262 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM, 
This species resembles somewhat Bb. guateimalensis, but has the leaves larger and 
the fruit narrower, glaucous, and less notched at apex. 
EXPLANATION OF PLATE XX.—Two views of the type tree reproduced from photographs taken by 
Mr. E. A.‘Goldman. These are here used through the courtesy of the Biological Survey of the 
Department of Agriculture. 
A NEW SPECIES OF BESCHORNERIA.« 
Very little is known about the species of Beschorneria in Mexico 
itself, although I believe the genus is endemic to that country. All 
the species have been described from greenhouse material. In 1906 
Dr. Pringle rediscovered 2. yuecordes in the mountains above Pachuca 
and later in the season he took me tod the locality, where I collected 
material both for the herbarium and for the greenhouse. While 
studying this material I reached the conclusion that certain material 
from San’ Luis Potosi, heretofore referred to 2. tub/fora, represents a 
new species, and this is here described: 
Beschorneria rigida Rose, sp. nov. 
Leaves numerous, erect, rather rigid, 30 cm. long, 2 em. or less broad, narrowing 
into a long acumination, roughened on both surfaces; inflorescence about a meter 
long; bracts 15 to 20 em. long, large, purplish, each subtending 2 to 4 flowers; whole 
flower 4.5 cm. long; perianth segments dull in color, usually greenish yellow, some- 
what scabrous; stamens shorter than the segments; capsule oblong in outline, 3 cm. 
long; seeds black. 
The following specimens have been examined: 
San Luis Potosi: Near Alvarez, Palmer & Parry, 1878 (no. 866); same station, 
Dr. It. Palmer, May, 1905 (no. 598, type). 
Guanajuato: Near San Felipe, Dr. G Baroetta, 1904 (Economic herbarium U.S. 
Department of Agriculture). 
The type is U. 8. National Herbarium no. 570098. 
This has heretofore been taken for B. tubifiora, but a careful reading of the original 
description of Furcraea tubiflora clearly excludes it. The leaves are narrower, erect, 
rough on both surfaces, the flowers more numerous and duller in color. 
Dr. G. Barroetta, of San Luis Potosi, reports that this species is a fiber plant. 
RAFFLESIACEAE. 
THE NORTH AMERICAN SPECIES OF PILOSTYLES. 
The first species of Pilostyles found in North America was collected 
by Dr. Geo, Thurber in L850 in southwestern Arizona. Between that 
time and 1890 no additional species were found, but since the latter 
date much material, embracing several new species, has been received 
at the National Herbarium, especially from Mexico. Prof. Solms- 
Laubach, who monographed the genus in 1901, recognized but two 
species in North America. 
The material now on hand contains 8 species, four of which are here 
first described. All our American species are found on three genera 
of Leguminosae. 
aA. Berger has recently published another new species: Beschorneria pubescens 
Berger, Monatsschr. Kakteenk. 17: 1. 1907. 
