STANDLEY—TROPICAL AMERICAN PHANEROGAMS, 105 
of the capitate inflorescence linear, subulate-tipped, pectinate-ciliate, inconspicuous; 
corolla puberulent, not striate; stamens 5, 6 mm. long; corolla puberulent, not striate; 
legumes narrowly oblong, 16 mm. long or less, 3 mm. wide, acute, short-beaked, 
acute at the base and nearly sessile, densely spiny-hispid, the slender spines 2 to 3 mm. 
long. 
Typ Locatiry: Panama, in meadows near the town of Nata; type collected by 
Seemann (no. 98). 
SPECIMENS EXAMINED: 
Panama: Aguadulce, Province of Coclé, in savannas, near sea level, Pittier 4952. 
Ancén Hill, Brother Celestine 66. 
This seems worthy of specific rank, differing from Mimosa debilis in its numerous 
spines, broader stipules, and narrow leaflets. 
Known in Panama as ‘‘dormidera de escobilla” and ‘‘ciérrate de escobilla” (Brother 
Celestine). 
Mimosa williamsii Standley, sp. nov. 
A slender vine with trailing stems 2 meters long or more; branches terete, green- 
glabrate or very sparsely retrorse-strigose, unarmed, or with a very few short slender 
spines; stipules linear, acuminate, 3 to 4 mm. long, rigid, erect, canescent, pectinate, 
ciliate; petioles slender, 35 to 60 mm. long, tipped with a subulate appendage 4 to 7 
mm, long, retrorsely strigose and puberulent, each bearing 1 or 2 slender recurved 
spines 1.5 mm. long; pinnz 1 pair, divergent, their rachises 15 to 20 mm. long; leaflets 
2 pairs on each rachis, the inner one of the lower pair usually much reduced and not 
more than one-fifth the length of the others; leaflets elliptic-oblong to oblong- 
oblanceolate, very unequal at the base, the midvein strongly excentric, acutish, 
abruptly contracted into a mucro 1.5 mm. long, setose-strigose on the upper surface 
and with numerous very slender soft white hairs, beneath densely strigose; peduncles 
slender, 15 to 32 mm. long, glabrous or nearly so, ascending or recurved; bracts of the 
capitate inflorescence linear, with subulate tips, scarcely equaling the corollas; 
corolla about 2 mm. long, glabrous, not striate; stamens 5; fruit oblong or oval, 8 to 20 
mm. long, about 7 mm. wide, obtuse or abruptly acute at the apex and bearing a subu- 
late tip 2 mm. long, contracted at the base into a stipe 3 to 4 mm. long, 1 to 3-seeded, 
the valves plane, articulate, abundantly setose-strigose and cinereous-puberulent. 
Type in ‘the U. S. National Herbarium, no. 677919, collected in the vicinity of 
Penonomé, Panama, February or March, 1908, by R. 8. Williams (no. 101). 
Most closely related to Mimosa albida, but differing conspicuously in its promi- 
nently stipitate, short, few-seeded fruit, sparse, retrorse-strigose pubescence, and 
glabrous corolla. 
Morongia pilosa Standley, sp. nov. 
Stems prostrate, stout, sharply 5-angled, green, copiously pilose with slender white 
hairs, armed on the angles with numerous slender recurved spines 2 mm. long; stipules 
setaceous, erect, 3 mm. long; petioles 35 to 80 mm. long, slender, pilose, closely beset 
with rather stout recurved spines, bearing 5 to 7 closely approximate pairs of pinns; 
rachises of the pinnz 12 to 25 mm. long; leaflets 11 to 22 pairs, the lowest pair borne 
almost at the base of the rachis, linear-oblong, 3.5 mm. long, hardly 1 mm. wide, thin, 
smooth, appressed-pilose, obtuse, oblique at the base, sessile; peduncles 5 to 8 mm. 
long, rather stout, villous, bearing numerous short recurved spines, solitary or 2 
together, axillary or racemose at the ends of the branches; heads of flowers small, 3 to 
4 mm. in diameter exclusive of the stamens; bracts linear, setaceous-tipped, pilose- 
ciliate; corolla glabrous, short-stipitate; stamens pink, exserted 3 to 4 mm.; mature 
fruit not seen, the slightly developed ovaries 4-angled, glabrous on the faces and 
smooth, densely setose-hispid on the angles. 
