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Thymophylla pentachaeta

(DC.) Small (1903)

This name is accepted

Kingdom: Viridiplantae Phylum: Magnoliophyta Class/Clade: Eudicot-Asterids Order: Asterales Family: Asteraceae Genus: Thymophylla

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Description

Key Characters:

Growth Form:

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Leaves:

Flowers:

Fruit:

Ploidy:

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Elevation Range:

Historical Distribution

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Uses and Culture

USES

Natural History

Statewide Status

Naturalized

Island Status

O'ahu Naturalized

Dispersal Agents


Pollinators

Specimens

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Bibliography

Name Published In: Fl. S.E. U.S.: 1295, 1341 (1903)

Other References

Faccenda, Arthur, et al. 2025:162 (NEWNAT/O)

Occurrences

SNo. Scientific Name Locality Habitat Basis of Record Description Recorded By Record Number Island Source Date
1 Thymophylla pentachaeta Ewa, Campbell Industrial Park area Coral plain. Preserved_Specimen Small, herblike plant with yellow flowers. Mansker, G. Oahu BISH 2005-11-28
2 Thymophylla pentachaeta Kapolei town, empty lot E of Kamokila Blvd. and Kapolei Parkway. In shallow drainage channel alongside a development site. Preserved_Specimen Erect annual plants 1-2 dm tall, diffusely branched. Leaves linear, terete, stiff, 1-2.5 cm long, 0.3-0.5 mm wide, opposite with short bristles at base, grayish green, densely clothed with tiny (0.1 mm long) erect pubescence; leaf tip with a clear, acicular point; tiny brown pellucid glands are embedded in the surface in 2 lines. Heads solitary, terminal on filiform peduncles 3 cm long x 0.3-0.5 mm wide with ca 5 tiny, widely spaced, pellucid glandular glands. Involucre subcylindrical, becoming narrowly funnelform, 5-6 mm long, bracts ca 12 in a single series, linear oblong, 6 mm long x 0.7 mm wide, free to base, margins ciliate, brown pellucid glands embedded in surface, green drying to light brown, base of bract not gibbous; rays bright yellow, 8-10, radiate, 3 mm long x 1 mm wide, apex rounded to sometimes slightly 2-lobed. Disk florets 12-20, 5-merous, bright yellow with bilabiate, exserted arching styles, tubular funnelform, 2 mm long. Achenes dark brown, linear-clavate, 2.5 mm long x 0.3 mm wide, surface minutely antrorse scabrid, crowned by ca 12 narrow scales that grade innto narrow antrorse scabrid bristles. Sprouting prolifically following abundant winter rains. Hobdy, R.W. 4334 Oahu BISH 2011-03-07
3 Thymophylla pentachaeta Leeward Oahu, Barber's Point, along large drainage canal that runs between Campbell Industrial Park and Barber's Point Station On crushed coral substrate along drainage canal road, associated with patches of buffelgrass 1-2 ft. tall, Waltheria, Sida spinosa, and Sida ciliaris. Preserved_Specimen Scattered patches of escaped plants; probably about 500+ plants. Flowering and setting seed. Char, W.P. Oahu BISH 2003-08-06
4 Thymophylla pentachaeta Kapolei town, empty lot E of Kamokila Blvd. and Kapolei Parkway. In shallow drainage channel alongside a development site. Preserved_Specimen Hobdy, R.W. 4335 Oahu BISH 2011-05-07
5 Thymophylla pentachaeta Kapolei town, in an empty lot E of Kamokila Blvd. and Kapolei Parkway. Growing in a dry ditch, near heavy equipment. Preserved_Specimen Woody subshrubs to 20 cm tall. Past flowering. Hobdy, R.W. 4330 Oahu BISH 2010-04-09
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