Symphyotrichum cordifolium

Symphyotrichum cordifolium, commonly known as common blue wood aster, heartleaf aster, and blue wood-aster, is a perennial herbaceous flowering plant in the family Asteraceae native to central and eastern North America. It reaches heights of up to 1.2 meters and has bluish daisy-like flowers which bloom late-summer and fall in its range.

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Symphyotrichum cordifolium reaches heights of up to 1.2 meters (4 feet). The lower leaves are heart-shaped, while leaves higher on the stem tend to be sessile with more rounded bases. The composite flowers, which have bluish to rarely white ray florets and light yellow disc florets that eventually turn purple, emerge in August and persist into October. Symphyotrichum cordifolium leaves Flower heads showing involucres Close-up of an involucre showing phyllaries Abaxial side of a leaf Flower heads Showing light blue rays Chromosomes S. cordifolium has a chromosome base number of x = 8. Diploid and tetraploid cytotypes with respective counts of 16 and 32 have been reported.

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Medicinal The Ojibwe have used S. cordifolium to make an incense to attract deer. Gardening Symphyotrichum cordifolium is cultivated as a garden plant under its current name and the older name Aster cordifolius. Several cultivars have been selected for garden use, and the following have achieved the Royal Horticultural Society's Award of Garden Merit: 'Chieftain' has "light mauve-blue ray florets". 'Little Carlow' (S. cordifolium hybrid) with "abundant violet-blue" rays. ‘Photograph’ (S. cordifolium hybrid) has "pale lilac-blue flowers". 'Sweet Lavender' with "lavender-blue flowers".

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Reproduction Symphyotrichum cordifolium reproduces vegetatively via short rhizomes, as well as via wind-dispersed seeds. The ray florets of species in the Symphyotrichum genus are exclusively female, each having a pistil but no stamen, while disk florets are bisexual, each with both male and female reproductive parts. Pests and diseases Two rusts have been recorded on S. cordifolium: the brown rust Puccinia dioicae and the red rust Coleosporium asterum.

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Symphyotrichum cordifolium is classified in the subgenus Symphyotrichum, section Symphyotrichum. The species was first formally described by Carl Linnaeus in 1753 as Aster cordifolius. Hybrids Where the range of Symphyotrichum cordifolium overlaps with that of S. puniceum, the F1 hybrid named Symphyotrichum × tardiflorum can occur. Symphyotrichum × schistosum is the hybrid of S. cordifolium and S. laeve var. laeve. A hybrid of S. cordifolium and S. shortii may occur, and this has been named Symphyotrichum × finkii. Hybrids with S. drummondii and S. urophyllum have been reported but not confirmed. Species classifications

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