CYRTANDREAE HAWAIIENSES, SECT. MICROCALYCES 
HILLEBR. 
Joseph F, Rock 
The present paper concludes the monograph of the Hawaiian represen- 
tatives of Cyrtandra/ which number ninety-five species, varieties, and 
forms. The Hawaiian species were divided by Hillebrand into five more 
or less well-defined sections as follows: Cylindrocalyces, Crotonocalyces, 
Schizocalyces, Chaetocalyces, and Microcalyces. Hillebrand's system 
has been here adhered to rather than that of C. B. Clarke, who includes 
foreign species with Hawaiian species in some of his sections. The latter 
arrangement does not seem to be a satisfactory one, for what must be recog- 
nized as a variety of a species is to be found in a different section from 
that to which the species is referred. Krauflein in his paper on the Philip- 
pine Cyrtandreae says that C. B. Clarke's arrangement is for the present 
still quite satisfactory, which of course may be true for the Philippine and 
Malayan species, but certainly not for the Hawaiian species. The writer 
has described sixteen new species, twenty-one new varieties, and six new 
forms, all of which save one (C. cyaneoides) are described in the present 
series of papers. 
Through the courtesies extended the writer by the directors of the various 
herbaria in Europe where he worked shortly before the outbreak of the 
recent war, and through the loan of material from the Gray Herbarium 
and the Cornell Herbarium, the writer was in a position to unravel the 
existing confusion in this difficult group of plants. The writer is especially 
indebted to Prof. B. L. Robinson of Harvard and to Dr. Rowlee and Prof. 
Hosnier of Cornell for the loan of material at a time when transportation 
facilities are more or less upset and when the shipping of types is exceedingly 
hazardous. 
That there remain additional new species of Cyrtandreae to be dis- 
covered in Hawaii there is no doubt; especially will Kauai yield a goodly 
number from the little explored gorges on the windward side. Cyrtandreae, 
like the Hawaiian Lobelioideae, are very local, and it is therefore to be 
expected that the numerous deep ravines on the windward side of Oahu 
and the other islands will furnish new species; the Punaluu region on Oahu 
is a veritable paradise for the botanist and as splendid a collecting ground 
as is to be found anywhere in this group of islands. Cyrtandreae are espe- 
cially abundant there in the deep shade along the numerous watercourses. 
^ For the previous papers of the series, see Amer. Journ. Bot. 4: 604-623. 1917^ 
Ibid. 5: 259-277. 1918. Ibid. 6: 47-68. 1919. 
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