1	Racemes bracteate throughout		10 A. axilliflora
+	Racemes ebracteate, rarely lowermost 1-3 flowers bracteate.		(2)
2 (1)	Annuals; fruiting pedicel thickened, at least half as wide as fruit; rachis flexuous		14 A. auriculata
+	Biennials or perennials; fruiting pedicels much narrower than fruit; rachis not flexuous.		(3)
3 (2)	Shrubs or subshrubs; style absent or obsolete; fruit densely pubescent		12 A. fruticulosa
+	Herbs; style distinct; fruit glabrous or if pubescent (A. flagellosa) then leaves dentate.		(4)
4 (3)	Scapose perennials with caudices covered with petioles of previous years; trichomes almost exclusively simple, restricted to leaf margins and sepals abaxially; stems leafless or with 1-3 leafy bracts		11 A. alaschanica
+	Non-scapose biennials or perennials often without petioles of previous years; trichomes a mixture of various kinds, very rarely restricted to leaf margins; stems leafy.		(5)
5 (4)	Cauline leaves petiolate or cuneate to petiolelike base; fruit valves with an obscure midvein.		(6)
+	Cauline leaves sessile, auriculate, sagittate, or amplexicaul, rarely rounded at base; fruit valves often with a prominent midvein.		(7)
6 (5)	Biennials; petals 3-5 mm; fruit apex acuminate; Xizang [Kashmir, Afghanistan, Pakistan, Tajikistan]		13 A. tibetica
+	Stoloniferous perennials; petals 7-10 mm; fruit apex acute; Anhui, Jiangsu, Zhejiang [Japan]		9 A. flagellosa
7 (5)	Fruit and often fruiting pedicels erect, appressed to rachis.		(8)
+	Fruit and fruiting pedicels divaricate or reflexed, fruit sometimes erect on divaricate or ascending pedicels never appressed to rachis.		(10)
8 (7)	Petals (3.5-)4-5 mm; fruit 0.8-1.2 mm wide		8 A. hirsuta
+	Petals 6-10 mm; fruit 1.5-2 mm wide.		(9)
9 (8)	Petals white, 3-4 mm wide, apex shallowly emarginate; sepals 4-5 mm, lateral pair saccate; middle cauline leaves pilose with primarily branched trichomes; seeds narrowly winged distally		6 A. stelleri
+	Petals purple, pink, or rarely white, 2-3 mm wide, apex rounded; sepals 2.5-3.5 mm, lateral pair not saccate; middle cauline leaves hirsute with predominantly simple trichomes; seeds broadly winged all around		7 A. pterosperma
10 (7)	Petals 3-6(-6.5) mm; lateral sepals not saccate; style in fruit 0.2-0.8 mm.		(11)
+	Petals 7-15 mm; lateral sepals saccate; style in fruit 1-2.5 mm.		(12)
11 (10)	Basal rosette absent at anthesis and fruiting; leaves with coarse subsetose trichomes mixed with sessile, much smaller stellate ones; fruit reflexed or divaricate, 1.5-2 mm wide		4 A. pendula
+	Basal rosette often present through fruiting; leaves with stalked, forked or 3- or 4-rayed stellate trichomes mixed with simple nonsetose ones; fruit ascending or erect, rarely reflexed or spreading, 1-1.5 mm wide		5 A. paniculata
12 (10)	Plants hirsute or hispid with primarily simple, subsetose trichomes		1 A. amplexicaulis
+	Plants tomentose or pilose with almost exclusively branched trichomes, sometimes glabrescent.		(13)
13 (12)	Leaves obtuse or auriculate at base; filaments 5-8 mm; petals 9-14 mm, obtuse at apex; 2-forked trichomes distinctly stalked		2 A. bijuga
+	Leaves cordate or amplexicaul at base; filaments 4-5 mm; petals 7-10 mm, truncate-emarginate at apex; 2-forked trichomes often submalpighiaceous		3 A. serrata