RYDBERG: SOME SENECIOID GENERA—II 417 
gare on both sides; lower stem-leaves with shorter petioles, 
dilated at the base and more ovate blades; upper stem-leaves 
high, a 
oblong? ae thick on the back, with scarious margins; 
flowers 8-10; tube nearly 4 mm. long, lobes slightly longer, 
F ieaa achenes Stra striate; ‘pappus- -bristles white, about 
m. long; barbella 
ale collected in es Madre, Durango, August 13, 1897, 
J. N. Rose 3471 (U.S. Nat. Herb. no. 302448). 
19. Se amplum Rydberg, sp. nov. 
Stem stout, high, sulcate, glabrous; basal 
leaves one pet oe oe sete aboot 4 dm. long, sulcate; 
blades rounded sagittate-reniform, the mse from the apex 
to the basal sinus nearly 1.5 dm. and from the apex to the end 
of the basal lobes coats about 2.5 dm., the extreme width 2.5 
m., sinuate dentate, s . reticulate, thick, glabrous on 
both sides; lower s eis fea unknown, the upper ones sessile 
and _ half-clasping, one or pony strongly reticulate, entire at 
the base, dentate above; those of the inflorescence similar but 
smaller and less reticulate; heads many, in an ample nina 
form cyme, 30-flowered or more; involucre 12-13 mm. high, 
nearly 2 cm. broad, glabrous; bracts 15-20, broadly prot 
acute or obtuse; corolla-tube 9 . long; lobes linear, 5 mm. 
long; achenes glabrous; Cae white, 9 mm. long, 
scabrous. 
Type collected between Heujuquilla and Mesquitec, Jalisco, 
August 25, 1897, J. N. Rose 3575 (U.S. Nat. Herb. no. 302552 
and 302739 
20. Odontotrichum pachyphyllum (Schultz Bip.) Rydb. 
Cacalia pachyphylla Schultz Bip.; Seem. Voy. Herald 310. 1856. 
e type was collected in the Sierra Madre, in either Sinaloa 
or Durango, by Seemann. A specimen is in the Gray herbarium. 
No other has been seen. 
21. Odontotrichum Palmeri (Greene) Rydb. 
Cacalia Palmeri Greene, Pittonia 1: 219. 1888. 
The type locality is Rio Blanco, Jalisco. 
JALisco: Palmer 168, in 1886 type; Pringle 2304, 11500. 
MICHOACAN: Arséne 5112. 
