30 Contributions from the (J ray Herbarium 



ovales apice rotundatae basi vix unguiculatae Bparse ciliatae et cos- 

 tam Becundum et apicem el marginein versus pubescentes pilis ad- 

 Bcendentibufl 5 6 nun. longae 3-3.3 nun. latae. Carina glabra 

 alas aequans. Petals superiora oblonga apice parum dilatata. 

 Ovarium dense pilosum. Fructus deest. Jalisco: Rio Blanco, 

 Sept. 1886, Palmer 735 (type: G). 



32. P. OBSCX7RA 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 cm. long, 

 4-7 nun. 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, 2-4.5 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, 4-4.8 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. 



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. ob- 

 scura Benth.! PI. Hartw. 58 (1840); Chod. Monog. ii. 20. t. 13. 

 f. 31-32 (1893). P.pvbendaGmyl PL Wright, i. 40 (1852); not 

 of Chod. 1. c. 22. t. 14. f . 1-3 (1893) ; Rob. in Gray, Syn. Fl. i. pt. i. 

 450 (1897), in part. Chihuahua: hills near Cusihuiriachic, 30 

 Aug. 1887, Pringle 1506 (G). Durango: near City of Durango, 

 1896, Palmer 627 (G). Oaxaca: Jurgensen 474 (K); 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 (type of P. puberula: BGK) ; 



