Baptisia australis
| Blue False Indigo | ||||||||||||||
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| Baptisia australis Hort. ex Lehm. |
Baptisia australis, commonly known as Blue Wild Indigo or Blue False Indigo, is a herbaceous perennial in the pea family. It is native to much of the central and eastern North America and is particularly common in the Midwest, but it has also been introduced well beyond its natural range. The plant may attain a height of 1.5 meteres (5 feet) and a width of 1 metre (3.2 feet), but most often it is encountered at about 1 metre tall (3.2 feet) with a 0.6 metre spread (2 feet). It is well known in gardens due to its attractive pea-like, deep blue flowers that emerge on spikes in the late fall and early summer. Its low maintenance and hardiness, as well as the application of the seed pods in flower arrangements also contribute to its popularity. Several American Indians tribes made use of the plant for a variety of purposes. The Cherokees used it as a source of blue dye, a practice later copied by European settlers. They also would use the roots in teas as a purgative or to treat tooth aches and nausea, while the Osage made an eyewash with the plant.[2]
The name of the genus is derived from the Ancient Greek word bapto, meaning “to dip" or "immerse”,[3] while the specific name australis is Latin for "southern". Additional common names of this plant exist, such as Indigo Weed, Rattleweed, Rattlebush and Horse Fly Weed. The common name "blue false indigo" is derived from it being used as a substitute for the superior dye producing plant, namely Indigofera tinctoria. B. australis grows best in lime free, well-drained stony soil in full sun to part shade. Naturally it can be found growing wild at the borders of woods, along streams or in open meadows. It often has difficulting seeding itself in its native areas due to parasitic weevils that enter the seed pods, making the number of viable seeds very low.[2]
Description
B. australis is an herbaceous perennial that reproduces both sexually and asexually by means of its spreading rhizomes. The plants are erect and emerge from the rhizomatic network. The roots themselves are branched and deep, which helps the plant withstand periods of drought. When dug up they are woody and black in colour and show tubercles, wart-like projections found on the roots. The plants branch extensively about halfway up. The stems are stour and glabrous, or hairless. If they are broken, a sap will be secreted that turns a dark blue upon contact to the air.[2]
The trifoliate leaves are a grey-green in colour and are arranged alternately. The leaves are further divided into clover-like leaflets that are obovate in shape, or wider towards the apex. Flower spikes appear in June. Emerging at the pinnacle ar short, upright terminal racemes that have pea-like flowers that vary in colour from light blue to deep violet. The flowers, which bloom from April through August depending on the region, are bisexual and are roughly 2.5 cm long (1 inch). The fruit is a bluish black inflated and hardenend pod that ranges from 2.5 to 7.5 cm in length (1 to 3 inches) by 1.25 to 2.5 cm (0.5 to 1 inch). They are oblong in shape and are sharply tipped at the apex. At maturity they will contain many loose seeds within. The seeds are yellowish brown, kidney shaped and about 2 mm (0.08 inches) in size.The leaves emerge about one month before flowering and are shed approximately one month after the pods form. Once the seeds are fully mature, the stems turn a silverish grey and break off from the roots. The pods stay attached and are blown with the stems to another location.[2]
Taxonomy
There are three recognised varieties of B. australis, namely:
- B. a. var. abberans
- B. a. var. australis
- B. a. var. minor[2]
Cultivation
B. australis is well suited as a border plant in gardens as it often grows to about 3 feet in height. It is commonly used due to its showy blue flowers that emerge in June and July. Furthermore, it can be easily propagated by division at the roots. [4]
Uses
Baptisia has been used as an antiseptic, anti-catarrhal, febrifuge,and stimulant purgative. This plant is said to stimulate immune responses to infection, and is used for ear, nose and throat problems, laryngitis, tonsillitis, as a wash for mouth ulcers, and a douche for leucorrhea. Baptisia is considered toxic. Do not use this plant unless under the supervision of a trained qualified practitioner. It is not for long term use and not to be used if pregnant. The bark of the root is harvested in autumn. The leaves may be harvested anytime.
Native Americans used root tea of False blue indigo as an emetic and purgative. A cold tea was given to stop vomiting, a root poultice used as an anti-inflammatory, and bits of the root were held in the mouth to treat toothaches. Baptisia species are being investigated for use as a potential stimulant of the immune system. A decoction of stems has been used for pneumonia, tuberculosis and influenza, tips of stems combined with twigs of the Utah juniper, Juniperus osteosperma, have been used as a kidney medicine. Baptisia has also been used as a tea (tisane) for smallpox and externally as a cleansing wash. Trials using the extract of Baptisia to treat typhoid fever were made in the early 19th century. Current uses for this plant include: infection of upper respiratory tract, common cold, tonsillitis, stomatitis, inflammation of mucous membrane, fever, ointment for painless ulcers, inflamed nipples. Over-medicating will produce vomiting, diarrhea, gastrointestinal complaints, and spasms due toquinolizidine alkaloid content.
The pods are good in dried arrangements.
Wild blue indigo is said to repel flies when kept near farm animals. Hang a bunch of Baptisia off the tack of a working animal.
This plant is used in Witchcraft in spells or rituals of protection. Keep a leaf in your pocket or add to an amulet for protection.
References
- ↑ "Baptisia australis". NatureServe Explorer. NatureServe. Retrieved 2007-06-19.
- ↑ 2.0 2.1 2.2 2.3 2.4 Broyles, Patrick J. (2004), Blue Wild Indigo (PDF), retrieved 2007-06-19
- ↑ Perry, Leonard, Baptisia, University of Vermont, retrieved 2007-07-10
- ↑ Pink, Alfred (2004). Gardening for the Million. Project Gutenberg Literary Archive Foundation. Check date values in:
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