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. 73a. Leaves densely white-woolly beneath (flowers yellowish, late summer) --74. 73b. Leaves smooth or hairy, never white-woolly --75. 74a. Heads 6-8 mm. wide (4-8 dm. high) =Wormwood, Artemisia stelleriana.= 74b. Heads 3-4 mm. wide (5-10 dm. high) =Wormwood, Artemisia ludoviciana.= 75a. Principal bracts of the involucre 5, with frequently a few much smaller ones --76. 75b. Principal bracts of the involucre numerous --77. 76a. Heads few in small terminal clusters; foliage somewhat viscid-pubescent (6-15 dm. high; flowers yellow, summer) --114a. 76b. Heads very numerous in flat-topped clusters; foliage never viscid-pubescent (1-2 m. high; flowers white, late summer) --105c. 77a. Leaves broadly halberd-shape, 3-lobed (1-2 m. high; flowers white, late summer) --105b.