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Isodendrion longifolium

Isodendrion longifolium A. Gray

Longleaf Isodendrion

Violaceae (Violet family)

Synonym(s): Isodendrion maculatum

USDA Symbol: ISLO2

USDA Native Status: HI (N)

Rare. Shrub with sweetly-fragrant flowers.

The major threats to this species are feral goat, pigs and competition with introduced plant species. (Bibref: 1789).


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Plant Characteristics

Duration: Perennial
Habit: Shrub
Leaf Arrangement: Alternate
Leaf Complexity: Simple
Leaf Shape: Lanceolate
Leaf Pubescence: Villose
Leaf Texture: Leathery
Breeding System: Flowers Bisexual
Inflorescence: Axillary
Size Notes: From 60 to 200 cm. in height.
Leaf: Stipules glabrous, 1.9 to 3 mm long, obliquely linear-lanceolate. Leaves glabrous, subcoriaceous, finely reticulate-veined, linear-oblanceolate 6.5 to 22 cm long, 11 to 30 mm wide, obscurely undulate, remotely low sub-serrate or distinctly serrulate, base abruptly short cuneate, apex subacute. (Reslit: 2850).
Flower: "Flowers solitary in axillary short shoots; corolla caducous, blue, weakly zygomorphic, petals prolonged into a "tube" with bottom petal slightly longer than others and weakly differentiated, scarcely saccate at base; filaments free, anthers dehiscing laterally". (Bibref: 1788). Sepals five, distinct, unequal, persistent, glabrous throughout. Petals five; lower petal 6 to 10 mm long. Stamens 5, unequal or subequal, free on the receptacle, not apiculate; filaments ligulate. (Reslit: 2850).
Fruit: Fruit is a capsule. (Bibref: 1786). Thick-walled. (Bibref: 1788). "Petals and stamens marcescent, persisting around the fruit." (Bibref: 1788).

Bloom Information

Bloom Color: White , Purple
Bloom Notes: Corollas white with purple longitudinal stripes.


Native Distribution: Endemic to the Hawaiian islands of Oahu and Kauai. (Webref: 28).
Native Habitat: Gulch slopes and bottoms in moist or sometimes wet forests. (Webref: 28).


Use Ornamental: Owing to the rarity of this species and its imperilied status, no horticultural use is warranted.
Fragrant Flowers: yes

U.S. Fish & Wildlife Service Threatened & Endangered Status

USFWS Species Profile: Q109
Status: Threatened
Historic Range: U.S.A. (HI)
Critical Habitat: 17.96(a)
Special Rules: N/A
This information is derived from the U.S. Fish & Wildlife Serrvice Environmental Conservation Online System.

Web Reference

Webref 6 - Germplasm Resources Information Network - (GRIN) [Online Database] (2018) USDA, ARS, National Genetic Resources Program, National Germplasm Resources Laboratory, Beltsville, Maryland.
Webref 27 - USDA Plants Database (2018) USDA, NRCS.

Additional resources

USDA: Find Isodendrion longifolium in USDA Plants
FNA: Find Isodendrion longifolium in the Flora of North America (if available)
Google: Search Google for Isodendrion longifolium


Record Modified: 2021-01-01
Research By: JAM

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