30 Contributions from the Gray Herbarium 
ovales apice rotundatae basi vix unguiculatae sparse ciliatae et cos- 
tam secundum et apicem et marginem versus pubescentes pilis ad- 
scendentibus 5-6 mm. longae 3-3.3 mm. latae. Carina glabra 
alas aequans. Petala superiora oblonga apice parum dilatata. 
Ovarium dense pilosum. Fructus deest. — Jatisco: Rio Blanco, 
Sept. 1886, Palmer 735 (Type: G). 
32. P. opscura Benth. Many-stemmed from a suffruticulose 
base, erect, 1.2-3.8 dm. high. Stems and inflorescence grayish- 
puberulous with incurved or rarely partly subspreading hairs. 
Lower leaves oblong or oval-oblong, obtuse, mucronulate, with 1-2 
pairs of lateral nerves, not reticulate, densely puberulous with in- 
curved hairs or subglabrate, very shortly petioled, 1.2-2.8 em. long, 
4-7 mm. wide; middle and upper oblong or even oval-ovate to 
lanceolate or linear, obtuse to acute or acuminate, mucronulate, 
densely or sparsely puberulous with incurved hairs, 1.8-4.2 cm. 
long, 1.5-12 mm. wide. Racemes loosely flowered, 3.3—9 cm. long. 
Flowers purplish. Sepals lanceolate, acute, pubescent. Alae oval- 
obovate or elliptic, rounded at apex, sparsely pubescent along mid- 
dle and toward apex, 4.5-6.5 mm. long, 24.5 mm. wide. Keel 
nearly glabrous, 4.8-6.5 mm. long. Staminal tube sparsely pilose. 
Upper petals obovate-oblong, sparsely pubescent, 3.5 mm. long. 
Capsule elliptic, slightly emarginate, when young (ovary) usually 
densely puberulous, in age glabrate and ciliate, or sparsely or 
densely puberulous on sides, 8-10 mm. long, 6-8 mm. wide. Seeds 
pilose, 44.8 mm. long. Aril 1.3-3 mm. long, veil-like, appressed, 
with broad irregularly lobulate scarious margin and pubescent 
umbo, but without distinct dorsal and lateral lobes. — Divisible 
into two varieties. 
S > Var. genuina. Alae 4.5-5.5 mm. longae 2-3 mm. latae. Car- 
ina 4.8-5 mm. longa. Capsula 8 mm. longa 6 mm. lata. — P. 0b- 
scura Benth.! Pl. Hartw. 58 (1840); Chod. Monog. ii. 20. t. 18. 
f. 31-32 (1893). P. puberula Gray! Pl. Wright. i. 40 (1852); not 
of Chod. 1. ¢. 22. t. 14. f. 1-3 (1893); Rob. in Gray, Syn. F'. i. pt. i. 
450 (1897), in part. — Curmuanua: hills near Cusihuiriachic, 30 
Aug. 1887, Pringle 1506 (G). Duraneo: near City of Durango, 
1896, Palmer 627 (G). Oaxaca: Jurgensen 474 (KX); Hacienda 
del Carmen, 1839, Hartweg 446 (type of P. obscura: BK); rocks, 
Misteca Alta, 2135-2440 m., 1840, Galeotti 883 (K). Also Texas: 
valley of the Limpia, 1849, Wright 104 (rypx of P. puberula: BGK); 
