Isodendrion pyrifolium A. Gray
Wahine Noho Kula
Violaceae (Violet family)
Synonym(s): Isodendrion hawaiiense, Isodendrion hillebrandii, Isodendrion lanaiense, Isodendrion molokaiense, Isodendrion remyi
USDA Symbol: ISPY
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 CharacteristicsDuration: Perennial
Leaf Arrangement: Alternate
Leaf Complexity: Simple
Leaf Shape: Elliptic , Ovate
Leaf Pubescence: Villose
Leaf Margin: Serrulate
Leaf Texture: Papery
Breeding System: Flowers Bisexual
Size Notes: To about 2 m in height.
Leaf: "Leafy branchlets 1.5-3 mm. in diameter, leafy for 5-2 0 mm., bearing 4 -8 leaves in a term inal crowd ed plume, the leaves mostly ascending; this upper stem closely appressed white puberulent but stem and hairs both largely concealed by the crowded, imbricate stipules ; stipules 4-4.7 mm. long, narrowly deltoid; slightly oblique, the heavy raised midrib densely app ressed puberulent, the sides brown membranous and ciliolate; petioles 5- 9 mm. lon g, slender, closely appressed white puberulent; blades 2.5- 5.4 cm. long, 12-28 mm. wide, chartaceous, above dark green, subglabrate except for the veins towards the base, below paler and appressed puberulent, ovate or even elliptic, the margin subentire or on the larger leaves barely subserrulate, the veins not conspicuous;" (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. Petals five. Stamens 5, unequal or subequal, free on the receptacle ; 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 InformationBloom Color: Green
Bloom Notes: Corollas pale green.
Native Distribution: Endemic to the Hawaiian islands of Oahu, Hawaii, Maui, Lanai, Niihau and Kauai. (Webref: 28).
Native Habitat: Dry shrublands. (Webref: 28).
BenefitUse 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 StatusUSFWS Species Profile: Q1XKStatus:
BibliographyBibref 1789 - Endangered and Threatened Wildlife and Plants; Determination of Endangered or Threatened Status for Fourteen Plant Taxa From the Hawaiian Islands (1996) Rogers, John G.
Bibref 1788 - The Families and Genera of Vascular Plants - Volume 11 (eBook) (2014) Kubitzki, K. (editor)
Search More Titles in Bibliography
Web ReferenceWebref 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 resourcesUSDA: Find Isodendrion pyrifolium in USDA Plants
FNA: Find Isodendrion pyrifolium in the Flora of North America (if available)
Google: Search Google for Isodendrion pyrifolium
MetadataRecord Modified: 2021-01-01
Research By: JAM