|E. pallida with butterfly|
Rudbeckia pallida Nutt.
Echinacea pallida (Nutt.), commonly called Pale Purple Cone-flower, is a species of herbaceous perennial plant in the family Asteraceae. It is sometimes grown in gardens and used for medicinal purposes. Its native range is the south central region of the United States.
E. pallida is similar to E. angustifolia, but plants often grow taller, ranging from 1.5 to 2.5 ft (45 to 75 cm) tall, with some growing 3 feet (90 cm) or more tall. Plants normally grow with one unbranched stem in the wild, but often produce multi-stemmed clumps in gardens. They have deep taproots that are spindle shaped, wider in the center and narrowing at the ends. Stems are green in color or mottled with purple and green. The leaves are elongated lanceolate or linear-lanceolate in shape with three veins. Flower head rays are narrow, linear, elongated, and drooping, ranging from 1 to 3 inches (2.5 to 7.6 cm) long. The flower heads are from ¾ to 3 inches (2 to 7.6 cm) wide with pale rose-purple or nearly white colored petals. The flowers have white pollen. The fruits are cypselae and are tan or bi-colored with angled edges.
Habitat and range 
It is native to the United States where it is found growing in dry soils, in rocky prairies, open wooded hillsides, and glades. It grows natively as far north as Michigan and southward into Alabama and Texas, and has been introduced outside of its native range into Connecticut, Georgia, Maine, Massachusetts, Minnesota, New York, North Carolina, and Virginia. E. pallida blooms from May into July. The states of Tennessee and Wisconsin list the species as threatened, mostly due to habitat loss and over-collection of roots, which are made into herbal medicine. The use of Echinacea as a medicinal plant has not been demonstrated to have any positive health effects.
- Turner RB, Bauer R, Woelkart K, Hulsey TC, Gangemi JD (July 2005). "An evaluation of Echinacea angustifolia in experimental rhinovirus infections". N. Engl. J. Med. 353 (4): 341–8. doi:10.1056/NEJMoa044441. PMID 16049208.
- Schwarz E, Metzler J, Diedrich JP, Freudenstein J, Bode C, Bode JC (2002). "Oral administration of freshly expressed juice of Echinacea purpurea herbs fail to stimulate the nonspecific immune response in healthy young men: results of a double-blind, placebo-controlled crossover study". J. Immunother. 25 (5): 413–20. doi:10.1097/00002371-200209000-00005. PMID 12218779.
- Barrett BP, Brown RL, Locken K, Maberry R, Bobula JA, D'Alessio D (December 2002). "Treatment of the common cold with unrefined echinacea. A randomized, double-blind, placebo-controlled trial". Ann. Intern. Med. 137 (12): 939–46. doi:10.1001/archinte.137.7.939. PMID 12484708.
- Yale SH, Liu K (June 2004). "Echinacea purpurea therapy for the treatment of the common cold: a randomized, double-blind, placebo-controlled clinical trial". Arch. Intern. Med. 164 (11): 1237–41. doi:10.1001/archinte.164.11.1237. PMID 15197051.
- Echinacea (Echinacea purpurea, Echinacea angustifolia, Echinacea pallida) [NCCAM Herbs at a Glance]
- Log In Problems
- Britton, N., & Brown, A. (1913). An illustrated flora of the Northern United States, Canada from Newfoundland to the parallel of the southern boundary of Virginia, and from the Atlantic Ocean westward to the 102nd meridian. [S.l.]: Scribner. ISBN 0-486-22644-1
|This Heliantheae article is a stub. You can help Wikipedia by expanding it.|