108 Contributions from the Gray Herbarium 
glabrous, 2.9 mm. long, 1 mm. wide. Keel 2.3 mm. long; crest 
about 4-lobed on each side. Upper petals oblong, rounded at apex, 
subequal to keel. Capsule oval-oblong, the upper cell slightly the 
longer, narrowly winged, the lower wingless, scarcely dehiscent, 
2.7-3 mm. 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 linear lobes entire, scarious, appressed. — HBK.! Nov. Gen. v. 
399 (1821); Chod. Monog. ii. 282. t. 26. f. 3-5 (1893); of other 
auth. only in part. P. flagellaria Pavon! and P. filiformis Pavon 
ex Chod. I. ¢., as syn. — VERA Cruz: Valley of Cordova, 12 Dec. 
1865, Bourgeaw 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- 
pland (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. micnoacana Rob. & Seaton. Similar in habit, pubes- 
cence, and leaves; leaves up to 1.5mm. 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 2mm. 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 Luts Potosi: 1830-2440 
m., 1878, Parry & Palmer 45 (G). Hipauco: Cerro Ventoso above 
Pachuca, 2650 m., 18 Aug. 1898, Pringle 6968 (BGK). MicHoa- 
CAN: amongst pines, hills of Patzcuaro, 7 Aug. 1892, Pringle 4151 
(ryPE coLL.: BGK). Mexico: prairies, Flor de Maria, 31 July 
1890, Pringle 3618 (G). Pursita: Mt. Orizaba, 2745 m., 9 Aug. 
1891, Seaton ee sae Esperanza, Sept. 1911, Purpus 5705 (BG). 
—T.2. Fig. 
