376 RYDBERG: SOME SENECIOID GENERA—I 
14. Psacalium Langlassei Rydberg sp. nov. 
Stem 7.5 dm. high or more, sulcate, scabrous- puberulent, 
brownish ; basal ca long-petioled, the peti she 1-5 —2 dm. long 
both sides, 9-10- -ribbed, 9-15- -lobed; lobes’ Soman triangles 
broader than long, mucronulate-denticulate; leaves of the in- 
florescence Sikes or linear-filiform; heads in an elongate panicle; 
involucre 15-17 mm. high, and nearly as broad; bracts about 10, 
linear, acute, glandular-puberulent, acute; flowers 15-20; 
corolla-tube 8 mm. long; throat scarcely 1 mm. long; lobes 
inear, 3 mm. ea: achenes hirsute, 5 mm. gree pappus- - bristal 
white, 10 mm. 
Type og ae 5 in the Sierra Madre, Michoacan or Guerrero, 
1898, E. Langlasse 576 (U.S. Nat. Herb. no. 386047). 
The species resembles somewhat the last two in its leaf-form, 
but the heads are larger, like those of P. peltatum and its re- 
latives, the bracts about 10, puberulent, and the achenes are 
hirsute. It is known only from the type collection. 
CACALIA CALOTRICHA Blake, Contr. Gray Herb. II. 52: 
58. 1917. 
This should probably be referred to Senecio. 
PERICALIA Cass. Dict. Sci. Nat. 48: 459. 1827. 
This genus has the short corolla-lobes and the style-branches 
of Senecio, but the corollas are white or nearly so, the throat is 
elongate, narrowly funnelform, the lobes conspicuously rolled 
back after anthesis. The achenes are subcylindric, strongly 
10-ribbed, the pappus of barbellate white bristles, slightly 
clavate at the tip, and the leaves are palmately ribbed and 
lobed. 
Leaves sessile. 1. P. sessilifolia. 
Leaves petioled. 
Leaves of the infl i , foliaceous, ovate. 2. P. suffulta. 
Leaves of the inflorescence ieee or linear-filiform. 
Stem glabrous, leafy throughou 3. P. ovatifolia. 
Stem pubescent, leafy at the a only. 4. P. michoacana, 
1. Pericalia sessilifolia (H. & A.) Rydb. 
Cacalia sessifolia H. & A. Bot. Beechey Voy. 436. 1841. 
Schultz Bipontinus transferred it to Senecio under the name 
S. Beecheyanus. So did also Hemsley who, however, retained 
