CPC Plant Profile: Na Pali Rockwort
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Plant Profile

Na Pali Rockwort (Nototrichium divaricatum)

Closeup of mature flowering specimen. Photo Credit: K. Wood
Description
  • Global Rank: G1 - Critically Imperiled
  • Legal Status: N/A
  • Family: Amaranthaceae
  • State: HI
  • Nature Serve ID: 157057
  • Date Inducted in National Collection: 09/28/2021

There are three Nototrichium species endemic to Hawaii, one is endangered, one is apparently secure, and N. divaricatum is listed as a species of concern. This particular species, N. divaricatum, is a shrub that can grow up to 50 centimeters (20 in) tall. The leaves of N. divaricatum are silver-white, and their flowers are tinged purple (New York Botanical Garden [NYBG] 2002). N. divaricatum differs from other species of the genus by its compound, branched inflorescences with divaricate (spreading apart) branches and shorter spikes, 5 to 20 millimeters long with 8 to 30 flowers per spike (Herbst & Wagner 1999).

Participating Institutions
Updates
Nature Serve Biotics
  • 05/02/2017

Nototrichium divaricatum is endemic to three valleys on the northwestern side of Kauai Island, Hawaii. The species possibly numbers fewer than 3,000 plants. It is threatened primarily by the large number of feral goats destroying the native vegetation of these valleys. Additional threats include feral pigs, invasive alien plants, and landslides.

  • 01/01/2010

Threats to N. divaricatum include goats, Erigeron karvinskianus (daisy fleabane), Rubus argutus (Florida prickly blackberry), Lantana camara (lantana), Kalanchoe pinnata (air plant), and land slides.

  • 01/01/2010

Number of Populations: 3 (USFWS 2001) Number of plants: >1200 (USFWS 2001)

  • 01/01/2010

None known.

  • 01/01/2010

The National Tropical Botanical Garden (NTBG) currently has ex situ holdings of seeds in its seed bank, which represents all three populations.

  • 01/01/2010

1. Secure all wild populations through habitat management. 2. Map genetic diversity in the surviving populations of N. divaricatum. 3. Test the influence of weeding and fencing on populations of N. divaricatum. 4. Conduct pollination biology and reproductive studies. Recommendations derived from M.H. Chapin and M. Maunder.

  • 01/01/2010

1. Establish secure ex situ stocks with full founder representation. 2. Develop proper horticultural protocols and pest management for N. divaricatum. 3. Survey ex situ holdings and conduct molecular finger printing of N. divaricatum. Recommendations derived from M.H. Chapin and M. Maunder.

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Photos
Nomenclature
Taxon Nototrichium divaricatum
Authority Lorence
Family Amaranthaceae
CPC Number 15860
ITIS 565323
USDA NODI
Common Names kuluI | Na Pali rockwort
Associated Scientific Names Nototrichium divaricatum
Distribution N. divaricatum is endemic to three valleys on the northwestern part of Kauai (NatureServe 2001).
State Rank
State State Rank
Hawaii S1
Habitat

N. divaricatum is found on precipitous slopes with small pockets of forest and vertical cliffs. They are located at approximately 600 to 1100 meters (2,000 to 3,600 ft) elevation (Herbst & Wagner 1999).Associated species of N. divaricatum include P. mannii (manns bluegrass), Stenogyne campanulata (no common name [NCN]), Lysimachia glutinosa (NCN), Melicope pallida (alani), Nototrichium sp. nov. (Kului), Daubutia sp. (naenae), Acacia koa (koa), Dryopteris unidentata (NCN), Coprosma sp. (pilo), Vaccinium dentataum (NCN), Lipochaeta sp. (nehe), Wilkesia sp. (iliau), Lobelia niihauensis (oha), Chamaesyce sp. (akoko), and Exocarpus sp. (heau).

Ecological Relationships

N. divaricatum is wind pollinated with seeds that are bird dispersed (Sakai et al. 1995).

Pollinators
Common Name Name in Text Association Type Source InteractionID

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