1	Leaf apex acicular awned; herbs annual, papillate, hispid, or glabrous.		(2)
+	Leaf apex obtuse, not acicular awned; shrubs, subshrubs, or annual herbs, with other types of hairs or glabrous.		(17)
2 (1)	Leaves broadly linear, proximally 5-7(-10) mm wide; perianth segment above wing reflexed, not embracing utricle; anthers free from base to near apex.		21 S. aperta
+	Leaves terete, semiterete, or narrowly lanceolate, proximally not more than 4 mm wide; perianth segments above wing embracing utricle; anthers free from base to middle.		(3)
3 (2)	Perianth segments abaxially wingless or with an irregular process in fruit.		(4)
+	Perianth segments abaxially winged in fruit.		(7)
4 (3)	Plants glabrous; leaves semiterete.		(5)
+	Plants papillate or hispid; leaves filiform-terete or narrowly lanceolate.		(6)
5 (4)	Stem and branches striate; leaves all alternate; utricle 2-2.5 mm in diam.		23 S. komarovii
+	Stem and branches not striate; lower leaves opposite, upper ones alternate; utricle 3-4 mm in diam.		22 S. soda
6 (4)	Leaves filiform-terete; flowers forming spikes on upper branches; bracts and bractlets tightly appressed to rachis; anthers 1-1.5 mm.		24 S. collina
+	Leaves narrowly lanceolate; flowers distributed throughout plant; bracts and bractlets spreading; anthers ca. 0.5 mm.		25 S. zaidamica
7 (3)	Perianth with only 1 segment abaxially winged in fruit; anthers ca. 0.3 mm.		26 S. monoptera
+	Perianth with all segments abaxially winged in fruit; anthers 0.5-1 mm.		(8)
8 (7)	Perianth segments above wing abaxially green and fleshy keeled.		(9)
+	Perianth segments above wing abaxially neither green nor fleshy keeled.		(10)
9 (8)	Perianth segment apex pungent, together connivent and forming a cone, perianth (including wings) 5-7 mm in diam.		27 S. tamariscina
+	Perianth segment apex obtuse, together embracing utricle and not forming a cone, perianth (including wings) 8-10 mm in diam.		28 S. rosacea
10 (8)	Perianth segment apex acicular, together connivent and forming a cone, rarely apex membranous and thinly long aristate.		(11)
+	Perianth segment apex not acicular, neither connivent nor forming a cone.		(14)
11 (10)	Wing margin irregularly dentate; perianth segments above wing hardened, together connivent and forming a cone; leaf base distinctly expanded.		29 S. chinghaiensis
+	Wing margin subentire; perianth segments above wing together connivent and forming a cone, or apex membranous and thinly long aristate; leaf base slightly expanded.		(12)
12 (11)	Plants slender, not more than 30 cm tall, fr. May-Jun.		30 S. praecox
+	Plants stout, to 50 cm tall, fr. Aug-Sep.		(13)
13 (12)	Stems light red-brown, yellow-brown after drying; perianth (including wings) 5-8 mm in diam. in fruit, apex of segments hardened, becoming acicular.		31 S. paulsenii
+	Stems green; perianth (including wings) 7-12 mm in diam. in fruit, apex of segments becoming acicular or membranous and thinly long aristate.		32 S. pellucida
14 (10)	Leaves 0.5-0.8 mm wide; perianth (including wings) 4-6 mm in diam. in fruit; anthers ca. 0.5 mm.		33 S. sinkiangensis
+	Leaves 1-2 mm wide (sometimes 0.5-0.7 mm wide in S. tragus); perianth (including wings) 5-10 mm in diam. in fruit; anthers 0.8-1 mm.		(15)
15 (14)	Bracts and bractlets reflexed in fruit; stigma nearly equaling style.		34 S. ikonnikovii
+	Bracts and bractlets spreading in fruit; stigma 3-4 × as long as style.		(16)
16 (15)	Stem and branches densely long hispid; perianth (including wings) ca. 5 mm in diam. in fruit.		35 S. nepalensis
+	Stem and branches hispid or subglabrous; perianth (including wings) 7-10 mm in diam. in fruit.		36 S. tragus
