108 Contributions from the Gray Herbarium 



glabrous, 2.9 nun. long, 1 nun. wide. Keel 2.3 nun. long; crest 

 about 4-lobed on each side. Upper petals oblong, rounded at apex, 

 Bubequal to keel. Capsule oval-oblong, the upper cell slightly the 

 longer, narrowly winged, the lower wingless, scarcely dehiscent, 

 2.7-3 nun. long, 1.5-1.6 mm. wide. Seed cylindric, shortly pilosu- 

 lous, 2.2-2.5 mm. long. Aril 1.5 mm. long, with minute umbo, the 

 2 lineai- lobes entire, scarious, appressecl. HBK.! Nov. Gen. v. 

 399 (1821); (nod. Monog. ii. 282. t. 26. f. 3-5 (1893); of other 

 auth. only in part. P. flagellaria Pavon! and P. filijormis Pa von 

 ex Chod. 1. c.j as syn. Vera Cruz: Valley of Cordova, 12 Dec. 

 1865, Bourgeau 1518 p.p. (G). Mexico: Tacubaya, Valley of 

 Mexico, 27 May 1865, Bourgeau 60 (GK); Valley of Mexico, 

 Schaffner 32 (GK), 37 (K) ; near City of Mexico, Humboldt & Bon- 

 plana 1 (fragm. of type: G). T. 2. Fig. 82. Nearly all the material 

 that has been distributed as P. scoparia proves on close study to be 

 referable to P. scoparioides Chod. (no. 130). True P. scoparia, very 

 similar in aspect to P. scoparioides but with leaves not sulcate be- 

 neath, narrower wings, and short capsule equalling or barely ex- 

 ceeding the wings, appears to be confined to the Valley of Mexico 

 so far as known at present. All the United States material referred 

 to P. scoparia is P. scoparioides. The root is used officinally by the 

 Mexicans, according to Schaffner. 



134. P. michoacana Rob. & Seaton. Similar in habit, pubes- 

 cence, and leaves ; leaves up to 1.5 mm. wide. Raceme 0.7-4.2 cm. 

 long, loosely or densely flowered; flowers colored as in the last. 

 Sepals ovate, acutish, 1 mm. long. Wings cuneate-obovate, obtuse, 

 2.5 mm. long, 1 mm. wide. Keel 2 mm. long. Capsule suborbicu- 

 lar, 2-2.5 mm. long, 1.5-1.8 mm. wide. Seed (of both cells the 

 same) 1.7-2 mm. long, short-pilose. Aril 1.2-1.8 mm. long, the 

 lobes linear-oblong, scarious, appressed. Rob. & Seaton! Proc. 

 Am. Acad, xxviii. 103 (1893); Chod. Bull. Herb. Boiss. iv. 901 

 (1896), as syn. P. scoparia HBK. San Luis Potosi: 1830-2440 

 m., 1878, Parry & Palmer 45 (G). Hidalgo: Cerro Ventoso above 

 Pachuca, 2650 m., 18 Aug. 1898, Pringle 6968 (BGK). Michoa- 

 can: amongst pines, hills of Patzcuaro, 7 Aug. 1892, Pringle 4151 

 (type coll.: BGK). Mexico: prairies, Flor de Maria, 31 July 



1890, Pringle 3618 (G). Puebla: Mt. Orizaba, 2745 m., 9 Aug. 



1891, Seaton 508 (G); Esperanza, Sept. 1911, Purpus 5705 (BG). 

 T. 2. Fig. 84. 



