56 Contributions from the Gray 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 mm. longo. 
Semen (immaturum) patenti-pilosulum 4 mm. longum. Arillus 
corneolus 1—1.2 mm. altus, umbone magno sparse piloso, lobis 3 
corneolo-scariosis subaequantibus. — San Luis Porost: crevices 
of steep cliffs, Sierra de Guascama, Minas de San Rafael, June 
1911, Purpus 5166 (rypE coLL.: BG).—T. 2. Fie. 41. 
70. P. MACRADENIA Gray. Stems very numerous, branched, 
crowded, erectish or ascending, fruticulose below, from a thick 
woody root, flexuous, densely leafy, densely canescently incurved- 
or incurved-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- 
sessile 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 26.3 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). — 
Coanuita: 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 -_ Mexico. — T. 2. Fie. 42. 
duloso-pilosa (Chod.), comb. nov. Folia linearia vel 
Ar tt crassa supra concava vel sulcata subtus convexa 
sparse incurvo-patenti-puberula non canescentia 1.2-3 mm. longa 
