LXXI1I. COMPOSIT£ (OLIVER AND HIERN). 257 
Subtribe vii. BurpHTHaLMEz. 
Involucre at length subglobose, hard . . . . . . . . 49. Grigerta. 
Involucre wide ; scales broadly scarious-appendaged . . . 650. ONDETIA. 
Involucre hemispherical ; scales pauci-seriate, the outer ones 
usually herbaceous. 
Pappus coroniform, consisting of short unequal pales and 
afewlongerariste . . . . . 1... se . 51. ANISOPAPPUS. 
Pappus consisting of pales as long as the ovary . . . 52. OponrosprrMuM. 
Trine V. Helianthoides. Capitula heterogamous, radiate or 
rarely discoid, ray-florets ¢ fertile or neuter, disk-florets 8 fertile or 
sterile; or capitula homogamous discoid unisexual or with all the 
florets ¥§. Involucral bracts various. Receptacle paleaceous or rarely 
on the disk, under the sterile florets, naked. Corolla of the herma- 
phrodite florets tubular, regular, 4—5-cleft. Anthers appendaged at 
the apex, at the base entire obtuse or scarcely tailed. Style-branches 
of the ¥ florets truncate or appendaged. Achenes various, usually 
compressed or angular ; pappus aristate or shortly paleaceous or want- 
ing.—Leaves, at least the lower ones, usually opposite. Flowers usnally 
yellow. 
Capitula unisexual. Anthers scarcely cohering. Leaves 
alternate or mostlyso  . . 1. . eee 
Capitula bisexual. Anthers cohering. Leaves mostly 
Opposite. 
Pale of the receptacle usually folded or convex. 
Achenes of the disk angular subterete or laterally 
compressed rr 
Palew of the receptacle flat or nearly so. Achenes of oo. . 
the disk more or less dorsally compressed . . . Subtribe iti. Coreopsidee. 
Subtribe i. Awprostum. 
Tnvolucre of the male capitula gamophyllous. Female capi- 
tulal-flowered. 2. 1 1 we ee ee es 
Involucre of the male capitula with free bracts. Female 
capitula 2-flowered . . . . . - . . » + + . 64, XANTHIUM. 
Subtribe ii. VErsrstnem. 
Inner involucral bracts (or outer palee of the receptacle) 
embracing the fertile ray-achenes. 
Ray-florets in one row. (Outer) involucral bracts 5, narrow 55. SIGESBECKIA. 
Y-florets in many rows. (Outer) involucral bracts 4, 
Subtribe i. <Ambrosiee 
Subtribe ii. Verbesinee. 
53. AMBROSIA. 
broad . 2... 56. ENHYDRA. 
Inner inyolueral bracts flat. 
Palee of the receptacle very narrow, usually few . . . 97. Ecurrta. 
Palee of the receptacle broader, numerous, 
Leaves mostly alternate. . . . . . . . . + + 58, ScLEROCARPUS. 
aves opposite. 
Pappus forming a small cup or annulus, with or with- 
out 2-3 ariste. 
Ray-florets fertile. 
Ligule small. Ariste of the pappus 2 or 3, per- 
sistent . . 
toe ee we ee «69, BLAINVILLPA 
Ligule conspicuous. Ariste or short sete of the 
pappuscaducous . . . .. . 60. Wepe1ia. 
Ray-florets neuter. Ligule conspicuous . . . - 61. AsPILIA. 
Pappus consisting of distinct ariste, rarely reduced 
to teeth, not forming a cup or annulus. ; 
VOL, III. 
