Al4 RYDBERG: SOME SENECIOID GENERA—II 
3. Odontotrichum decompositum (A. Gray) Rydb. 
Cacalia decomposita A. Gray, Pl. Wright 2: 99. 1853. 
_ As stated above, this species has the general habit of the two 
preceding, but the style-tips of the rest of the genus. 
ARIZONA: Goodding 784; Blumer 1378; Mearns 2210, 527, 
531; Eggleston 10765; Palmer E. 
Cuinuanua: Pringle 767; Townsend & Barber 158; E. W. 
Nelson 6095. 
Sonora: Santa Cruz, Wright 1286 (type). 
Duranco: E. W. Nelson 4758. 
4. Odontotrichum filicifolium Rydb. sp. nov. 
Stem 4-5 dm. high, striate, slender, glabrous below, hirsute- 
puberulent above; basal leaves ong-petioled, the petioles 7-10 
: jab 
mm. broad, purplish, glabrous; bracts 5 to 6, oblong, membran- 
ous-margined, acute; flowers 5 or 6; corolla-tube 4 mm. long; 
lobes linear, about as long; achenes 4 mm. long, densely villous 
with yellowish white hairs; pappus-bristles light-brown, bar- 
bellate. 
Type collected between Santa Gertrudis and Santa Teresa, 
Tepic, August 8, 1897, J. N. Rose 2101 (U. S. Nat. Herb. no. 
301002). 
5. Odontotrichum platylepis (Rob. & Seaton) Rydb. 
Cacalia platylepis Rob. & Seaton, Proc. Am. Acad.28: 110. 1893. 
This and the next species are characterized by their large 
heads. 
JALisco: Pringle 1816, 9873; Rio Blanco, Palmer 689 (type); 
Safford 1432; Jory, in 1892. 
6. Odontotrichum paucicapitatum (Rob. & Greenm.) Rydb. 
Cacalia paucicapitata Rob. & Greenm., Am. Jour. Sci. III. 50: 
158. 1895. 
This is known only from the type collection, at Sierra 
Clavellinas, Oaxaca, Pringle 6018. 
