Aster family (Asteraceae)
Description: This herbaceous perennial plant is up to 3' tall and unbranched. The stout central stem is greyish or reddish green and covered with coarse white hairs. Most of the leaves occur near the base of the plant, although a few of them alternate along the lower 1/3 of the stem. They are up to 9" long and 2" across, and narrowly lanceolate, oblanceolate, or ovate. The margins are smooth, but often curl upward, while the upper and lower surfaces of the leaves are covered with fine white hairs. Leaf venation is primarily parallel, although a few fine pinnate veins may be present.
A single daisy-like composite flower develops at the top of the stem. It is about 3" across, consisting of a prominent reddish brown cone of disk florets, which are surrounded by 12-20 light purple ray florets. The ray florets are long, slender, and droop downward. There is no noticeable floral scent. The blooming period occurs during early summer and lasts about 3 weeks, after which the ray florets shrivel away and the central cone turns black. The achenes are without tufts of hair. The root system consists of a stout taproot.
Cultivation: The preference is full sun and average to dry conditions. The soil can contain loam, clay, or rocky material. There is a tendency for Pale Purple Coneflower to flop over when in bloom if it is pampered by too much water or lacks adequate support from adajacent vegetation. It doesn't seem to be bothered much by disease, and withstands drought very well. Development is slow unless ample sunlight is received. This plant can fail to survive the winter if the central taproot is not covered with sufficient soil.
Range & Habitat: Pale Purple Coneflower occurs occasionally throughout Illinois, except in some of the southern counties (see Distribution Map). It is native to Illinois. Habitats include mesic to dry black soil prairies, openings in dry rocky woods, Oak savannas, limestone glades, abandoned fields, and open areas along railroads. It is possible that this plant occurred in gravel or dolomite prairies before these habitats were largely destroyed by development.
Faunal Associations: Long-tongued bees, butterflies, and skippers are the most important visitors to the flowers. Among the long-tongued bees, are such visitors as bumblebees, Nomadine cuckoo bees, large carpenter bees, and leaf-cutting bees. Short-tongued green metallic bees and other Halictine bees also visit the flowers occasionally. The caterpillars of the butterfly Chlosyne nycteis (Silvery Checkerspot) feed on the foliage, while caterpillars of the moths Synchlora aerata (Wavy-Lined Emerald) and Eupithecia miserulata (Common Eupithecia) feed on the flowerheads. Goldfinches occasionally eat the seeds. Mammalian herbivores, particularly livestock, may eat this plant occasionally, but it is not a preferred food source.
Photographic Location: The photographs were taken at the Red Bison Railroad Prairie in Savoy, Illinois.
Comments: This plant usually precedes Echinacea purpurea (Purple Coneflower) in bloom by about 2-4 weeks. Sometimes their flowers are difficult to tell apart, but the leaves of Pale Purple Coneflower are more long and narrow, hairier, lighter green, and tend to remain near the base of the plant.