38 Contributions from the Gray Herbarium 
o. Dorsal margin of aril suberect........ 59. P. consobrina. 
0. ge al margin of aril not suberect, Pp. 
53. P. cuspidulata. 
Pp. 
p. Capsule spareely incurved- or appressed- 
rulous on sides, q. 
q. Lbavex glauce: cre beneath; wings 
6.5- 45. P. appressipilis. 
q. Leaves pot glauceseent beneath; wings 
5. 54. P. microtricha. 
r. tower | sigh 1-1.4 op Fron: 2 Ge nie ate 51. P. brachysepala. 
r. Lower sepals (1.5) 2 lon 
Spreadin pe: pal cy meat si short, 
Very NuMierons oo ks cca 42. P. amphothriz. 
&. Spreading bi g hairs 0 of stem longer, compara- 
tively few 
Aril aa comparatively large umbo. 
49. P. Albowiana. 
t. Aril with minute umbo 
u. Dorsal margin of aril descending at 
an angle of about 45°........ 58. P. Hayesit. 
u. Dorsal margin of a ht po me 
— A 5mm tees leaves lance- 
Jenin Faber en te ee 44. P. chiapensis. 
u. Dorsal: eC: of aril aay. erec- 
3-3.8 
mm. deep; 
: ee dees pu. ek. consobrina, 
‘ es ee i i ca os cowie dois, o4 times as 
v. Stem-pubeseence of short appressed or incurved hairs 
w. Wings 9, 5 mm. long, x 
S.A VOR CI CNNN as oii oer sis ks 0b 67. P. Selert 
x. Leaves rather densely incurved-puberulous beneath.66. P. tatoo 
w. Wings 5.5 mm. wee Bet ee Eee ee 59. 2. 00 
v. Stem-pubescence in ding longs spreading hai 
y. Wings very narrowly oblong (1.2-1.8 mm gee ag 
nt ro over outside with rather an 
eer bia Vd ins rs Oe 57. P. hebantha. 
y. Wings Sacer no Servo merely on st or also to- 
ard apex with shorter more or less incurved hairs 
(longer and more eq paligags " waaaaeniels ¢ Zz. 
2. a ee .5 mm. long o 
Seed glabrous; al. Bec bs arn investing wes 
with short horizontal dorsal lobe .60. P. guatemalensis. 
aa. Seed pubescent; aril much large: asque-shaped, 
with obliquely erectish ee ey bb. 
bb. Aril finely crenate a anbeaiee vlacksee tn dtiue al, P. — 
bb. Aril m 
z. Wings 7-10 mm. long, ae 
cc. Leaves with numerous long straight spreading 
airs on veins beneath, 
dd. Aril3 mm. deep, eh obliquely erectish ee 
lobe (Pama) 5c3 sao ewed seas P. panamensis. ° 
dd, Aril 2 mm. deep, with nearly horizontal — 
lobe (Veen Greig) So 64. P. biformipilis. 
cc. Leaves with Mire of of epineh Renentls nearly all in- 
PB Mons or Nadie Skane 
ee. ] s 
ee. Au pokore a be mene but subentire....... 66. P. isotricha. 
eee ee a i ah alt oe ee 
