56 Contributions from the (Iray Herbarium 



data 7 mm. longa. Capsula oblongo-elliptica ciliolata ad basin 

 sparse incurvo-puberula glanduloso-adspersa inaequaliter emar- 

 ginata basi rotundata 5 mm. Longa 3 mm. lata, in stipe 2 nun. Longo. 

 Semen (immaturum) patenti-pilosulum 1 mm. longum. Arillus 

 corneolus I 1.2 nun. altus, umbone magno Bparse piloso, Lobis 3 

 corneolo-ecariosis subaequantibus. San Luis Potosi: crevices 

 of steep cliffs, Siena de Guascama, Minas de San Rafael, June 

 1<H1. Purpus 5166 (type coll.: BG).- T. 2. Fig. 41. 



70. P. mm i; \ni:.\i a Gray. Steins very numerous, branched, 

 crowded, erectish or ascending, fruticulose below, from a thick 

 woody root, flexuous, densely leafy, densely canescently incurved- 

 or mcurved-spreading-puberulous, 3.5-21 cm. long. Leaves oblong, 

 linear-oblong, or oblong-lanceolate, obtuse, rounded at base, thick, 

 canescently puberulous like the stem, thickly gland-dotted, sub- 

 file or on whitish petioles 0.4 mm. long, 1.2-6.3 mm. long, 0.3- 

 1.3 mm. wide. Flowers in 1-2-flowered very short racemes, purple, 

 5-5.5 mm. long. Sepals oblong-ovate, obtuse, gland-dotted and 

 subpatently pilosulous, 1.7-2.1 mm. long. Wings obovate, cuneate 

 at base, rounded at apex, sparsely spreading-puberulous, ciliolate, 

 purple, 5-5.5 mm. long, 2.5 mm. wide. Keel 3-plicate-lobed, 4.5 

 mm. long. Upper petals oblong, retuse at apex, 5 mm. long. Cap- 

 sule oblong to oblong-ovate, emarginulate, densely and canescently 

 incurved-puberulous and gland-dotted, 5-5.5 mm. long, 2.5-3 mm. 

 wide. Seed silky-pilose, comose at base, 4 mm. long. Aril 1.2-1.6 

 mm. high, with corneous vaulted sparsely pubescent umbo 0.9-1.1 

 mm. high and 3 short descending scarious-ended subappressed 

 lobes. Divisible into two varieties. 



Var. genuina. Folia saepius lanceolata vel oblongo-lanceolata 

 vix crassa supra manifeste complanata dense canescenter incurvo- 

 vel incurvo-patenti-puberula 2-6.3 mm. longa 0.6-1.3 mm. lata. 

 P. macradenia Gray! PL Wright, i. 39 (1852) ; Chod. Monog. ii. 36. 

 t. 14. f. 33-36 (1893); Rob. in Gray, Syn. Fl. i. pt. 1. 450 (1897). 

 Coahuila: Juarez, on Sabinas River, 160 km. north of Monclova, 

 Sept. 1880, Palmer 70 (BGK); Saltillo, 15-30 Apr. 1898, Palmer 29 

 (G) ; Sierra de Paila, Oct. 1910, Purpus 4759 (BG). Also in Arizona 

 and New Mexico. T. 2. Fig. 42. 



Var. glanduloso-pilosa (Chod.), comb. nov. Folia linearia vel 

 lineari-lanceolata crassa supra concava vel sulcata subtus convexa 

 sparse incurvo-patenti-puberula non canescentia 1.2-3 mm. longa 



