208 Plants from Sinaloa, Mexico. [ZOE 
Euphorbia (Cyt/arospermum) Humayensis. Annual, freely 
branching, 3-4 dm. high, slightly pubescent, glandular about the 
ends of the branches; leaves nearly as broad as long, rounded at 
the tip, cuneate at base, slightly setulose on both surfaces, paler 
beneath, the larger 3 cm. long on much longer petioles; flowers 
solitary in the axils on pedicels 4 mm. long and less; involucres 
small, turbinate, setulose, lobes linear, lacerate; glands 5; 
appendages 0.25 mm. long, light green, entire; styles distinct 
and divided to the base; capsule glabrous, its stipe 2 mm. long: 
seeds orbicular, with numerous, acute-margined, crater-like pits. 
This species was collected at Culiacan, on Cerro Colorado and 
in the foot-hills near Todos Santos of the Cape Region of Baja 
California. In general appearance it resembles Z. delicatula 
Boiss., which is not glandular, has subpeltate leaves and is 
. different in other respects. The Baja California specimens have 
larger leaves. 
Euphorbia (Zygophyllidium) Sinaloensis. Annual, 1 m. high 
and less, much branched, glabrous throughout; leaves thin in 
texture, paler beneath, broadly ovate, obtusely pointed, cuneate 
at base, the largest 2 cm. wide, 3-5 cm. long; petioles 4 cm. 
long; flowers solitary or rarely two from the axils on pedicels 4 
mm. long and less; lobes of the involucre quadrate, slightly 
fimbriate, white; glands 5, orbicular; appendages clear white, 2 
mm. long, oblong, entire or slightly undulate; styles united near 
the base and divided half their length; capsule on a stipe 5 mm. 
long; seeds obtusely 6-angled, pointed at the top, granular- 
roughened, crenate on the angles. 
A handsome delicate species from Cerro Colorado. The clear 
white appendages to the glands render it very conspicuous. 
Euphorbia dioscorioides Boiss. Culiacan. 
Euphorbia Francoana Boiss. Cofradia. 
Euphorbia Colime Rose. <A form with larger leaves and — 
smaller bracts. Culiacan and Cofradia. 
Euphorbia subreniforme Watson. Cofradia. 
Euphorbia Californica Benth. Culiacan. 
Euphorbia florida Englm. Involucre and appendages bright 
violet. Cofradia There are traces of this color in Dr. Palmer’s 
