Overview

Comprehensive Description

Comments

This little-known species is sometimes confused with Camassia scilloides (Wild Hyacinth), which is more common within the state. Both species are attractive wildflowers with similar habitat preferences. Their appearance is quite similar, which can make them difficult to tell apart. Prairie Hyacinth begins to flower about a month later than Wild Hyacinth and there is little overlap in their blooming periods; this is one good reason why they should be considered separate species. The flowering stalk of Prairie Hyacinth has 3-20 (or more) persistent bracts underneath the blooming flowers, while Wild Hyacinth has 0-2 deciduous bracts underneath the flowers of its stalks. The seed capsules of Prairie Hyacinth are longer than they are wide, while the seed capsules of Wild Hyacinth are about as long as they are wide. The flowers of Prairie Hyacinth tend to have shorter styles, shorter stamens, and tepals that are a little shorter and more deeply colored, but these distinctions are less reliable, or they require the careful use of a ruler or measuring tape in the field.
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Description

This native perennial plant consists of a rosette of basal leaves up to 1½' across and one or more flowering stalks up to 2½' tall. The strap-shaped basal leaves are up to 14" long and 1" across; they are linear, smooth along the margins, and glabrous. Their veins are parallel. These basal leaves are rather floppy and they often arch downward or sprawl across the ground in the absence of support from other vegetation. The basal leaves wither away by mid-summer. The flowering stalks are erect, slender, hairless, and leafless. Each stalk terminates in a raceme of about 20-80 flowers. Each flower consists of 6 lavender to pale blue-violet tepals, 6 stamens with golden yellow anthers, and a light green pistil with a short slender style. Each flower spans about ¾" across when it is fully open. The pedicels of the flowers are slender, green, and deciduous, unless the flower is successfully cross-pollinated. Underneath each flower, there is often a persistent bract about ¾" long that is thread-like in appearance. After the flowers begin blooming on the raceme, there can be 3-20 (or more) of these bracts underneath. Several flowers bloom in a ring at the same time, which forms at the bottom of the raceme and moves upward. The blooming period occurs from late spring to early summer and can last up to 1 month for a colony of plants. The flowers that are successfully cross-pollinated form seed capsules that are ovoid-oblongoid in shape. Each capsule contains several seeds. The root system consists of a bulb with secondary fibrous roots at the bottom. This plant reproduces by forming offsets from the bulbs and by reseeding itself. Cultivation
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Source: Illinois Wildflowers

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Distribution

Range and Habitat in Illinois

Prairie Hyacinth is a rare plant that has been observed in Macon and Peoria counties only (see Distribution Map). At the present time, only one population of plants is known to exist within the state at a railroad prairie. Apparently, the other population has been extirpated. In neighboring states, Prairie Hyacinth has been observed in prairies and thinly-wooded areas. This species is state-listed as 'endangered' in Illinois.
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National Distribution

United States

Origin: Unknown/Undetermined

Regularity: Regularly occurring

Currently: Unknown/Undetermined

Confidence: Confident

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Ark., Ill., Ind., Iowa, Kans., Mo., Okla., Tex.
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Physical Description

Morphology

Description

Bulbs sometimes clustered, globose, 1–3 cm diam. Leaves 3–11, 2–6 dm × 5–20 mm. Inflorescences 27–87 cm; sterile bracts 3–19(–28), bracts subtending flowers shorter than or equaling pedicel. Flowers actinomorphic; tepals withering separately, sometimes connivent over capsules, light blue to lavender, each 3- or 5-veined, 6–10 × 2.2–3.6 mm; anthers bright yellow, 1.5–2 mm; fruiting pedicel incurving-erect, 6–12 mm. Capsules deciduous, pale green to light brown, ovoid-ellipsoid, 6–10 mm. Seeds 2–5 per locule. 2n = 30.
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Diagnostic Description

Synonym

Scilla angusta Engelmann & A. Gray, Boston J. Nat. Hist. 5: 237. 1845; Camassia fraseri Torrey var. angusta (Engelmann & A. Gray) Torrey; Quamasia angusta (Engelmann & A. Gray) Piper
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Ecology

Habitat

Range and Habitat in Illinois

Prairie Hyacinth is a rare plant that has been observed in Macon and Peoria counties only (see Distribution Map). At the present time, only one population of plants is known to exist within the state at a railroad prairie. Apparently, the other population has been extirpated. In neighboring states, Prairie Hyacinth has been observed in prairies and thinly-wooded areas. This species is state-listed as 'endangered' in Illinois.
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Prairies; 100--500m.
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Associations

Faunal Associations

The flowers attract both long-tongued and short-tongued bees, which suck nectar or collect pollen. Other visitors of the flowers include various flies, butterflies, skippers, wasps, and beetles, which suck nectar or feed on pollen. Aside from these flower-visiting insects, little information is available about floral-faunal relations for this wildflower. Photographic Location
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Life History and Behavior

Cyclicity

Flowering/Fruiting

Flowering mid--late spring.
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Conservation

Conservation Status

National NatureServe Conservation Status

United States

Rounded National Status Rank: NNR - Unranked

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NatureServe Conservation Status

Rounded Global Status Rank: G5 - Secure

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Notes

Comments

Camassia angusta flowers two to three weeks later than sympatric populations of C. scilloides.
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