Hawaiian Names with Diacritics
- Bog beggarticks
Endangered Species Status
Plant Form / Growth Habit
- Non-Woody, Clumping
Mature Size, Height (in feet)
- Herbaceous, Medium, 1-3
- Herbaceous, Tall, Greater than 3
No data available.
Additional Landscape Use Information
Not yet known to be in residential or commercial landscapes. But perhaps could be used as an accent plant as some other koʻokoʻolau are.
Source of Fragrance
- No Fragrance
Plant Produces Flowers
Additional Flower Color Information
The yellow flowers are attractive en masse.
- Medium Green
Additional Pest & Disease Information
Perhaps the same pests that affect other native Bidens spp. such as spider mites, aphids, scale, spittle bugs, slugs and snails.
Additional Water Information
"Water Requirements" of this species are based on habitat.
- Full sun
Additional Lighting Information
"Light Requirements" are based on typical growing needs of Bidens spp. in general.
Natural Zones (Elevation in feet, Rainfall in inches)
- 2000 to 2999, Greater than 100 (Wet)
- 3000 to 3999, Greater than 100 (Wet)
- 4000 to 4999, Greater than 100 (Wet)
Additional Habitat Information
Bidens conjuncta is rare and found scattered in wet forest and bogs, as well as ridges and gulches, from about 2950 to around 4400 feet on montane summits of West Maui.
Koʻokoʻolau (Bidens spp.) are members of the Aster or Sunflower family (Asteraceae). There are nineteen endemic species of Bidens.
The natives are not invasive as are some of the alien species such as kī (Bidens pilosa) with its harpoon-like seeds (kukū) that seem attracted to long pants, socks and shoe laces or the White beggarticks (Bidens alba) that blanket huge areas with "cute-but-don't-grow-them-anyway" white and yellow flowers.
The name Bidens is derived from the Latin bi, two, and dens, teeth in reference to the pappus awns or collective bristles on the achenes (fruit, seeds).
The specific Latin epithet conjucta means "closely connected" or "related."
All Bidens species can hybridize, which should be avoided. Individual species are often restricted to one habitat.
Bidens conjuncta possibly hybridizes with B. micrantha subsp. micrantha but the evidence is inconclusive at present.
Early Hawaiian Use
Leaves of all species of native koʻokoʻolau were used medicinally and for a tea tonic.
All species of koʻokoʻolau can be brewed as a tonic and each are said to have distinct flavors. Regarding Bidens spp., Isabella Abbott comments that "I find that the roughly half a dozen species common in Hawaiʻi offer two or three slightly different flavors, each a bit more subtle than commercial black tea." 
 "Lāʻau Hawaiʻi: Traditional Hawaiian Uses of Plants" by Isabella Aiona Abbott, page 102.
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