52 
cock” or “Thimble Berry” that has become a pest on the island of 
Hawaii. He has now prepared a second and final report, which 
contains the information available in August together with data 
obtained since then. I transmit a copy of Mr. Rock’s report here • 
with. 
Very respectfnlly, 
Ralph S. Hosmer, 
Superintendent of Forestry. 
Honolulu, Hawaii, January 22, 1910. 
Mr. R. S. Flosmer, Superintendent of Forestry, 
Honolulu, T. H. 
Sir : — I beg to present herewith a supplementary report on the 
so-called “Hitchcock” or Thimble Berry, now a pest on Parker 
Ranch, Hawaii. 
Last August during your absence from Honohihi, I presented a 
preliminary re])ort on the above mentioned plant to Mr. IMarston 
Campbell, president and executive officer of this Board. 1 stated 
then that I was unable to identify positively the s])ecific name of 
the troublesome plant in question. 1 determined it as belonging to 
the family Rosaccac genus Rubits Sect. IX. Lampobatns and being 
J'tubus jamaicensis (?). 
Further investigation^showed that the plant resembles strongly 
Riibiis rosacfolius though also on the other hand Rubiis jamai- 
censis. In Waipio Valley, Hawaii, I found a raspberry almost 
identical with the one occurring on Parker Ranch with the excep 
tion of the very showy double fiowers ; this latter species has all 
the characters of Rub us rosaefoUiis, a cosmopolitan plant occur- 
ring in all warmer countries, especially in the West Indies where 
it grows wild in the mountains. 
In order to get more definite data regarding the introduction 
of the plant I communicated with Mr. D. Howard Hitchcock who 
informed me that the plant in question was brought here by his 
father in the early eighties from Jamaica. As there are only two 
species of raspberries endemic in Jamaica, namely, Rubiis jainai- 
ccitsis and Rnbus alpiiiiis, the latter however less common besides 
the wild growing cosmopolitan species Rub us rosacfolius, I came 
now to the conclusion and can state definitelv that said plant is a 
cross (perhaps a natural cross) of Rubits jamaicensis and Rubus 
rosacfolius, as the characters of both species are more or less con- 
stant in the various plants of our Thimble Berry. 
The following is a description of Rubus jainaiccnsis and 
rosacfolius: 
(a) An erect bush evergreen in warm countries, glabrous or 
somewhat pubescent-hirsute: leaves odd-pinnate, the lateral leaf- 
lets 2-7 pairs, all the leaflets ovate-lanceolate or lance-oblong. 
