RYDBERG: SOME SENECIOID GENERA—I 49% 
of which were well founded. Psacalium is a very natural genus, 
just as well distinguished from Cacalia as understood by Gray 
as it is from Senecio, by the style which is practically Vernonioid, 
i. e., the branches are filiform, elongate, spirally curved, acute, 
neither truncate nor with a hair-pencil at the end. The same 
kind of style is found in Gynura and in some segregates of 
Liaburn. The genus differs from Senecio in the white or whitish 
corollas, with a long slender tube, a short broadly campanulate 
throat and elongate lobes, several times as long as the throat. 
The heads are always discoid, as in so-called Cacalia, and the 
basal leaves always with peltate blades. The latter character 
is not found in any of the other genera, included in Cacalia. 
‘It is found, however, in a group of species still included in 
Senecio, but these species have radiate heads, short corolla lobes 
and truncate style-tips with a terminal pencil. 
Bracts decidedly pubescent or puberulent. 
Leaf-blades deeply cleft, the divisions again lobed 
or coarsely toothed. 
Achenes tomentulose; heads nodding; leaves of 
ae giererited of = busapenernd linear-filiform. 1. P. Holwayanum. 
; leaves of the 
jnfloresdedice Talcecie or subulat 
Heads few; involucral bracts 12-16, eae 
villous, 12-18 mm. long. 
Stem and leaves decidedly pubescent. 
Heads 20-40-flowered; bracts a diab mm. 
di 7 isions of t 
usually 5-lo hed, 2. P. Conzattii. 
Heads 12~20-flowered; bracts about 12 
mm. long; primary divisions of the basal 
leaves 3-lobed. 3. P. Coulteri. 
Stem and leaves glabrous. 4. P. thyrsoideum. 
Heads numerous; involucral bracts 5-8, short- 
hirsute, about 10 mm. long or less. 
Bracts 8-10, about 10 mm. long; flowers 8-12. 
Ultimate lobes of the basal leaves rounded, 
obtuse, mucronate. 5. P. peltatum. 
Tias ems Fy | yams Sheath bb at 
1 » es 
: acute. 6. P. argutum. 
Bracts 5 or 6, usually less than 10 mm. long, 
6 
Involucre 8-10 mm. long; bracts ovate- 
oblong; lobes of the basal leaves acute.. 7. P. megaphyllum. 
Involucre 5-6 mm. long; bracts oblong; 
lobes of the basal leaves rounded, obtuse 
and mucronate. 8. P. obtusilobum. 
