|A. sandwicense||Natural Hybrid||A. virescens|
Two unusual greenswords occurring on Puu Alaea in 1989 reportedly possessed vegetative features characteristic of the presumed extirpated species, Argyroxiphium virescens. One of these Puu Alaea plants flowered in August, 1989, allowing detailed comparisons with preserved specimens of Argyroxiphium virescens as well as other species and hybrids of Argyroxiphium native to E Maui. These comparisons suggest that the unusual Puu Alaea greenswords represent remnants of hybridization between the now presumably extinct A. virescens and the more common Haleakala silversword, A. sandwicense ssp. macrocephalum, that still occurs at and adjacent to this site. Pollen stainability in this hybrid was 62%. Chromosome pairing data are not available.
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