34 Contributions from the Gray Herbarium 
rascentes 6—-6.5 mm. longae 44.8 mm. latae. Carina alas aequans. 
Petala superiora apice parum dilatata 6 mm. longa. Capsula ellip- 
tica immaturitate sparse incurvo-pubescens maturitate glabra 
(margine ciliato excepto) 6.5-7 mm. longa 5—5.5 mm. lata. Semen 
subsericeo-pilosum 4.5 mm. longum. Arillus 1.6 mm. altus, in 
margine dorsali 2 mm. longus, umbone 0.5 mm. alto, margine scari- 
oso ad 1.1 mm. alto irregulariter lobulato in lobos non diviso. — 
PurBxa: Tlacuilotepec, June 1909, Purpus 3921 (TYPE coLL.: BG). 
— Distributed as P. obscura Benth. — T. 1. Fia. 22. 
37. P. BRANDEGEEANA Chod. Many-stemmed from a thick 
woody base, the stems branched, erectish, 7-9 cm. high, pubescent 
with incurved-ascending hairs. Leaves below much reduced, obo- 
vate, 2.5-3 mm. long, 1-1.5 mm. wide; middle and upper oblong to 
oval or oblong-linear, acute to obtuse, scarcely mucronulate, cune- 
ate-rounded at base, thickish, subglabrous but lepidote above, 
sparsely incurved-pubescent beneath, 6-10 mm. long, 1.5-4.5 mm. 
wide, on petioles about 0.5 mm. long. Racemes very short, pseudo- 
lateral, 1-3-flowered; bracts subulate, rather persistent. Flowers 
greenish, 44.5 mm. long. Sepals lanceolate to ovate-lanceolate, 
acuminate, sparsely incurved-pubescent to subglabrate, 2.3-2.7 
mm. long, the upper subpersistent. Wings oval, rounded at apex, 
unguiculate at base, ciliolate above, sparsely incurved-pubescent 
along costa, 4.5 mm. long, 2.5-2.8 mm. wide. Carina glabrous, 
greenish, 4mm. long. Upper petals purplish toward apex, 3.5 mm. 
long. Capsule elliptic, emarginate, at submaturity with a few 
hairs on side, at maturity glabrous except for the ciliate margin, 
7.5-8.5 mm. long, 6-6.5 mm. wide. Seed silky-pilose, 4 mm. long. 
Aril 1.5 mm. deep, 2.3 mm. long on back; umbo 0.6 mm. deep; 
scarious margin irregularly lobulate, with indistinct lateral and dis- 
tinct dorsal lobe descending at an angle of about 45°. — Chod.! 
Bot. Jahrb. lii. Beibl. 115. 72 (1914), as P. Brandegeeanum. — 
Pursia: dry places, El Riego, Tehuacan, July 1905, Purpus 1429 
(rypn couL.: BG). Hiateo: Zimapan, Coulter 728 p.p. (K), 
729 p. p. (K).— T. 1. Fig. 23. 
38. P. compacta Rose. Suffruticulose, many-stemmed, the 
stems subsimple or branched, ascending, 9-21 cm. high, usually 
densely leafy, like the inflorescence griseous-puberulous with in- 
curved hairs. Lower leaves obovate to oval or oval-oblong, ob- 
tuse, mucronulate, cuneate at base, 1-nerved, the lateral nerves 
