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Transcription
52
Notes on the Vegetation of Faker Island
by C. R. Long
Vascular Plants Recorded from Baker Island
Twenty-four species of vascular plants have been recorded and/or collected
from Baker Island. Of these, eight species are considered native. The remaining
sixteen species are accidental or deliberate introductions. Of the sixteen
introduced species only three (i.e., Digitaria, Portulaca oleracea and
Euphorbia hirta) appear to have naturalized to any extent. Digitaria is the
only species which appears likely to compete with the native vegetation over
large areas of the island.
Collections of vascular plants from Baker Island have been made by the
following: E. Christophersen, September 1924; D. Coman, November 1935;
E. H. Bryan, Jr., July 1938; P. Marshall, July 1963; C. R. Long, July and
October 1964.
Gramineae
Cenchrus echinatus L.
Long 2173 (UH). Three clumps of this burrgrass were confined to the sandy
ridge of the southwest end of the island. Introduced and apparently not
spreading. First collected in July 1964 probably of World War II introduction.
Cynodon dactylon (L.) Pers.
Long s. n. (UH). One large clump in sand on the southwest end. Probably
of World War II introduction.
Digitaria pacifica Stapf.
Christophersen 38 (BISH) as Panicum stenotaphroides, Bryan 1321 (BISH),
Marshall 1 (USNM), Long 2172 (UH). Common in disturbed sites of the central
area, on the runway and in sand on the west ridge forming pure stands. From
a comparison of Bryan's photographs with those taken by BOBSP in 1964-65 it is
apparent that this species forms a greater portion of the vegetation cover. A
ready colonizer of disturbed sites first collected on Baker Island in 1924 and
probably introduced during the era of guano mining.
Eragrostis tenella (Link) Beauv. = E. amabilis (L.) W. and A.
D. Coman s. n. (BISH). Probably introduced by a landing party in this
century after Christophersen's visit.
Eragrostis whitneyi Fosberg
E. Christophersen 30 (BISH) as E. falcata (Gaud.) Gaud. If Fosberg's