34 NORTH AMERICAN FLORA 
Leaves all alternate, the blades all or most of them dentate, 
never linear; plants densely furfuraceous, 
_ _Bracts inflated, loosely spongious; perennials. 
Radicle superior; plants never bright-green annuals with entire, 
unappendaged bracts. 
Flowers monoecious; plants never fruticose, rarely suffrutescent at 
the base. 
Bracts free, entire, unappendaged; perennials. 
Bracts united, at least at the base. 
Bracts 10-16 mm. long, the green entire margins 2—4 times as 
wide as the body of the bract. 
Bracts less than 10 mm. long, the margins usually little if 
at all wider than the body of the bract. 
Fruiting bracts not orbicular, or, if so, never radiately 
dentate to the base nor strongly compressed. 
Bracts broadest near or above the middle, usually 
rounded or truncate at the apex, or if not so, 
the leaves dentate; leaves usually large and 
petiolate. 
Leaf-blades, at least most of them, deltoid to 
deltoid-ovate or broadly ovate, broadest at 
or near the base, usually entire. 
Leaf-blades cordate at the base; fruiting bracts 
of 2 kinds on each plant. 
Leaf-blades never cordate at the base; fruiting 
bracts all similar on the same plant. 
Bracts panduriform; leaf-blades con- 
spicuously 3-nerved. 
Bracts never panduriform; leaf-blades not 
conspicuously 3-nerved. 
Bracts dentate only at the truncate 
apex, smail. 
Bracts dentate well below the apex, 
often to the base, large. 
Leaf-blades never deltoid nor ovate, usually 
broadest at or above the middle, in a few 
species the leaves broadest at the base and 
conspicuously dentate. 
Leaf-blades linear, concolorous; bracts truncate 
at the apex. 
Leaf-blades usually broad, or if, linear, the lower 
surface much paler than the upper and 
the bracts not truncate. 
Bracts red and succulent at maturity; 
perennials. 
Bracts never succulent at maturity, 
usually herbaceous. 
Annuals, or one species perennial and 
with unappendaged bracts. 
sar ora sides of the bracts tubercu- 
late. 
Bracts ovate or hastate-ovate, broadest at or near 
the base, usually about twice as long as broad, 
small, sparsely dentate or tuberculate, or entire 
or smooth, acute; leaves small, sessile, the blades 
entire, ovate to linear. 
Fruiting bracts orbicular, finely and regularly radiate- 
dentate to the base, strongly compressed. 
Flowers dioecious, or a few pistillate flowers rarely present on the 
staminate plants, or, if the flowers monoecious, the plants 
fruticose nearly throughout. 
Bracts never longitudinally 4-winged, the sides smooth or 
variously appendaged. 
Leaves all or nearly all opposite. 
Leaves alternate, or only the lowest opposite. 
Leaf-blades dentate. 
Bracts entire, unappendaged. 
Bracts dentate or appendaged, or both. 
Fruiting bracts 7-15 mm. long, usually long- 
pedicellate, the sides with numerous long 
flattened appendages. 
Fruiting bracts 2~3 mm. long, sessile, the sides 
smooth or short-tuberculate. 
Leaf-blades entire or merely undulate. 
Plants annual or perennial, usually less than 6 dm. 
high, or the branches, if longer, procumbent 
or prostrate, usually fruticose only at the base, 
the branches never spinose. 
Leaf-blades never sagittate. 
Til. 
Iv. 
Vv. 
VI. 
Vit. 
x. 
VITl. 
XI, 
XII. 
XIV. 
XVI. 
XII. 
XV. 
XVII. 
XIX, 
XXII. 
XVIII. 
| VoLUME 21 
ROSEAE. 
LINDLEYANAE. 
CALIFORNICAE, 
GRACILIFLORAE. 
SACCARIAE. 
POWELLIANAE. 
. TRUNCATAE. 
ARGENTEAE. 
WOLFIANAE. 
SEMIBACCATAE. 
ARENARIAE. 
LEUCOPHYLLAE. 
PUSILLAE. 
ELEGANTES. 
WATSONIANAE. 
HYMENELYTRAE. 
ACANTHOCARPAE. 
BARCLAYANAE, 
