508 CocKERELL: NortTH AMERICAN SPECIES OF HyMENOxYS 
Henry H. Rusby. The first is a small plant, the second about 
twice as large. 
OxKLaHoma. — Cimarron River, July 13, 1869, Mark White; 
Woods Co., June 29, 1900, A. H. Van Vicet; Gloss Mts., July 
13, 1899, Mark White. 
Kansas.— Coolidge, July 4, 1892, A. S. Hitchcock; Buffalo 
Wallows, Trego Co., July 19, A. S. Hitchcock. 
/ Hymenoxys Davidsonii (Greene) 
Picradenia Davidsonu Greene, Pittonia, 4: 240. Igol. 
This plant certainly appears to be a biennial, but otherwise it 
is very close to Osterhouti and anthemoides ; much closer to them, 
so far as general appearance goes, than they are to sd/tiflora or 
chrysanthemoides. Dr. Davidson very kindly sent me some of the 
original material, from Clifton, Arizona, and also a specimen from 
Metcalf, Arizona. The latter is of smaller stature (about 12 cm. 
high), with light green foliage and rather smaller heads (disc flowers 
about 85 to a head). 
The Clifton plant was found along the river bank in the muddy 
ground ; it has about 112 disc-florets to a head ; outer bracts 8 or 
g. The outer bracts are greenish, pointed, not obviously nerved, 
with convex sides, and united not over one-third ; the inner are 
longer and larger, very broad, 3-nerved, pointed. The pappus- 
scales are colorless, broad basally, with a fairly long awn-like end ; 
they are not very much more than half the length of the disc- 
‘corolla, which is much widened at the top. The rays are well- 
developed, 5.75 mm. broad. 
INSECTS AND FUNGI ON HyMENOXxyYsS 
I have not found any record of a parasitic fungus attacking 
Hymenoxys, though two species of Puccinia (P. Actinellae (Web- 
ber) Sydow, and P. cornigera Ell. & Ev.) are known from 
Tetraneurts, 
The coccid Palaecococcus Townsendi (Ckl\l.) infests H. floribunda 
at Raton, N. M (see Psyche, 1901: 175). 
Two bees are recorded as visiting the flowers: Halictus arma- 
ticeps Cresson, visits 1. chrysanthemoides juxta at Mesilla, N. M.. 
