_ the type species of that genus (Cosmos 
1917] SHERFF—BIDENS 27 
conspicuous, averaging } to 3 the length of the achene body, and are armed 
with many retrorse barbs that are not deciduous. Many other characters 
likewise are pronounced, making it seem best, therefore, to give herewith a 
full specific description, drawn from the type and various cotypes examined. 
BIDENS AEQUISQUAMA, descript. amplificat——Herba, +5 dm 
alta; caule ramisque pubescentibus aut subglabris, quadrangulari- 
bus, striatis. Folia opposita, petiolata, petiolo adjecto 3-8.5 cm. 
longa, indivisa aut tripartita, ciliata, supra subglabra, infra sparsim 
adpresso-hispida et pallidiora; indivisis foliis lanceolatis, subcrasse 
setratis; foliolis foliorum tripartitorum similiter serratis, terminali- 
bus ovatis aut lanceolatis, lateralibus ovatis et subsessilibus et 
minoribus; petiolis o.4—1.8 cm. longis, hispidis, ad basim connatis. 
Capitula terminalia, ligulata, pedunculata, pedunculis 1-6 cm. 
longis et ad apicem creberrime albido-pubescentibus. Involucrum 
basi hispidum; squamis duplici serie dispositis; exterioribus (9-16) 
linearibus, hispidis, 2-4 mm. longis; interioribus subaequalibus, 
lanceolatis, glabris aut ad apicem et longitudinaliter medio hispidis , 
margine diaphanis. Ligulae (circ. 8) roseae, striatae, apice irregu- 
lariter 2-4-dentatae, 9-11 mm. longae, 6-8 mm. latae. Paleae 
lineares, margine diaphanae, 4-6 mm. longae. Achaenia nigra, 
linearia, ad apicem plus minusve hispida, biaristata, aristis non 
adjectis 4.5-7 mm. longa, flavis aristis retrorsum hamosis et 
2.5-3 mm. longis. 
“BIDENS SEEMANNIL”’ Seis. Bip ex Seem. Bot. Herald 307. 
1852-57; Cosmos Seemannii Gray, Proc. Amer. Acad. 19: 16. 
1883. 
SCHULTZ ees beli 
of separate treatment and accordingly Je united it with Bidens. 
s ok 
d th ey tu unworthy 
But since his time, | — of the Compositae have per- as 
sisted very uniformly in recognizing Cosmos as a distinct genus — 
_ (cf. GREENE, Pittonia 4: 245. eon Indeed, the characters of : 
ee 
s Cav.) areso 
4 Sree ice ke 6 ay went ak Senn Boe | 
: __Bxos’ view wil ever be accepted by botanists inthe future. This. 
