on dry prairies in sandy or gravelly soils.


Wet. Moist prairies, meadows, wetland edges, stream margins, and swales. Silty soil, clay, and other fine-textured soils.




May to September


Pests and Diseases






Distribution Map



2, 3, 4, 5, 7, 28, 29, 30.









  Kingdom Plantae (green algae and land plants)  
  Subkingdom Viridiplantae (green plants)  
  Infrakingdom Streptophyta (land plants and green algae)  
  Superdivision Embryophyta (land plants)  
  Division Tracheophyta (vascular plants)  
  Subdivision Spermatophytina (seed plants)  
  Class Magnoliopsida (flowering plants)  
  Superorder Asteranae  


Asterales (sunflowers, bellflowers, fanflowers, and allies)  


Asteraceae (sunflowers, daisies, asters, and allies)  
  Subfamily Cichorioideae (chicories, dandelions, and allies)  
  Tribe Cichorieae (lettuce, chicory, dandelion, and salsify)  
  Subtribe Microseridinae  
  Genus Agoseris (mountain dandelion)  


Agoseris glauca (pale agoseris)  

Subordinate Taxa





  Troximon glaucum  

Common Names

  pale agoseris  











A comparatively short and stout, narrow or prolonged tip on a thickened organ, as on some fruits and seeds.



Modified leaf at the base of a flower stalk, flower cluster, or inflorescence.



A short, thickened, woody, persistent enlargement of the stem, at or below ground level, used for water storage.



A dry, one-chambered, single-seeded seed capsule, formed from a single carpel, with the seed attached to the membranous outer layer (wall) only by the seed stalk; the wall, formed from the wall of the inferior ovary and also from other tissues derived from the receptacle or hypanthium, does not split open at maturity, but relies on decay or predation to release the contents.



Pale green or bluish gray due to a whitish, powdery or waxy film, as on a plum or a grape.



A whorl of bracts beneath or surrounding a flower or flower cluster.



In grasses, a membranous appendage at the junction of the leaf and the leaf sheath, sometimes no more than a fringe of hairs. In flowering plants, the flat, strap-shaped, petal-like portion of the corolla of a ray floret.



Long, straight, and narrow, with more or less parallel sides, like a blade of grass.



The modified calyx composed of awns, scales, bristles, or feather-like hairs in plants of the Asteraceae family.



On plants: The stalk of a leaf blade or a compound leaf that attaches it to the stem. On ants and wasps: The constricted first one or two segments of the rear part of the body.



An individual bract within the involucre of a plant in the Asteraceae family.



An erect, leafless stalk growing from the rootstock and supporting a flower or a flower cluster.

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Flower Head

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Fruiting Head

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  Agoseris glauca
Matt Lavin
  Agoseris glauca  

Native perennial herb 8-50 cm tall, flower heads scapose, rays yellow, pappus of capillary bristles, achenes beaked, common in grasslands, sagebrush steppe, meadows, from low to high elevations.




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