108 ERYTHEA. 
foliage, when bruised, exhale a disagreeable odor of which 
there is no trace in the typical group. The corollas are 
usually if not always nearly destitute of a proper limb, 
the throat being elongated and almost or quite clavi- 
form, with only short suberect teeth in place of the usual 
larger and more or less spreading segments, and the style- 
tips are as commonly, perhaps quite invariably, elongated 
and filiform like those of the genus Macronema, the one dis- 
coid species of which is often mistaken by the inexperienced 
for “ Bigelovia Bolanderi” which differs from this group of 
Chrysothamnus by its involucre only. 
I have long been in a state of hesitancy as to whether this 
group should not be received as generically distinct from true 
Chrysothamnus. And again, if these shrubs do not belong to 
this genus, there is room for dispute as to whether they should 
form a genus by themselves, or be referred to Macronema, or 
to the South American Dolichogyne, to which last they bear a 
striking general resemblance. But the types of Dolichogyne 
have peculiar style-tips, rather too unlike those of any of our 
plants; and the bristles of the pappus are perceptibly 
flattened. But for these two peculiarities of Dolichogyne 
I should relegate to it all the following : 
12. C€. graveolens. Chrysocoma graveolens, Nutt. Gen. 
ii. 136 (1818). Linosyris graveolens, T. & G. Fl. ii. 234 (1842). 
Bigelovia graveolens, var. glabrata, A. Gray, Proc. Am. Acad. 
vill. 645 (1873). Chondrophora nauseosa glabrata, Rydb. 
Mem. Torr. Club, v. 317 (1894). Bigelovia dracunculoides, 
DC. Prodr. v. 329 (1836). Chrysothamnus dracunculoides, 
Nutt. Trans. Am. Phil. Soc. 325 (1840). Stout, very leafy 
almost glabrous shrub usually 3 or 4 feet high, the numerous 
long branches ending in an ample rounded cymose corymb, 
the branches of which are more or less tomentulose ; leaves 
ascending, narrowly linear, very acute, 2 or 3 inches long, 
obscurely 3-nerved, glabrous: involucral bracts about 4 in 
each vertical rank, acute, glabrous even to the margin: corolla 
with slender tube glabrous or with a few short hairs; the 
