‘ 
t9t7] SHERFF—BIDENS 25 
6 mm. longa; interiora nigra (nisi ad apicem), elongata, glabra 
aut supra remote hispida, 9-14 mm. longa. 
Barber and Townsend, Sierra Madre, Chihuahua, Mexico, July 17, 1899 
(type in U.S. Nat. Herb., herb. no. 663169). The nearest known ally of this 
species is Bidens tenuisecta Gray, a plant with a less branched and less delicate 
habit, wider leaf divisions, and more hispid involucre. I have seen only the 
type specimen. 
Bidens carpodonta, sp. nov.—Herba annua, erecta, 3-6 dm. 
alta; caule et ramis tetragonis, striatis, subglabris. Folia opposita, 
petiolata, petiolo adjecto 2-7 cm. longa, remotissime hispida, 
bi- aut tripinnata, ultimis segmentis linearibus, integris, o.5-1.5 
(raro 2.5) mm. latis, ad apicem acutis; petiolis ciliatis, basi con- 
natis, 0.1-1.5 cm. longis. Capitula terminalia, ligulata, tenuiter 
pedunculata, pedunculis 3-10 cm. longis, ad anthesin ligulis 
adjectis 1.5-2.5 cm. lata et o.6-1 cm. alta, in fructu.o.7-1 cm. 
lata et o.8-1.2 cm. alta. Involucrum basi setoso-hispidum, 
squamis duplici serie dispositis; exterioribus (6-8) linearibus, 
_ hispido-ciliatis, indurato-apiculatis, 3-5 mm. longis; interioribus 
lanceolatis, margine diaphanis, glabris, paulo longiorib us. Ligulae 
(circ. 5) flavae, ovatae, 12-15-striatae, apice 2-3-dentatae, o.8-r cm. 
longae. Paleae lineares, striatae, marge teeapeae demum 5-8 
mm.longae. Achaenia linearia, t edam exteriora sub- 
fusca, dense tuberculata, apice exaristato sed ad circumferentiam 
minute spinuloso-dentato, 4—6 mm. lo 
subsparsim tuberculato-hispida, demum elongata et o. S-1 cm. 
longa, raro biaristata aristis nudis aut retrorsum 1~3-hamosis, 
sed plurimum exaristata, apice pee ee 
circulo) coronato. 
De pL > ek. ee nr es al 
Coahuila, Mexico, September ara, 1904 ene in | Herb. NY. Bot. Gard). 
Differs from B. procera Don in having ach 
oe tert. 
es ore aes ee From B. se Sosiaigons 
