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Conoclinium coelestinum

Conoclinium coelestinum (L.) DC.

Eupatorium coelestinum L.

Mist-flower, Blue Mistflower, Blue Boneset

KingdomPlantaePlants, but not fungi, lichens, or algae (from Stearn’s Botanical Latin)
SubkingdomTracheobiontaVascular plants—plants with a “circulatory system” for delivering water and nutrients
DivisionMagnoliophytaFlowering plants, also known as angiosperms
ClassMagnoliopsidaDicotyledons—plants with two initial seed leaves
SubclassAsteridaeA large class that encompasses asters
OrderAsteralesFlowering plants with a central disk flower and surrounding petals, like daisies
FamilyAsteraceaeThe aster family, which also includes daisies and sunflowers; from the Greek ἀστήρ, “star,” for the star-shaped flowers
GenusConocliniumFrom Greek κῶνος (konos), “cone;” and κλινίον (klinion), “little bed”
Speciescoelestinum“Sky blue,” for the flower color

About plant names...

Blue mistflower is native to North America.

Identification: Plants are 18-36" (45-91 cm) in height. Leaves are roughly triangular (deltate), opposite, wrinkly, with blunt teeth (dentate or dentate-crenate), up to 3" (7.6 cm) × 2" (5 cm). Flowers appear in clusters that are almost flat-topped, and 1-3" (2.5-7.6 cm) around. The flowers are brushlike disc flowers—composed of 40-50 threadlike disc florets—that are blue or purple.[1] Flowers are ¼-⅜" (6.3-9.5 mm) in size, appearing from July to October. Technically these are composite flowers, like other members of the enormous aster family, but this species lacks ray flowers.

Online References:

Conoclinium coelestinum at Illinois Wildflowers

Conoclinium coelestinum on jeffpippen.com

Conoclinium coelestinum on Wildflowers of the United States

Conoclinium coelestinum on FLORIDATA

Conoclinium coelestinum at the Missouri Botanical Garden

Conoclinium coelestinum at the Lady Bird Johnson Wildflower Center

1Steve Christman at Floridata says others have described the unique color as clear blue, powder blue, azure blue, bluish-purple, reddish-purple, blue-pinkish, and pink-purplish. He prefers 'sky-blue pink.'

Conoclinium coelestinum description by Thomas H. Kent, last updated 1 Nov 2013.

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Conoclinium coelestinum (Mist-flower, Blue Mistflower, Blue Boneset)

4/14/2015 · Everglades National Park, FL
≈ 2½ × 2½" (7.1 × 6.3 cm)

Conoclinium coelestinum (Mist-flower, Blue Mistflower, Blue Boneset)

4/13/2015 · Ernest F. Coe Visitor Center, Everglades National Park, FL
≈ 4 × 4½" (10 × 11 cm)

Conoclinium coelestinum (Mist-flower, Blue Mistflower, Blue Boneset)

9/1/2013 · Colonial Williamsburg, Williamsburg, VA
≈ 33 × 49" (83 × 125 cm)

Conoclinium coelestinum (Mist-flower, Blue Mistflower, Blue Boneset)

9/1/2013 · Colonial Williamsburg, Williamsburg, VA
≈ 33 × 34" (83 × 86 cm)

Conoclinium coelestinum (Mist-flower, Blue Mistflower, Blue Boneset)

4/13/2015 · Ernest F. Coe Visitor Center, Everglades National Park, FL
≈ 6 × 4" (16 × 10 cm)

Conoclinium coelestinum (Mist-flower, Blue Mistflower, Blue Boneset)

9/1/2013 · Colonial Williamsburg, Williamsburg, VA
≈ 12 × 14" (29 × 34 cm)

Range: Zones 4-11:

About this map...