484 
much longer, linear-lanceolate, subulate-acuminate ; flowers rose- 
colored, the hermaphrodite few or many in the centre of the head, 
the corolla resinose-granular towards the throat; anther tips ex- 
serted; achenes hispidulous. 
Differs from typical Pluchea fetida (L) B. S: P., in the follow- 
ing particulars. The stem is usually taller and stouter. The 
leaves are thicker and firmer, broader at base, the uppermost tri- 
angular-ovate. The axillary branches on which the clusters of 
heads are borne are usually very short, giving the whole inflores- 
cence a racemose appearance, but are sometimes elongated as in 
ordinary P. fetida. The clusters are very dense, the peduncles of 
the heads being short. The heads are somewhat larger and the 
involucre much more imbricated. The scales are deeper colored 
and more pubescent, the outer shorter, broader and more rounded. _ 
Collected at St. Mark’s, Florida by Rugel in 1843, and by 
Mr. George V. Nash (No. 1434) near Eustis, Florida, in 1894. 
Grows at the margins of lakes in grassy, swampy ground. Flow- 
ers in July and August. May prove to be a distinct species. 
“ Treucrrum Nasui n.sp. Perennial, herbaceous; stem 6-9 dm. 
high, erect, branching above, four-angled, deeply suicate, ae 
escent with a fine, appressed pubescence; leaves short-petioled, 
blade 4-10 cm. long, 1-3 cm. wide, oblong to ovate-lanceolate, — 
acute at both ends, closely and evenly serrate, dark green an 
_minutely appressed-pubescent above, densely white-tomentos¢ — 
_ and less deeply reticulated nutlets. 
_ Duval county, Florida, by Mr. A. H. Curtiss (No. 1975), and né 
_ Eustis, Florida, in 1894, by Mr. George V. Nash (Numbers } 
1505 and 1516), i 
beneath, veins prominent on the lower surface; calyx white-to- 
mentose, three upper teeth short triangular-ovate, the middle one 
slightly longer, acute, the others rounded, two lower teeth consid- — 
erably longer, triangular-lanceolate, rather. abruptly subulate-acu- 
minate to almost mucronate; corolla minutely glandular-puberte 
lent; nutlets brown, reticulated, areole shallow. ny 
Resembles 7: Canadense, from which it differs in the finer pur 
bescence of every part, in the darker green upper surface of 2 
leaf, in the densely white-tomentose under surface, in the br ne a 
and more rounded upper teeth and the more abruptly pomtees” 
lower teeth of the white-tomentose calyx, and in the rather larger 
Collected in middle Florida in 1836, by Dr. Chapman 
