io6 



BOTANICAL GAZETTE 



[august 



the species to a variety of Bidens macrocarpa, but Nuttall's type 

 is not even remotely matched by the type material (Herb. U.S. Nat. 

 Mus.; Herb. N.Y. Bot. Gard.; Herb. Gray) of B. macrocarpa. It 

 is, however, the same as Mann and Brig ham 98, distributed to vari- 

 ous herbaria as B. hawaiensis. B. hawaiensis is a much coarser 

 plant and differs in many characters from B. gracilis. From all 

 other species of the Hawaiian Islands B. gracilis is sharply distinct. 

 From the several specimens studied, I have drawn up the follow- 

 ing amplified description: 



Bidens gracilis Nutt., descript. amplificat. (pi. XIII) . — Frutex 

 gracilis, glabra, ramosa ramis rubescentibus, verisimiliter 6-9 dm. 

 alta. Folia plerumque serrata aut etiam laciniato-dentata, 

 acuminata; nunc indivisa et ovata aut lanceolata, petiolis adjectis 

 3-7 . 5 cm. longa et 1-2 cm. lata; nunc tripartita, foliolis lanceolatis, 

 foliolo terminali 4-5 cm. longo et 1-1 . 5 cm. lato, lateralibus dimidio 

 minora; petiolis tenuibus, 1-2 cm. longis. Capitula parva, panicu- 

 lata paniculis trichotomis, ligulata, ad anthesin 6-7 mm. alta et 

 circ. 1 cm. lata, pedunculis gracilibus o . 5-2 . 5 cm. longis. Involucri 

 bracteae exteriores lineares, patulae, supra subglandulosae, interi- 

 oribus adpressis fere dimidio breviores. Ligulae circ. 5, lanceolatae, 

 flavae, ad apicem dentatae, 3-6 mm. longae. Achaenia torta, 

 linearia, corpore =*= 8 mm. longa, facie et marginibus glabra aut 

 sparsissime hispida, apice setuloso-ciliata,nunc brevissime biaristata 

 aristis 0.3-0.8 mm. longis et glabris aut versus apicem retrorsum 

 hispidulis, nunc uniaristata aut etiam exaristata, saepe omnibus 

 tribus formis in eodem capitulo. 



Specimens examined. — Thos. Nuttall, Oahu (Herb. Brit. Mus., type); 



* 



Mann and Brigham 98, Oahu (Herb. Bishop Mus.; Herb. Cornell Univ.; 

 Herb. Field Mus.); C. N. Forbes 1184O, Moanalua Valley, Oahu, March 9, 

 1909 (Herb. Bishop Mus.). 



Bidens micrantha Gaud. Voy. Freycinet Bot. 464. pi. 85. 



1826-1829 



py 



micrantha Cass. Diet. Sci. 51:475. 



1827; Coreopsis micrantha Gray, Proc. Amer 

 Bidens Remyi Drake del Cast. Illustr. Fl. In 

 1888; Coreopsis Remyi Dr9,ke del Cast., loc. cu 



1861; 



Mar. Pacif. pi 



The identity 



with most authors. 



matter 

 assumed 







