106 Contributions from the Gray Herbarium 
mucronate, more or less strongly 2-sulecate beneath, glabrous or 
nearly so, 7-14 mm. long, 0.6-1.3 mm. wide, on petioles 0.4 mm. 
long or less. Racemes up to 36-flowered, 1.5—7.8 cm. long. Flowers 
2.5-3 mm. long, white, greenish-veined. Sepals oblong-ovate, 
rounded at apex, glabrous, 1.3 mm. long. Wings spatulate-obovate, 
barely mucronulate at the obtuse (apparently, by inflection, acute) 
apex, 5-nerved, glabrous, 2.6-3 mm. long, 1.3-1.6 mm. wide. Keel 
2.8 mm. long; crest weakly 3-lobed on each side. Upper petals 
oblong-oval, rounded at apex, 2.8 mm. long. Capsule oblong- 
elliptic, barely emarginulate, very narrowly winged on upper side, 
3-3.5 mm. long, 1.6 mm. wide, the upper cell slightly the longer, 
both dehiscent. Seeds subcylindric, straight, 2.5-3 mm. long, 
black, subsparsely puberulous. Aril 1-1.9 mm. long. — Chod.! 
Monog. ii. 284. t. 26. f. 6-7 (1893). P. scoparia of most auth., at 
least in part, not HBK. P. scoparia HBK. var. multicaulis Gray! 
Pl. Wright. i. 38 (1852). P. Wrightii Gray ex A. W. Benn. Journ. 
Bot. xvii. 205 (1879), as syn. P. scoparia var. multicaulis. — SoN- 
orA: Pine Mesa, 2135 m., 19 Dec. 1890, Hartman 352 (G); between 
San Pedro and Fronteras, Sept. 1890, Hartman 914 (G). Coa- 
HUILA: mountains east of Saltillo, Apr. 1880, Palmer 69 (GK); 
Saltillo, May 1898, Palmer 115 (G); Sierra de Parras, Mar. 1905, 
Purpus 1037 (BG). San Luis Porost: San Miguelita Mts., 
4 Aug. 1877, Schaffner 2 (G). Also Texas: Vasey, Jones 3774, 
Thurber 168, Wright 100 (rypx of P. scoparia var. multicaulis: G), 
934; and Arizona: foothills of the Santa Rita Mts., 25 June 1884, 
Pringle (Type couu.: GK); Rincon Mts., Lemmon. —T. 2. Fie. 
81. — For a discussion of the marks of distinction between this 
species and its near relative P. scoparia, with which it has been 
much confused, see no. 133. 
131. P. microtoncna Chod. Stems virgate, striate, angled, 
glabrous, 3 dm. long, denudate below, leafy and corymbosely 
branched above, from a persistent root. Leaves acicular, acute, 
glabrous, 7-10 mm. long, 1. mm. broad, or less. Racemes terminal, 
loosely flowered, very slender toward apex, 5-9 cm. long; pedicels 
1 mm. long. Flowers (rosy) violaceous, 3-3.5 mm. long. Sepals 
ovate, acute, narrow, glabrous. Wings elliptic-spatulate, clawed, 
the limb oblong, 3-nerved, longer than corolla. Crest of about 3 
pairs of linear lobes and 2 triangular lamellae. Capsule longer than 
the wings, oblong-elliptic, inequilateral, on one wide very narrowly 
