present; basal leaves present or absent --62.

61a. Leaves toothed or lobed; flower-stalk not scaly
=Adenocaulon, Adenocaulon bicolor.=

61b. Leaves deeply cleft; flower-stalk scaly --197a.

62a. Leaves compound or dissected (flowers in summer and autumn)
--63.

62b. Leaves merely lobed, never truly compound or dissected --72.

62c. Leaves entire or serrate --78.

63a. Some of the involucral bracts leaf-like, longer than the heads
(3-20 dm. high; flowers yellow or greenish, summer and autumn)
(Beggar Ticks) --126.

63b. Bracts short and not leaf-like --64.

64a. Heads 7-20 mm. wide, in a flat-topped or convex cluster (3-10
dm. high; flowers yellow, summer) (Tansy) --65.

64b. Heads smaller, in spikes, racemes, or panicles (flowers yellow
or greenish, late summer and autumn) (Wormwood) --66.

65a. Heads 7-10 mm. wide, numerous in a dense cluster
=Tansy, Tanacetum vulgare.=

65b. Heads 10-20 mm. wide, few, 2-10 in a loose open cluster
=Tansy, Tanacetum huronense.=

66a. Heads 2-3 mm. broad (4-15 dm. high) --67.

66b. Heads 4-6 mm. broad (3-10 dm. high) --69.

67a. Leaf-lobes narrowly linear, strictly entire
=Wormwood, Artemisia caudata.=

67b. Leaf-lobes serrate --68.

68a. Heads in a loose spreading panicle
=Wormwood, Artemisia annua.=

68b. Heads in axillary clusters, producing a leafy spike-like
panicle =Wormwood, Artemisia biennis.=

69a. Leaf-lobes narrowly linear --70.

69b. Leaf-lobes oblong to obovate, not linear --71.

70a. Shrubby; involucre pubescent
=Southernwood, Artemisia abrotanum.=

70b. Herbaceous; involucre glabrous or rarely pubescent
=Wormwood, Artemisia canadensis.=

71a. Leaves finely gray-pubescent on both sides
=Wormwood, Artemisia absinthium.=

71b. Leaves smooth or nearly so above, densely white-woolly beneath
=Mugwort, Artemisia vulgaris.=

72a. Heads 2-4 cm. broad, purple, blue, or rarely white (3-6 dm.
high; summer) --92.

72b. Heads 1 cm. wide or less --73.