Conzatti and Smith made the statement that Uroskin- 
nera consists of two stout herbs (‘‘hierbas gruessas’’). 
This error is probably also due to the earlier statement 
by Hemsley, for Professor Conzatti has informed me 
that he has never had an opportunity of seeing Uroshkin- 
nera hirtiflora in its natural state. 
Specimens of Uroskinnera hirtiflora, collected in 19389, 
have been distributed among several institutions in North 
America and apparently represent the only material of 
this species in American herbaria. Specimens are to be 
found in the Econ. Herb. Oakes Ames; Herb. Gray; 
U.S. Nat. Herb.; Herb. Field Mus. Nat. Hist.; Herb. 
Phil. Acad. Nat. Sci.; and Herb. Inst. Biologia (Mex- 
ico). A sample of the wood of Uroskinnera hirtiflora has 
been deposited in the Wood Collection of the Biological 
Laboratories of Harvard University. 
Uroskinnera hirtiflora appears to be related to the 
Tabascan U,flavida more closely than to the Guatemalan 
U. spectabils and U. Watsonu, even though the relation- 
ship with the Tfabascan species is not close. In habit, 
Uroskinnera hirtiflora is similar to U.spectabilis; both 
are stout shrubs, five to six feet high, with large, ellip- 
tic-ovate, chartaceous, sericeous leaves, large rose-purple 
flowers with hirsute calyces, and staminodia which are 
shorter than the fertile stamens. However, Uroshinnera 
hirtiflora is more like U. Watsonu in the density of the 
indument of the leaves. Uroshinnera hirtiflora differs from 
the other species of the genus in having a 5-dentate (in- 
stead of a 4-dentate) calyx. It has the shortest stamino- 
dium of the genus. Its staminodium is one half the size 
of that of U. Watsoni, one fourth that of U.spectabilis, 
and one seventh that of U.flavida. A striking and unique 
characteristic of U.hirtiflora is the densely hirsute condi- 
tion of the interior of the corolla tube at the insertion 
of the stamens. 
[ 73 ] 
