372 RYDBERG: SOME SENECIOID GENERA—1 
Leaf-blades sinuately lobed, the lobes broadly tri- 
angular, cle denticulate; achenes hirsute; 
involucre puberulent. 14. P. Langlassei. 
Bracts glabrous or slightly puberulent. 
Basal leaf-blades divided to near the center into 
lance-linear divisions. 9. P. peltigerum. 
Basal leaf-blades lobed tell to the center or less 
deeply into broad division 
Leaf-blades divided tiesto to the center; di- 
visions again lobed. 10. P. Nelsontt. 
Leaf- ene usually divided less than half-way to 
middle; divisions toothed or denticulate. 
faflorescence cymose- Sy peers bracts yellow- 
btuse or rounded at t 
Inflorescence elongate- aniculate; bracts more 
or less purplish, acute or a 
Basal leaf-blades 1.5-2.5 isin m. broad; lobes 
about 7, ovate, acute; inflorescence with 
many heads; leaves of the branches of 
. P. poculiferum. 
al 
— 
the panicle subulate 12. P. tabulare. 
Basal leaf-blades less than 1 cm. broad; lobes 
not more than 5; leaves of the inflorescence 
foliaceous. 13. P. laxtflorum. 
1. Psacalium Holwayanum (B. L. Robinson) Rydb. 
Cacalia Holwayana B. L. Robinson, Proc. Am. Acad. 43: 45. 
1907 
This is characterized by its tomentose achenes and nodding 
heads, and by the leaves of the inflorescence, which are linear- 
filiform. The type came from Uruapan, Michoacén. 
MicuoacAn: Holway 3617 (type); Pringle 13207, 13672; 
Langlassé 576.* 
2. Psacalium Conzattii (Rob. & Greenm.) Rydb. n. sp. 
Cacalia peltata Conzattii Rob. & Greenm. Proc. Am. Acad. 
32: 49. 1896. 
This was described as a variety of C. peliaia but is distin- 
guished by its few large heads with 12-16 bracts and 20-40 
flowers. It is more closely related to the next, differing in its 
larger heads, longer bracts, more flowers, and by its more lobed 
leaves. The type came from San Filipe, Oaxaca. 
Oaxaca: Pringle 6238; Conzaiti 27. 
* This might have come from Guerrero. 
