100 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
Concerning the locality where the specimens were gathered Mr. Attwater, the col- 
lector, says: ‘‘All of the specimens are from Brays Bayou, about 4 miles south of 
Houston. This bayou is like many others in the Gulf Region; indry weather the water 
stands in pools or holes. Its sides are lined with trees, bushes, and tangled weeds, sv 
that the water is kept shaded all day long. The particular spot where these lilies 
were taken would get only a few gleams of sunshine during the day, but I presume the 
plants grow in more open water where they are not shaded all day long. They were 
growing in water about knee-deep.”’ 
14. Nymphaea microcarpa Miller & 
Standley, sp. nov. 
Type in the U. 8S. National Herbarium, 
collected in the San Antonio River near 
San Antonio, Texas, March 26, 1910, by 
Mr. Bernard Mackensen. Preserved in for- 
malin. Described from the fresh material 
of the type collection. 
~ Distrisution.—Vicinity of San Antonio, 
Texas. 
DESCRIPTION. 
Leaves broadly rounded-ovate to orbicu- 
lar in outline, widest near the base, 12 to 25 
cm. long and 16 to 24 cm. wide, rounded at 
the apex, emarginate, dull green and gla- 
brous above, rather densely silky-pubescent 
beneath; sinus broadly V-shaped; lobes rounded; petioles terete, silky-pubescent 
throughout; sepals thin, the outer orbicular to oblong, the inner obovate, rounded, 
truncate, or slightly emarginate at the apex, the outer oil green, yellowish at the 
apex, the inner sulphur yellow, the flowers with no tinge of red; stamens in 5 or 6 
rows, the anthers slightly longer than the filaments; fruit subglobose to almost cylin- 
drical, 20 to 26 mm. high and 18 to 24 mm. in diameter, slightly constricted above, 
deeply ribbed, almost lobed, from base to top; rim of the disk somewhat spreading or 
erect, 1.5 to 2.5 mm. high; disk orbicular, 13 to 20 mm, in diameter, entire, slightly 
depressed (1 to4 mm.), the center umbonate, 3 or 4 mm. in 
diameter; rays 9 to 15, mostly 12, linear or slightly widened 
at the base, distinct, with an evident median groove, extend- 
ing to within 1.5 or 2 mm. of the edge of the disk; body of 
the fruit clear green, the edge of the disk faintly tinged with 
red; seeds 3.5 mm. long and 2.5 mm. in diameter, shining 
dark brown, ovoid, acutish. (Piare 41, A, facing p. 92. 
Fiaures 4, a, 32, 33.) Fig. 33.—Stigmatie pattern 
of Nymphaea microcarpa. 
Natural size. 
Fia. 32.—Leaf outline of Nymphaea microcarpa, 
Scale }. 
We first became acquainted with this plant through rather 
incomplete material collected by Mr. H. P. Attwater, October 
18, 1902, in the Medina River, about 15 miles southwest of San Antonio, Texas. This 
consisted of leaves and fruit without flowers. Later we were fortunate enough to 
secure specimens from Mr. Bernard Mackensen, of San Antonio, This last sending 
enables us to complete our diagnosis and to be more certain of the distinctness of the 
species. The same collector has forwarded less complete material than the type 
collected in the Cibolo River at Sutherland Springs, 30 miles east of San Antonio, 
March 27, 1910. He states that the leaves are usually floating, rarely erect. 
Nymphaea microcarpa is most closely related, perhaps, to N. ovata of San Marcos, 
Texas, a locality not fardistant. The outline of the leaves, however, is very different, 
