264 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
Collected by Rose and Painter in two localities near Tehuacdin, Puebla, September 
1905 (no. 8942). This species was very common, but collectors might easily over- 
look it. 
Type U. 8. National Herbarium no. 453435. 
The flowers occur in great. masses on the lower parts of the stem and branches of 
the host, often retarding its growth and doubtless eventually causing its death. 
Pilostyles mexicana (Brandeg.) Rose. 
Apodanthes mexicana Brandeg. Zoe 5: 244. 1908. 
Host Calliandra grandiflora Benth. 
Pilostyles palmeri Rose, sp. nov. FIGurE 22, 
Somewhat similar to P. glomerata, but flowers smaller (2 mm. long), the bracts 
and sepals deep purple, the petals 
nearly white or tinged with pink, the 
style sessile, the ovary with the 4 
placentas hardly indented, and the 
ovules borne in definite lines. 
Only the female flowers are known. 
The host plant is also a Parosela, 
probably P. leucostoma Rose. 
Collected by Dr. E. Palmer near 
FIG. 22.—Flowers of Pilostyles palmeri. a, Female Alvarez, San Luis Potosf, May, 1905 
flower, the ovary exposed; b, cross section of ovary; (no, 584). 
c, male flower, interior exposed, Scale 6, Type U. S. National Herbarium no. 
570088. 
a 
Pilostyles pringlei (S. Wats.) Rose. 
Apodanthes pringlei S. Wats. in Robins. Bot. Gaz. 16:83. 1891. 
Host Parosela hospes Rose. 
Pilostyles sessilis Rose sp. nov. FIGURE 28, 
Similar to P. glomerata, but bract and sepals deep purple, stigma sessile, inside 
walls of the capsule irregularly rugose, covered with seeds throughout. 
The male flowers also have a sessile column and the stamens form a broad band of 
4 rows. 
The male flowers are described from specimens collected by Mr. Rose near Ixmi- 
quilpan, Hidalgo, in 1905 (no. 9041). Only a single plant infested by this parasite 
was here found, although diligent search was made for others. The female flowers 
c a 
a b 
Fig, 23.—Flowers of Pilostyles sessilis. a, Female flower, the ovary exposed; b, longitudinal section of 
same; c, transverse section of ovary; d, longitudinal section of male flower. Scale 6. 
are described from specimens collected by Rose and Painter on the Hacienda 
Ciervo, Querétaro, August 20, 1905 (no. 9636). Many specimens of the host were 
found infested, and a large series of herbarium specimens were collected. 
The host in both the cases is a Parosela, probably P. tuberculata Rose, 
Type U. 8. National Herbarium no. 463127. 
