This can push them over a threshold," said Paul Krushelnycky, an ecologist at University of Hawai'i-Manoa who has studied silverswords since 2007.
Because silverswords cannot self-pollinate, they must bloom synchronously and rely on pollinators for successful reproduction.
While the silversword
ancestor arose from western North American tarweeds about 15 million years ago, the present alliance of 28 Hawaiian species has evolved into its diversity of forms and habitats in the last 6 million years (Baldwin).
Sources of data: Bidens, Sun, 1986; Tetramolopium, Lowrey and Crawford, 1985; silverswords
, Witter and Cart, 1988; dicots, Hamrick and Godt, 1990.
Subsequent generations from the single plant probably evolved into the diverse group of silverswords
now endemic to Hawaii.
are Hawaii's highest-profile plants because of their striking beauty, which has made them icons much like the saguaro cacti of the Southwest.
The cooperative efforts for the recovery of the Hawaiian silversword
, as described in volumes 13(2-3), 23(4-5), and 25(3) of the Endangered Species Bulletin, are exactly what are needed for the numerous other endangered Hawaiian plants.
Adaptive radiation in the Hawaiian Silversword
Alliance (Compositae-Madiinae): A comparison with Hawaiian picture-winged Drosophila.
One chore for the Bruins will be the hectic schedule, even if UCLA does the expected and begins the tournament with a blowout of the Silverswords
Of the many endangered plant species in the Hawaiian Islands, silverswords
have the highest profile due to their radiant beauty and the severity of the threats confronting them.
There is no team nicknamed the Silverswords
served up to a Duke or Kentucky in the first round.
As ungulate populations increased, silverswords
declined severely in range and number, presumably due to heavy browsing.
Chloroplast DNA evidence for a North American origin of the Hawaiian silversword
alliance in the tribe Madieae, 43 species in three genera (Carr et al.
Pacific Ocean, the silversword
alliance (Asteraceae), Schiedea Chain.