VOL. 5] Plants from Sinaloa, Mexico. 225 
style branches and by some authors is referred to Laphamia on 
that account. 
Perityle saxosa. Many stems branching from an apparently 
perennial root, 4-5 dm. high, puberulent; leaves deltoid-acumi- 
nate, cuneate at base; the blade 2-3 cm. long, 1.5-2 cm. wide, 
atomiferous, about equalling the petiole: heads paniculate on 
peduncles 2-6 cm. long; rays white, 2-3 mm. long and half as 
broad: bracts of the involucre 4 mm. long, ovate-lanceolate: disk 
flowers numerous: akenes pubescent on both faces and from the 
same plant with or without callous margins, 2 mm. long: pappus 
two delicate awns, the larger half the length of the akene, the 
other absent or minute and a short crown of fimbriate scales. 
The character of having or. lacking callous margins to the 
akenes has always been considered a good one but this plant 
would seem to render such a distinction of doubtful value. The 
margins are always minutely ciliate. Growing on rocks of 
Cerro Colorado. 
Porophyllum quinqueflorum. Annual, 5-6 dm. high, 
branching above the middle; stems terete, somewhat striate: 
leaves thin in texture, alternate, cuneate at base and rounded at 
tip, 2-5 cm. long, 1-2 cm. wide; marginal glands 0-7; petioles 
filiform, 2-3 cm. long: heads 1.7 cm. long: peduncles from the 
axils of the leaves, very slightly thickened upward; involucral 
scales 5, linear-lanceolate, green, with a single row of linear 
glands: flowers ochroleucous, 9 mm. long: akenes 5, 8 mm. long. 
Growing in damp, dark ravines. Cerro Colorado. 
Pectis purpurea. Annual, 1-2 dm. high, branches ascending 
from near the base; stems angular, glabrous, purple: leaves 
linear-lanceolate, 3-4cm. long, 3-4 mm. wide, margins revolute, 
2-4 rows of large glands beneath, setiferous near the dentate base; 
inflorescence terminal and from the upper axils; peduncles 6-8 cm. 
long, with few bracts: involucre campanulate, 4-5 mm. high, purple; 
scales linear, slightly pubescent at the obtuse tip, bearing large, 
roundish glands and keeled near the base: rays about 8, linear, 
6 mm. long, purple on the back: disk flowers numerous: pappus 
minute, scales broad as long, sometimes slightly pointed, fim- 
briate: akenes pubescent. 
