158 



mens collected by Mr. Dodge near Monterey in 1891 (No, 131). Fig. 24, X. mnltiflora, 

 is made from the type specimen. Fig. 25, .V. laxior, is made from duplicate type. 

 Fig. 20, X nelsoni, is made from specimens collected by Mr. C. G. Priugle in the 

 valley of Oaxaca in 1891 (No. 4040). Fig. 27, N. fruticosa, is taken from Hooker's 

 Icones, vol. 6, No. 599. 



KEY TO NISSOLIA. 



a. Stems prostrate, creeping. 



Nissoiia wislizeni Gray, Jonrn. Linn. Soc. 5 : 25. 1861. Chaetocalyx wislizeni Gray, 



PI. Wright. 1 : 51. 1852. FIGURE 17. 



This species has a wide distribution, extending from Arizona and New Mexico to 



Central Mexico. I collected it in the States of Durango and Zacatecas in 1897, 



from which, so far as I can learn, this is the first time it has been reported. 



Specimen h examined — 

 United States: 



Arizona, Huachuca Mountains, September, 1882, ,/. (1. Lemmon (No. 2(168). 

 Now Mexico, , C. Wright, 1851 (No. 1007). 



7/ 



Flo. 17. — Xis.iolia wislizeni. 

 Mexico: 



State of Chihuahua, hills and plains near Chihuahua, C. (i. Pringle, June to 



August, 1885 (No. 618). * 



State of San Luis Potosi, chiefly in the region of San LuiB Potosi, 22 c north 



latitude, altitude 6,000 to 8,000 feet, C. C. Parry and Edward Palmer, 1878 



(No. 133). 

 State of Durango, J. N. Hose, August 14 and 15, 189/ (Nos. 2278 to 2298). 

 State of Zacatecas, near Monte Escobedo, ./. A r . Pose, August 27, 1897 (No. 



2651). 



aa. Stems climbing or twining. 



b. Flowers all in small rerticillate clusters. 



c. Style terminal; legume with the apex of wing acute or acutish. 



d. Calyx glabrous without, sometimes setose. 



Nissolia schottii (Torr.) Gray, Journ. Linn. Soc. 5:26. 1861. Chaeiocalyx schottii 

 Torr. Bot. Mex. Bound. 56, t. IS. 1859. Figure 18. 



The type was collected by Schott at " Sierra Verde, Arroyo de los Samotas, 

 Sonora." 



This species seems to be confined to northwestern Mexico, extending into southern 

 Arizona. Specimens so named from farther east are to be referred elsewhere. I 



