TROPICAL AMERICAN EUPATORIEAE 35 
Owing to additional distinctions observed in Hoffmann’s § Sphaereu- 
patorium this peculiar Bolivian monotype seems best treated as a 
separate genus (see p. 23). 
key to the sections will be found in a former paper (Proc. Am. 
Acad. liv. 269) and need not be here repeated. Only one change is 
made here in the interpretation of the sections. Namely, certain 
species have been included in § Prazelis which are neither annual 
nor have peduncles of exceptional length. 
Sect. I. CyLiInprocEPHALA DC. (See Robinson, Proc. Am. Acad. 
liv. a 332, 345. 
Key TO SPECIES. 
a. Fag peer aes ripe closely appressed at the often more or less modified tip b. 
af-blade cuneately or at least obtusely narrowed at base c. 
c. 3 ads 7-Sellowered, tp th slender, acute in bud. tb E. leptocephalum. 
d. 
d. Podicels gisbrous... AG un eee 2. E. laevigatum. 
d. Pedicels —_—- 
e. Leaves of cals inicires scabrous above f. 
uP Herbaceous mature heads 8-9 mm. high, on pe Stig 
ODE cine k oles yu dao erie rae be ivaefolium. 
Fs Shrubby; atu heads 11-13 mm. long, sessile or on short 
thickish pedicels rarely 4 mm. in lengt 
g. Stems, pedicels, and lower surface of leaves sparingly pubes- 
cent; leaves scarcely over one-third as wide as long, drying 
WOR oS Ae a ares eats hin aes nivens. 
g. Stems, pedicels, and lower surface of leaves densely p ubes- 
cent or vi velvety; leaves nearly one-half as long as wide, 
aceous or darkening........-- aseiaak 
e. Leaves softly m embranaceous to gibetuctla nevus: piney pubescent 
but not scabrous a 
h. Involucre eeindvies. "he scales broadly and conspicuously 
colored (green or purple) or modified in texture near the tip; 
leaves cm. ne 
i. Leaves ovate, nearly half. as Wide as lone. ...6. E. tunariense. 
+. awe fos rg Sn one-fourth as wide as long 
. E. Arnottianum. 
h. gp iisner usually somewhat ovoid, the scales brown or 
ramineous, slightly if at all parple bordered — the tip. 
8. squalidum. 
c. Heads 40-1 -flowered k 
k. Heads rather num umerous i n widely poser at rey corymbs; 
involucre then x ord “hi mm: thiek: 22.2.4! extensum. 
k. oo few, in terminal subsimple 3-8(- -12)-headed ‘omen or 
i ulat thick J. 
l. ‘Ashenas 4.2 mm. long; outermost paidant os ge — ; pobescent on 
the back, the intermediate ones rounded 
10. . Bangit. 
1. Achenes 2.8 mm. long; al eee scales all essentially glabrous 
the back, the intermediate mucronate...... 59. E. toldense. 
b. Leaf-blade rounded, subtruncate, ag sabooedate a base (so rr imes 
very shortly acuminate at the point of insertion sel a base of broadly 
rounded contour 
