232 NORTH AMERICAN FLORA [VoLuME 22 
3. Crossosoma glaucum Small, sp. nov. 
Shrub, with irregularly branched stems, less spines centthan C. Bigelovii, the bark of 
the twigs dark-gray ; leaf-blades mainly oval or ovate, or sometimes obovate, mostly 0.5-1 
cm. long or sometimes slightly larger, obtuse or mucronulate, glaucous, rather abruptly 
narrowed at the base; flowers short-pedicelled ; hypanthinum about 3 mm. wide at maturity ; 
sepals suborbicular, 4-5 mm. long; petals white, spatulate, 9-11 mm. long; follicles 7-9 
mm. long, the bodies ovoid, reticulate, stout-stipitate, each terminating in a stout beak ; 
seeds about 2 mm. in diameter. 
Type collected in the Hassayampa River Valley, Arizona, 1876, &. Palmer 560. 
DISTRIBUTION: Known only from the type locality. 
4. Crossosoma parviflorum Rob. & Fern. Proc. Am. 
Acad. 30: 114. 1894. 
Shrub, with many slender, usually elongate branches, the bark of the twigs gray ; leaf- 
blades oblong to elliptic, 8-13 mm. long, mostly acute, pale-green on both sides, rather 
abruptly narrowed at the base; flowers short-pedicelled ; hypanthium about 2 mm. wide at 
maturity; sepals broad or suborbicular, 1.5-2.5 mm. long; petals white, oblong or some- 
what narrowed at the base, about 6mm. long; follicles 6-7 mm. long, the bodies ovoid- 
reticulate, green, each terminating in a minute beak; seeds not seen. 
TYPE LOCALITY : Grand Cafion of the Colorado River, Arizona. 
DISTRIBUTION : Arizona and Sonora. 
