86 Contributions from the Gray Herbarium 



the cresl often purple, 2.5-3 nun. long. Upper sepal broadly 



ovate, obtuse, 1.5 nun. long, the lower oblong, 1.3 mm. long. 

 Wings obliquely elliptic, rounded at apex, shortly cuneate at base, 

 2.9 nam. long. 1.6 mm. wide. Keel 3 mm. long; crest of 4 pairs of 

 lobes, the posterior cuneate, the 3 anterior linear, entire. Upper 

 petals ovate, obtuse, 2.8 mm. long. Capsule elliptic or oblong- 

 elliptic 2.5-2.9 nun. long, 1.3-1.6 mm. wide. Seed appressed- 

 pilose, 2.3-2.5 mm. long. Aril (0.8) 1.3-1.5 mm. deep, its oblong 

 obtuse lobes appressed. Divisible into two varieties. 



Var. tenuifolia (Pursh), comb. nov. Folia omnia alterna (verti- 

 eillis 1-2 basalibus exceptis). P. Seneca var. y. tenuifolia Pursh, 

 Fl. Am. Sept. ii. 750 (1814). P. alba Nutt.! Gen. ii. 87 (1818); 

 Wats. Proc. Am. Acad. xxi. 416 (1886); Chod. Monog. ii. 135. t. 

 20. f. 13-14 (1893). P. bicolor HBK! Nov. Gen. v. 394. t. 507 

 (1821). P. alba Nutt. var. bicolor (HBK.) Chod. 1. c. 136 (1893). 

 P. Torreyi G. Don, Gen. Sys. i. 360 (1831); Greene, Pitt. hi. 307 

 (1898). P. Beyrichii T. & G. ! Fl. N. Am. i. 130 (1838). P. scoparia 

 Benth.! PI. Hartw. 8 (1839), not HBK. P. alba Nutt. var. brachy- 

 stachya Chod. ! 1. c. 136 (1893) ; var. leptostachya! and var. mexicana 

 Chod. I.e. 137. Sonora: Fronteras, 1390 m., 24 Sept. 1890, 

 Hartman 40 (G); Sept. 1851, Thurber 1092 (G). Chihuahua: 

 Santa Eulalia Mts., 27 Oct. 1885, Pringle 299 (type coll. of var. 

 brachystachya: BG) ; San Antonio de las Alanzanes, 1848-49, Gregg 

 371 (GK). Coahuila: Sierra Madre, 64 km. south of Saltillo, 

 July 1880, Palmer 68 (G). Durango: near City of Durango, 1896, 

 Palmer 129 (BG); Tejamen, Aug. 1906, Palmer 537 (G); Tepe- 

 huanes, Mar -Apr. 1906, Palmer 43 (G). Zacatecas: Coulter 725 

 (GK); Guadalcajar, 1883, Duges (G). Aguas Calientes: near 

 Picocho, Hartweg 30 (BGK). Guanajuato: Santa Rosa, Hum- 

 boldt & Bonpland (fragm. of type of P. bicolor: G). San Luis 

 Potosi: 1878, Parry & Palmer 39 p. p. (K). Puebla: San Luis 

 Tultitlanapa, June 1908, Purpus 3502 (G) ; Bagre, Minas de San 

 Rafael, May 1911, Purpus 5165 p. p. (G). Sierra Madre, Mexico: 

 Seemann (G: toward var. suspecta). Mexico without locality: 

 Beechey (K). T. 2. Fig. 61. 



Var. suspecta Wats. Folia usque ad mediam partem caulis ver- 

 ticillata. P. alba Nutt. var. (?) suspecta Wats. ! Proc. Am. Acad, 

 xxi. 416 (1886). P. alba var. Schaffneri Chod. Monog. ii. 137 (1893). 

 Chihuahua: 240 km. north of Batopilas, 1375 m., Nov. 1885, 



