STUDIES IN THE GENUS BIDENS. II 
CONTRIBUTIONS FROM THE HULL BOTANICAL LABORATORY 201 
EArt E, SHERFF 
(WITH THREE FIGURES) 
Bidens acuticaulis, sp. nov.—Herba annua, tenerrima, 4-8 dm. 
alta; caule acute angulato, ramoso; ramis adscendentibus, acute 
angulatis et fere subalata, remote pubescentibus. Folia opposita, 
petiolata, petiolo adjecto 1-4 cm. longa, pinnata aut irregulariter 
bipinnata; foliolis (et lobis) linearibus, o. 5-1 mm. latis. Petioli 2-10 
mm. longi. Capitula multa, terminalia, 3-4 mm. alta et 2.5-3.5 
mm. lata (frutescentia demum 1-1.2 cm. alta et 4-5 mm. lata), 
ligulata. Involucrum basi pubescens; squamis duplici serie dis- 
pPositis; exterioribus linearibus, plus minusve pubescentibus, 3-4 
mm. longis; interioribus lanceolatis, marginibus diaphanis 1. 5—3 
mm. longis. Ligulae circiter 4, parvae, sub-flavidae aut fere albae, 
2- (4-) striatae, 3-5 mm. longae. Paleae lineare-lanceolatae, 
Striatae, marginibus diaphanis. Achaenia linearia, remotissime 
pubescentia, margine adscendente-ciliato, apice erecto-hispido 
et biaristato aristis retrorsum hamosis, 6-12 mm. longa. 
John Gossweiler 4052, in herb-grown woods, Angola, April 4, 1906. (type 
in Herb. Brit. Mus.). 
Bidens rufovenosa, sp. nov.—Herba erecta, perennis (?), 4-6 
dm. alta; caule subtereto, striato, glabro, plus minusve ramoso; 
tamis (aut ramulis) monocephalicis. Folia opposita, petiolata, 
petiolo adjecto 4-6 em. longa, pinnata, spinuloso-ciliata, supra 
Sparsim et brevissime spinuloso-pubescentia, infra sparsim pubes- 
centia et ad venas minute rufo-tomentosa;' foliolis lateralibus 
lanceolatis (aut foliorum superorum lineare-lanceolatis), incisis 
aut longe dentatis; foliis supremis integris et lanceolatis, aut ter- 
natis, foliolis integris et lanceolatis; petiolis basi connatis, foliorum 
* Dr. S. Eckerson, of the University of Chicago, has kindly made for me a critical 
examination of a beaf from the type, and she reports the color of the pubescence due 
to a red stain produced in the mucilage cells along the veins. 
301] [Botanical Gazette, vol. 59 
