Monday, December 28, 2020

[Botany • 2020] Cyanea heluensis (Lobelioideae, Campanulaceae) • A New Species of Cyanea Gaud. from Maui, Hawai`i

Cyanea heluensis H. Oppenheimer 

in Oppenheimer, 2020. 
Cyanea heluensis H. Oppenheimer, sp. nov.a new, narrowly distributed endemic species, is herein described and illustrated with line drawings and digital field photos. It is currently known from a single mature plant and is restricted to the upper Helu planeze on leeward Mauna Kahalawai, West Maui, Hawaiian Islands. It differs from all other species of Cyanea Gaudich. with its narrow, shallowly lobed leaves, gently curved muricate corollas, and undulate sepals caducous in fruit. A key to the new species and its congeners on Mauna Kahalawai is provided. Its conservation status and efforts to propagate the species are discussed.

Keywords: conservation, Hawaiian Islands, IUCN Red List, Plant Extinction Prevention Program

Figure 1. Cyanea heluensis H. Oppenheimer
A habit B close up of flower buds prior to anthesis. Note murications on petioles and corolla.
Photos by H. Oppenheimer. 

Figure 2. Cyanea heluensis H. Oppenheimer 
A flowering stem B close-up of flowers.
Photos by H. Oppenheimer.
Cyanea heluensis H.Oppenh., sp. nov.
Diagnosis: Species allied to C. asplenifolia (H. Mann) Hillebr., but differs in its very shallowly lobed leaves (vs. deeply lobed to pinnate-pinnatifid), longer and wider corolla, and larger, undulate sepals (Fig. 3).

Etymology: The specific name honors Helu, a peak on Mauna Kahalawai (aka West Maui Mountains) Lit. scratch or count (Pukui et al. 1966); + Latin suffix -ensis, indicating a place of origin or growth.

Figure 4. Cyanea heluensis H. Oppenheimer 
A seedling at Olinda Rare Plant Facility. Plant is approximately 1 year old
B distribution Cyanea heluensis of on Maui, Hawai`i.
Photo by H. Oppenheimer.

Hank Oppenheimer. 2020. A New Species of Cyanea Gaud. (Lobelioideae, Campanulaceae) from Maui, Hawai`i. PhytoKeys. 167: 1-11. DOI: 10.3897/phytokeys.167.55107