44 Contributions from the Gray Herbarium 
appears to be narrowly wing-margined. These wing-like append- 
ages are not noticeable until one inserts a dissecting needle and 
raises them from the corolla-tube-surface. The appendages of 
N. humifusum are simply a modification of the above phenomenon 
but here the tips of the appendages are free and extend above the 
adnate portion of the filaments so that the appendages are obvious 
as such. The truth would thus seem to be represented better by 
the following contrasting statements. 
Appendages appearing as narrow wing-margins to the adnate 
PORUIOKE OF Ce Sinee ne i eee oe N. stenocarpum. 
Appendages free for about one-third their length............ N. humifusum. 
Since the Californian and Mexican specimens exhibit no other 
differences and since even this very obscure difference is virtually 
a variation of a single character it seems to me problematical 
whether the northern plants are specifically distinct from the 
Mexican. 
NAMA STENOPHYLLUM Gray, var. egenum, var. nov., adpresse 
strigosum haud villoso-hirsutum. — Texas: bluffs of Delaware 
Creek, Guadalupe Mts., 1882, Havard, no. 15 (Tyrr, Gray Herb.). 
Mexico: San Lorenzo and Parras, Coahuila, 1880, Palmer, no. 
. The typical form, represented by Palmer’s no. 861, is villous- 
hirsute with spreading hairs. Dr. Gray mentioned the fact that a 
form existed in which the spreading pubescence is wanting [cf. 
Hemsley Bot. Biol. Centr.-Amer. ii. 361 (1882)]. This variation is 
so striking that it seems to me worthy varietal recognition. 
Nama rotundifolium (Gray), comb. nov. N. rupicolum Bonpl., 
var. rotundifolium Gray in Hemsl. Bot. Biol. Centr.-Amer. ii. 363 
(1 . origanifolium HBK., subsp. rupicolum (Bonpl. ) Brand, 
ae) (Gray) Brand, A Ae gilbert iv. 251, 150 
The long silky villous pubescence and extremely elongate pedi- 
cels of N. rotundifolium are features in strong contrast to the short, 
dense, in part felt-like pubescence and short pedicels of both N. 
rupicolum and N. origanifolium. Besides, neither of these species 
has been found farther north than the southern portion of San Luis 
Potosi. N. rotundifolium is known only from Coahuila and Nuevo 
Leon. Bilimek no. 392 from Puebla, referred here by Brand, is 
genuine N. rupicolum. It is worthy of note that Brand saw no 
specimen of N. rotundifolium. | 
