STUDIES IN THE GENUS BIDENS. Ill 



CONTRIBUTIONS FROM THE HULL BOTANICAL LABORATORY 216 



Earl E. Sherff 



(WITH PLATE XXXl) 



Bidens attenuata, sp. nov. — Herba (annua?), +4 dm. alta; 

 caule et ramis hispido-tomcntosis, subtenuibus, subperspicue stria- 

 tis, teretis (nisi caule infra angulato). Folia opposita (aut superiora 

 altcrnata), petiolata, petiolo adjecto 1.5-6 cm. longa, bi- aut tri- 

 (aut etiam quadri-) pinnata, subsparsim adpresso-hispida, hispido- 

 ciliata; ultimis lobulis intcgris, linearibus, indurato-apiculatis, 

 saepe convolutis, 0.3-0. 7 mm. latis. Petioli 3— n mm. longi, his- 

 pidi, ad basim connati. Capitula terminalia, ligulata, longe et 

 tenuiter pedunculata, pedunculis 5-15 cm. longis. Involucrum 

 basi hispidum; squamis duplici serie dispositis; exterioribus 

 (circ. 6) linearibus, glabratis aut sparsim hispidis, 3-4 mm. longis; 

 interioribus dimidio longioribus, dense hispidis, margine diaphanis. 

 Ligulae flavae, striatae, elliptico-ovatae, ad apicem subdentatae aut 

 integrae, 1.8-2 cm. longa. Paleae lineares, margine diaphanis. 

 Achaenia (submatura) linearia, glabra, costata, biaristata aristis 

 retrorsum hamosis (3-6 glochidiis), 5 mm. longa. 



Ghiesbrccht, Chiapas, Mexico (type in Herb. Gray). 



Asa Gray had labeled this plant in the herbarium "B. fertdaefolia var.," 

 but the true Bidens feridaefolia DC. (Coreopsis fcrulacfolia] acq., Hort. Schoenb. 

 3:65. pi. 375. 1798) is a very different plant. 



Bidens Andrei, sp. nov. — Herba (ad basim suffrutescens ?) , 

 1-2 m. alta, glabrata, caule tetragono et striato; ramis tetragonis, 

 striatis, (superioribus) irregulariter arcuatis et in nonnullos ramulos 

 (aut pedunculos) divisis. Folia opposita, petiolata, petiolo adjecto 

 2.5-7 cm - longa, bi- aut tri- (aut quadri-) pinnata, supra minute et 

 non dense adpresso-hispida ; ultimis segmentis linearibus, integris 

 aut lobulatis, indurato-apiculatis. Petioli 0.3-2 cm. longi, basi 

 connati. Capitula multa, tenuiter pedunculata, pedunculis 

 4-12 cm. longis, 0.4 cm. (ad anthesin) -1 cm. (in fructu) 

 495] IBotanical Gazette, vol. 61 



