Piper — Some Western Species of Lathyrus. 195 



lected in the San Miguelito Mts., San Luis Potosi, Mexico, by Schaffner. 

 There are 10 sheets from Mexico in the National Herbarium which agree 

 closely with the original description. The Mexican specimens are all 

 rather tall plants with well developed tendrils, oval to ovate, acute or 

 obtuse leaflets, and resemble L. pauciflorus very closely, but the flowers are 

 nearly always slightly smaller, namely 12-18 mm. long, except in Pringle's 

 specimen from Melepec, which has flowers 20 mm. long. Most of the 

 Arizona and California specimens are dwarfed, being usually 15-25 cm. 

 high with the leaflets mostly oval usually acute and the flowers 12-15 mm. 

 long. Similar dwarfed specimens from as far north as Oregon, Klamath 

 Falls, Applegate No. 2050, and Washington, Wenache Mts., Cotton No. 

 1275, agree well with the Arizona plants, but there seems every reason to 

 believe that they are merely starved plants of L. pauciflorus, as dwarfing 

 in other species also affects the size of the corolla. In the absence of any 

 other distinguishing character, it seems most logical to reduce L. schaffneri 

 to subspecific rank. 



The following specimens are in the National Herbarium: 

 Mexico: Cerro Verde, Oaxaca, Purpus No. 3226; 



Melepec, Hidalgo, Pringle No. 8818; 



Pachuca, Hidalgo, Pringle No. 7640; 



San Luis Potosi, /. G. Schaffner No. 608; Parry & Palmer 

 No. 197; 



Chuichupa, Chihuahua, Barber & Townsend, July 17, 1899; 



State of Durango, Rose No. 2335; 



El Oro to Guanacevi, Durango, Nelson No. 4742; 



Cerro de Chicamole, Puebla, Purpus No. 3893; 



Alvarez, San Luis Potosi, Palmer No. 66. 



The last three specimens have the leaflets broad and 



obtuse, thus resembling utahensis. 

 Arizona: Massatzal Mts., Dr. Smart No. 175; 



San Francisco Mts., MacDougal, June 1891; 



Without locality, Palmer in 1869. 

 New Mexico: Carrizo Mts., Dr. W. Matthews in 1892. 

 Colorado: Without locality, Eastwood No. 4; 



Clear Creek, Wolf No. 187. 

 California: Oro Fino, Sisykou Co., Butler No. 1212; 



Water Canon, Tehachapi Mts., Kern Co., Abrams & Mc- 

 Gregor No. 443, both narrow, and broad-leafed forms 

 on same sheet; the narrow-leaved plants match well 

 the type collection of L. brownii. 

 Lower California: Without locality, Palmer No. 89 in 1888. 



Lathyrus pauciflorus brownii, n. comb. 

 L. brownii Eastw. Bui. Torr. Bot. CI. 30: 491. 1903. 



This plant closely simulates tenuior, but the flowers are smaller and the 

 leaflets even more variable. On small plants, as some of those of the type 

 collection, the tendrils are simple and much reduced. 



