20 Contributions from the Gray Herbarium 
Nov. Gen. v. 407 (1821). P. ovalifolia DC. Prod. i. 331 (1824). — 
San Luis Porost: San Rafael Mts., Aug. 1877, Schaffner 7 p. p. 
(GK); without definite locality, Schaffner 495 p. p. (B); alt. 1830- 
2440 m., 1878, Parry & Palmer 48 p. p. (BK). — T. 1. Fic. 7. 
16. P.myrrituorwss Willd. Fruticulose at base, many-stemmed, 
the stems erectish, branched, up to 1.8 dm. high, like the branches, 
raceme-axes, and pedicels densely puberulous with subappressed 
hairs. Leaves elliptic to oblong-oval or oval-ovate, the uppermost 
sometimes oblong, retuse, obtuse, or acutish at apex, cuneate to 
rounded at base, subcoriaceous, reticulate below, subdensely pu- 
bescent on both faces with short subappressed hairs, the larger 
1.5-2 cm. long, 6-12 mm. wide. Racemes loosely flowered, 2 cm. 
long. Flowers 4-8. Sepals ovate-lanceolate to linear-lanceolate, 
acuminate, sparsely incurved-puberulous, 4 mm. long. Wings 
obovate-oval, obtuse or rounded at apex, incurved-puberulous, 
5.5-6.5 mm. long, 2.8-3.5 mm. wide, both sepals and wings sub- 
persistent. Keel greenish, 4.5 mm. long. Capsule elliptic, sub- 
densely incurved-puberulous and ciliolate, 6.5-7 mm. long, 6 mm. 
wide. Seed 4 mm. long, shortly pilose. Aril broadly scarious-mar- 
gined, three-lobed, the lateral lobes oblong, oblique, somewhat 
dilated at apex, the dorsal short, horizontal. — Sp. Pl. iii. 889 
(1803); Chod. Monog. ii. 18 (1893), pro parte. —San Luis Po- 
Tost: San Rafael Mts., Aug. 1877, Schaffner 7 p. p. (K); without 
locality, Schaffner 495 p. p. (B); 1830-2440 m., 1878, Parry & 
Palmer 43 p. p. (GK). Hateo: Sierra de Pachuca, alt. 2745 
m., 22 July 1898, Pringle 7654 (G). — T. 1. Fia. 8. — Chodat’s 
figures (t. 13. f. 23-24) surely are not of the species as here taken. 
17. P. Robinsonii, nom. nov. Perennial, scarcely suffrutescent, 
with 1-3 slender stems 3-7 em. high, simple or subsimple, ap- 
pressed-puberulous like the raceme-axes and pedicels. Leaves few, 
elliptic or the upper oval-oblong, rounded to obtuse at the slightly 
mucronulate apex, cuneate to rounded at base, rather thin, with 
1-2 pairs of lateral nerves, not reticulate, purplish on under side, 
densely appressed-puberulous both sides, the larger 1.3-2.3 cm. 
long, 8-16 mm. wide. Racemes few-flowered, 1.3-2.3 cm. long. 
Sepals lanceolate, subpetaloid, magenta-tinted, incurved-pilosu- 
lous, shorter than wings, soon deciduous. Alae oblong, obtuse, 
sparsely incurved-pilosulous, magenta-color, 3.8 mm. long. Keel 
yellowish, 3 mm. long. Capsule orbicular, purpurascent, incurved- 
