pec. 4, 1923 STANDLEY: NEW PLANTS FROM SALVADOR II 439 
Type in the U. 8. National Herbarium, no. 1,152,610, collected on hills 
near Santa Tecla, Salvador, March, 1923, by Dr. Salvador Calderén (no. 
1519). The following sterile specimens obtained by the writer in 1922 also 
belong here: 
Sautvapor: Santa Tecla, alt. about 900 m., Standley 23011. Voledn de 
San Vicente, alt. 1500 m., Standley 21515. 
Prunus axitliana is related to P. samydoides Schlecht., a Mexican species, 
but is distinguished by its solitary racemes and large leaves. Dr. Calderén 
reports the vernacular name as cangrejillo. The specific name commemorates 
the King or Topilzin Axitl, founder of the Province of Cuscatlén and of the 
kingdom Hueytlato or Payaqui, now the Republic of El Salvador. 
Acacia calderoni Standl., sp. nov. 
A shrub, the branches brown, the young ones densely fulvous-pilose, 
unarmed; stipules linear-subulate, 5-7 mm. long; petioles 1.5-2 cm. long, 
without glands, the leaf rachis 5-7 cm. long, densely fulvous-pilose; pinnae 
6-9 pairs, mostly 3.5-5.5 cm. long; leaflets about 23 pairs, oblong, 4-6 mm. 
long, 2 mm. wide, very obtuse, densely covered on both sides, especially 
beneath, with curved yellowish hairs, the venation obsolete on the upper 
surface, but both costa and lateral nerves prominent beneath; peduncles 
axillary or forming a terminal raceme, solitary or geminate, 1—-1.5 cm. long, 
densely pilose; flowers racemose, the racemes very dense, 1.5-2 cm. long, 
about 1.5 cm. in diameter, the pedicels very short; calyx and corolla 2.5 mm. 
long, densely pilose with short yellowish hairs. 
Type in the U. S. National Herbarium, no. 1,151,942, collected on the 
Cerro de la Olla, on the Guatemalan frontier near Chalchuapa, Salvador, in 
1922 by Dr. Salvador Calderén (no. 977). 
Closely related to A. polypodioides Standl., a species of southern Mexico 
and Nicaragua, but easily recognized by the elongate racemes, the flowers of 
A. polypodioides being capitate. 
Pithecollobium microstachyum Standl., sp. nov. 
Tree, 6-7.5 m. high, the young branchlets slender, puberulent or short- 
pilose; stipular spines stout, brownish, 1.5 cm. long or less; petioles sometimes 
4 em. long but often much shorter, glabrous, or puberulent, bearing at the 
apex a stout columnar sessile gland; pinnae one pair, the leaflets also one 
pair, nearly sessile, oblong to oblong-obovate, mostly 3.5-7 cm. long and 
1.5-3 cm. wide, but on flowering branches often not over 1 em. long, rounded 
or very obtuse at apex, oblique and obtuse or rounded at base, thick, slightly 
glabrous but ciliate when young, the venation prominently reticulate on both 
surfaces; flowers dirty white, in slender spikes 1-3 cm. long, these mostly in 
ample terminal panicles, the rachis pilosulous, the bracts lance-oblong, shorter 
than the calyx; calyx sessile, about 1 mm. long, acutely dentate, minutely 
appressed-pubescent; corolla 3 mm. long, minutely sericeous, the lobes 
oblong-lanceolate, acute; stamen tube not exserted; fruit several-seeded, 
short-stipitate, curved or coiled, minutely puberulent or glabrate, the valves 
thin, red or pink, constricted between the seeds; seeds black and shining, 7-8 
mm. long and broad, compressed, surrounded at base by a fleshy white aril. 
Type in the U. S. National Herbarium, no. 1,136,477, collected in dry 
