98 BOTANICAL GAZETTE [august 



Bidens dichotoma (Hillebr.), comb. nov. — Compylotheca dichot- 

 oma Hillebr., loc. cit., 212. 



Bidens mauiensis (Gray), comb. nov. — Coreopsis mauiensis 

 Gray, Proc. Amcr. Acad. 5:125. 1862; Campyloiheea mauiensis 

 Hillebr., loc. cit., 213. 



Bidens cosmoides (Gray), comb. nov. — Coreopsis (Campylo- 

 tJieea) cosmoides Gray, loc. cit., 126. 



Bidens Menziesii (Gray), comb. nov. — Coreopsis (Campylo- 

 iheca) Menziesii Gray, loc. cit., 127. 



A most remarkable feature of the flora of the Hawaiian Islands 

 is the large number of endemic species. For a number of years 

 botanists have been cognizant of this pronounced degree of 

 endemism (cf. Hillebrand, Fl. Hawaiian Isls. pp. xv and xxv. 

 1888; MacCaughey, Amer. Botanist 22:45-52. 1916; Bot. Gaz. 

 64:89-114. 1917; loc. cit., 66:273-275. 1918). Furthermore, the 

 scanty supply of Hawaiian specimens available in most herbaria 

 often makes a proper interpretation of the various endemic forms 

 practically impossible at the present day. 



In 1 91 7, almost in despair of being able to arrive at satisfactory 

 opinions respecting several Hawaiian species of Bidens, I appealed 

 to certain botanists resident there for aid. One of these, Professor 

 Charles N. Forbes, Curator of Botany at the Bernice Pauahi 

 Bishop Museum in Honolulu, proved able to render me assistance 

 of the utmost value. In 1919 he placed at my complete disposal 

 the entire Bidens collection of the Bishop Herbarium, also a set 

 of duplicates (later deposited in Field Museum, Chicago). Among 

 these were specimens not only by Hillebrand, Mann and Brigham, 

 and other older collectors, but also by Forbes, Bryan, Stokes, 

 and others of the present century. A considerable portion had 



but which clearly is a mere form of Bidens micrantha Gaud. A specimen of Remy 281 

 in Gray Herbarium had been erroneously determined by Asa Gray as being Bidens 

 sandvicensis Less. var. heterophylla Gray. Later, Hilleurand {loc. cit., 216), having 

 seen this sheet at Gray Herbarium and assuming Gray's determination to be correct, 

 naturally equated Gray's B. sandvicensis var. heterophylla with B. micrantha Gaud. 

 But the true B. safidvicensis Less. var. heterophylla Gray was based upon a plant in 

 Kew Herbarium collected by Beeciiey on the Island of Oahu, and treated by Hooker 

 and Arnott as Bidens luxurious. This plant of Beechey's is wholly distinct from 

 B. micrantha Gaud, and from our B. Rcniyi. 



