74 Contributions from the Gray Herbarium 
suboblique rotundatae basi et apice sparsissime puberulae 5 mm. 
longae 2.3 mm. latae. Carina 5 mm. longa subdense incurvo-pu- 
berula (unguiculo excepto), rostro cylindrico obtuso adscendente 
0.8 mm. longo. Petala superiora obovata ad apicem paullum dila- 
tata apice oblique rotundata vix retusa 3.8 mm. longa. Capsula 
submatura ovalis basi cuneata apice vix emarginulata incurvo- 
puberula 3.6 mm. longa 2 mm. lata. Semen (immaturum) breviter 
sericeum 2.8 mm. longum. Arillus (submaturus) 1.6 mm. altus 
glaber, umbone ad 0.3 mm. alto, lobis 2 lateralibus ad 1.3 mm. 
longis supra albidis corneis infra medium subscariosis. — SONORA: 
Babocomori, Sept. 1851, Thurber 1090 (rypr: G). —T.2. Fia. 51. 
93.1. P. rexensis Rob. Suffruticulose, the stems several from 
a thick simple or branched woody root, erect or ascending, green, 
sparsely or subdensely puberulous with strongly incurved hairs, 
1.2-2.8 dm. high. Lower leaves oval, mucronulate, rounded at 
apex, cuneate at base, coriaceous, reticulate, sparsely puberulous 
chiefly on midnerve beneath and margin with strongly incurved 
hairs, 8.5-12 mm. long, 4.5-6 mm. wide; middle and upper similar 
but narrowly lanceolate or lance-linear, acute or acuminate at each 
end, slightly revolute, 1.4—2.1 cm. long, 1.6—4 mm. wide, on petioles 
1 mm. or less long. Racemes normally 10-20-jointed, strongly zig- 
zag, (1.8) 3.5-6 em. long. Upper sepal ovate-oblong, acute, 3.2 mm. 
long, the lower oblong, acute, 2.6 mm. long, all more or less cilio- 
late and incurved-puberulous. Wings oblong, obtuse, sparsely in- 
curved-puberulous along midline, 5-5.3 mm. long, 2 mm. wide. 
Keel 5 mm. long, the blunt rostrum 1.4 mm. long. Upper petals 
oblong, obliquely 1-dentate at end, 4.7 mm. long. Capsule (sub- 
mature) oval, subdensely puberulous, 4.2 mm. long, 2.8 mm. wide. 
Seed (immature) sericeous, 2.7 mm. long. Aril 1.7 mm. long, the 
two lateral lobes linear, appressed. — Rob.! in Gray, Syn. Fl. i. pt- 
1. 451 (1897). — Texas: 1846, Lindheimer III. 333 p. p. (GK); 
1847-48, Lindheimer IV. 333 p.p. (K); rocky “places, — 
Guadaloupe, July 1845, Lindheimer 337 (TYPE COLL.: Qe 
manche, 8 Aug. 1877, Reverchon ‘’ 708 (G G). 
94. P. lithophila, sp. nov. Caules plures e basi fruticulosa erecti 
vel patentes ramosi foliosi incurvo-puberuli 7-15 em. longi. Folia 
media lanceolata vel oblonga acuta vel acuminata mucronata basi 
cuneata ad acuminata coriacea subreticulata sparsissime vel dense 
incurvo-puberula 2-11.5 mm. longa 0.6-4.5 mm. lata, in petiolis ad 
