Macbride — Reclassified or new Compositae 37 
growing in the sand it was normal height, 4-8 dm. It appears 
evident therefore that A. deserticola cannot be a reduced state of 
Hall’s species since the conditions under which both have been 
found were altogether similar. Moreover there are slight but ree- 
ognizable differences between these plants other than size and 
habit. The more numerous ligules of A. bernardinus are minutely 
bidentate; those of A. deserticola simply dentate. In the former, 
too, the pappus of the ray-flowers scarcely equals, rather than 
exceeds the style. The style-branches of the disk-flowers of A. 
bernardinus are ovate rather than linear-lanceolate as they are 
in A. deserticola. Finally, the foliage and bracts of the latter 
species are much less pubescent. 
sateen Benth. Bot. Meus — 23 (1844). Nesothamnus 
Rydb. N. A. Fl. xxxiv. 12 (1914). Monothrix Torr. in Stansb. 
Expl. Utah : 389 (1852). Leptopharynz Rydb. |. ¢ 
I am glad to be able to agree essentially with Rydberg (1. c. 12; 
24) in his definition of Laphamia Gray, Pl. Wright. i. 99 (1852). 
I would, however, follow Gray, 1. ¢., and include in Laphamia the 
three species that have a pappus of about twenty awns. Laphamia 
as restricted by Rydberg, contains only those species with the 
pappus wanting or reduced to one or two bristles. It seems evident 
from a study of Perityle that the character of the pappus cannot 
alone be used satisfactorily for the definition of genera in this 
group of Compositae. Pappothrix (Gray) Rydb., |. c. 26, must, 
therefore, continue to be treated as Laphamia Gray, sect. Pappo- 
thriz Gray, 1. ¢., since it differs constantly in no respect from true 
Laphamia except in this pappus-character. Thus constituted the 
salient feature of Laphamia is found in the nature of the involucral 
bracts. These are always flat and rather thin, never enclose the 
achenes and are not double-ribbed on the back. 
On the other hand I cannot concur with Rydberg’s delimitation 
of Perityle. He proposes the segregate genus Leptopharnyz, |. c. 
characterized by the cylindric throat (which is distinctly longer 
than the tube) of the disk-corollas. The throat of the disk- 
corollas of Nesothamnus, Perityle and Monothriz is “ campanulate 
or funnelform, not much if at all exceeding the tube.”’ The pappus. 
of Leptopharyna consists ‘ normally of a minute crown of squamel- 
lae and 1 or 2 awns, but either or both in a few species wanting.” 
Notwithstanding this acceptance of variation in the pappus = 
