198 Plants from Sinaloa, Mexico. [ZoR 
growth of the present year: capsule ovate-acuminate, 2-valved, 7 
mm. long, opening in September. Common along the Culiacan, 
Humaya and Tamazula Rivers. 
The young trees bearing only linear leaves resemble willows, 
and until I saw older trees bearing also deltoid leaves was it cer- 
tain that they belonged to Populus. ‘Trees that bear both sorts 
of foliage have numerous intermediate leaf forms. ‘The aments 
growing from the almost leafless part of the branches gives the 
fruiting tree an appearance different from a typical cottonwood. 
All other species of the genus bloom in the early part of the year 
and soon mature their fruit. The wood is very soft and is 
brought into Culiacan to be made into boards. Staminate aments 
and pistillate flowers were not seen. 
Okenia hypogea C. & S. Leaves with sinuate margins, sta- 
mens, 7, peduncles elongated to 15 cm. and more. Collected on 
sand dunes near Altata. 
Philoxerus vermicularis Moq. Growing on saline flats about 
Altata. 
Cleome Sinaloensis. Annual, 3-4 dm. high, much branched, 
viscid-pubescent, somewhat rough to the touch: petioles 1.5-2 
em. long; leaflets 3, broadly ovate-acuminate, 2.5 cm. long, 1.4 
cm. wide; bracts nearly sessile, glandular-pubescent: calyx lobes 
linear, 4 mm. long; petals a half longer, yellowish-white, spatu- 
late; stamens 6; pedicel of mature pod 2cm. long; stipe 3 mm. 
long; capsule torulose, pointed at both ends, glabrous, 4-—4.5 cm. 
long, 3 mm. wide; seeds muricate and finely striate, 2.5 mm. in 
diameter. Collected in the vicinity of Culiacan. 
Drymaria effusa Gray. Cofradia. Compared with the type 
by Dr. J. M. Greenman. 
Acacia crinita. A bush 4-5 m. high, the unarmed young 
branches and petioles villous-hirsute with white or yellowish 
hairs that are 4-5 mm. long; petiole with rachis of the leaf 5-6 
em. long; pinnz 2-3 pairs 4-10 cm, long: leaflets 4-8 pairs, ovate- 
oblong, the longer 23 mm. long, 14 mm. wide, obtuse or retuse, 
glabrous on both surfaces; stipules linear-lanceolate, 8 mm. long, 
ciliate; the oblong or globular heads on axillary peduncles 3-4 
cm. long; flowers white: stamens very numerous; fruit unknown. 
