228 
In conclusion I wish to acknowledge my indebtedness to Dr. 
F. H. Knowlton of the United States Geological Survey for criti- 
cisms and references in nomenclature and synonomy. 
A Preliminary List of the North American Species of Malpighiaceae 
. and Zygophyllaceae. 
By ANNA Murray VAIL. 
MALPIGHIACEAE. 
1. JANUSIA A. Juss. Monog. Malp. 349. p/. 27. 1843. 
JANuSIA GRACILIS A. Gray, Pl. Wright. 1: 37. 1852. 
Distr. Arizona, New Mexico, Texas and Mexico. 
2. ASPICARPA Rich. in Mem. Mus. Par. 2: 398. fl. 7. 1815. 
1. ASPICARPA HYSSOPIFOLIA A. Gray, Bost. Journ. Nat. Hist. 6: 
167. 1850. 
Distr. Téxas, New Mexico and North Mexico. 
2. ASPICARPA LONGIPES A. Gray, Pl. Wright. 1: 37. 1852. 
Distr. Texas, New Mexico, southern Arizona and North 
Mexico, 
Very close to A. humilis (Benth.), from which it differs mainly 
in its trailing, and decumbent habit and somewhat larger leaves.* 
3. THRYALLIS L. Sp. Pl. Ed. 2, 554. 1763..Not Thryallis 
) Mart. Nov. Gen. 3: 77. pd. 230, 2317. 1829. 
THRYALLIS ANGUSTIFOLIA (Benth.) Kuntze, Rev. Gen. Pl. 89. 1891. 
 Galphimia angustifolia Benth. Bot. Sulph. 9. 1844. 
_ Galphimia linifolia A. Gray, Bost. Journ. Nat. Hist. 6: 166. 
1850. 
Distr. Western Texas to New Mexico, Lower California and 
Mexico. 
_ Very variable. The broader leaved form is 
THRYALLIS ANGUSTIFOLIA OBLONGIFOLIA, (A. Gray.) 
Galphimia linifolia 3 oblongifolia A. Gray, Pl. Wright. 1: 36 
1852. It is found with the type and may possibly be a species. 
* Aspicarpa Hartwegiana A, Juss. Arch. Mus, Par. 3: 598. 1843, is a synonym 
of Gaudichaudia humilis Benth. Pl. Hartw. 6. 1839, fde Kew Index. 
