104 BOTANICAL GAZETTE [august 



reflexae, circ. 1.5 mm. longac, interioribus paulo longioribus. 



Ligulae circ. 5, flavidae, anguste oblongo-obovatae, apice valde 



acritcrque 2-dentatae, 6-8 mm. longac. Unum achaenium matu- 



rum visum nigrum, valde arcuatum et tortum, glabrum, cxalatum, 



exaristatum, circ. 1 cm. longum; achacniis immaturissimis bi- 



aristatis, aristis retrorsum 1-2-hamosis. 



Specimens examined. — C. N. Forbes 82 K, Waioli Valley. Kauai, July 23, 

 1909 (Herb. Bishop Mus., two type sheets). 



Bidens waianensis, sp. nov. — Frutex glaber, supra ramosus, 

 verisimiliter 5-8 dm. altus. Folia gracilia, pinnata aut plus 

 minusve bipinnata, petiolis adjectis 4-12 cm. longa et 3-6 cm. 

 lata, foliolis primariis lanceolatis serratis acuminatis aut iterum 

 pinnatis lobis ultimis linearibus integris ad apicem acriter mucro- 

 natis, petiolis tenuissime 2-4 cm. longis. Capitula multa, corym- 

 bosa aut corymboso-paniculata, ad anthesin circ. 6 mm. alta et 

 1 .5-2 cm. lata, breviter supra folia exserta, floribus 15-25. Invo- 

 lucri bracteae exteriores circ. 6, lineares, glabratae aut sparsim 

 glanduloso-pulverulentae, ad apicem subacutae, 1-2 mm. longae, 

 quam bracteae interiores dimidio breviores. Ligulae circ. 5, 

 flavidae, oblongo-oblanceolatae, ad apicem obtusae, circ. 1 cm. 

 longae. Achaenia nigra, valde torta, glabra aut versus apicem 

 remote setosa, exalata matura exaristata et 6-10 mm. longa. 



Specimens examined. — C. N. Forbes 2023 O, Kolekolc Pass, Waianae 

 Range, Oahu, February 1 and 2, 1915 (Herb. Field Mus., no. 485291, type; 

 Herb. Bishop Mus., a form with leaflets much broader than in the type 

 specimen); U.S. S. Pacif. Expl. Exped. (under Captain Wilkes), Kaala Moun- 

 tains, Waianae Range, Oahu, 1838-1842 (Herb. Bishop Mus.; Herb. New 

 York Bot. Card., two sheets); /. F. G. Stokes, Kolekolc Pass, Waianae Range, 

 Oahu, in 1915 (Herb. Bishop Mus.). 



Asa Gray had determined the specimens collected under Captain Wilkes 

 as being Bidens micrantha Gaud. (Coreopsis micrantha Gray). Later, in dis- 

 cussing Bidens micrantha (Proc. Amer. Acad. 5:127. 1862), he said: "Sand- 

 wich Islands, especially Oahu. Variable in the foliage, which is commonly 

 more dissected than in Gaudichaud's figure." Clearly Gray had in mind the 

 Wilkes plants, collected in the Waianae Range on Oahu. A study of the more 

 recent specimens by Forbes and by Stokes, collected in the same immediate 

 locality, shows the identical peculiarities of foliage. Furthermore, the floral 

 and achenial characters are seen to be very distinct from those of the more 

 widely distributed Bidens micrantha, which occurs not only on Oahu but also 

 on Hawaii, Maui, and Lanai. 