17 (1)	Herbs annual.		(18)
+	Shrubs, subshrubs, or annual herbs.		(27)
18 (17)	Leaves opposite, apex mucronate; seed vertical.		19 S. brachiata
+	Leaves alternate, apex obtuse, not mucronate; seed horizontal.		(19)
19 (18)	Leaves clavate; utricle berrylike; style obscure, stigmas very short.		12 S. foliosa
+	Leaves not clavate; utricle not berrylike; style distinct, stigmas subulate or filiform.		(20)
20 (19)	Plants densely furfuraceous and sparsely pilose; space present between wings of adjacent perianth segments in fruit.		11 S. implicata
+	Plants not furfuraceous, but pilose or tomentose; space not present between wings of adjacent perianth segments in fruit.		(21)
21 (20)	Leaf base not decurrent; perianth (including wings) 5-10 mm in diam. in fruit.		20 S. affinis
+	Leaf base decurrent; perianth (including wings) 10-18 mm in diam. in fruit.		(22)
22 (21)	Perianth segments glabrous.		(23)
+	Perianth segments hairy.		(24)
23 (22)	Stigmas 3-4 × as long as style; perianth segments above wing apex reflexed, forming a star shape.		13 S. subcrassa
+	Stigmas 2-3 × as long as style; perianth segments above wing connivent, forming a cone.		14 S. heptapotamica
24 (22)	Stigmas very short, 1/7-1/5 as long as style.		15 S. lanata
+	Stigmas longer, nearly equaling or 3-8 × as long as style.		(25)
25 (24)	Stigmas nearly equaling style; plants covered with suberect, long hairs when young.		16 S. korshinskyi
+	Stigmas 3-8 × as long as style; plants with sinuous hairs.		(26)
26 (25)	Anther appendage 1/10-1/8 as long as anther; perianth (including wings) 10-15 mm in diam. in fruit.		17 S. ferganica
+	Anther appendage ca. 1/2 as long as or nearly equaling anther; perianth (including wings) 15-18 mm in diam. in fruit.		18 S. sukaczevii
27 (17)	Shrubs or subshrubs, glabrous; leaf base expanded, constricted above point of expansion, appearing petiole-like.		(28)
+	Subshrubs or annual herbs, hairy; leaf base not constricted and petiole-like.		(32)
28 (27)	Perianth segments above wing membranous, slightly reflexed in fruit, together rosettelike; bractlets equaling or longer than perianth.		5 S. arbuscula
+	Perianth segments above wing leathery, not reflexed but embracing utricle, connivent, and together forming a cone in fruit; bractlets shorter than perianth.		(29)
29 (28)	Leaves of older branches alternate; inflorescence paniculate.		7 S. junatovii
+	Leaves of older branches clustered at apex of dwarf branches; inflorescence spicate.		(30)
30 (29)	Shrubs small; perianth (including wings) 8-14 mm in diam. in fruit, portion above wing together connivent and forming a cone.		(31)
+	Shrubs creeping; perianth (including wings) 5-7 mm in diam. in fruit, portion above wing tightly appressed to utricle, not forming a cone.		6 S. abrotanoides
31 (30)	Bract base decurrent; bractlet margin membranous laterally, but apex herbaceous, acute; anther appendage apex pungent.		8 S. laricifolia
+	Bract base not decurrent; bractlet margin membranous throughout, apex obtuse; anther appendage apex obtuse.		9 S. arbusculiformis
32 (27)	Subshrubs, densely covered with T-shaped hairs; globose, dwarf branches present.		10 S. passerina
+	Subshrubs or annual herbs, pilose; globose, dwarf branches absent.		(33)
33 (32)	Subshrubs; leaves persistent.		(34)
+	Herbs annual; leaves usually deciduous in fruit.		(35)
34 (33)	Perianth segments densely pilose.		1 S. orientalis
+	Perianth segments glabrous, except apex ciliate.		2 S. dshungarica
35 (33)	Perianth segment margin ciliate; anthers ca. 0.5 mm; perianth (including wings) 5-7 mm in diam. in fruit.		3 S. micranthera
+	Perianth segment margin not ciliate, or only apex ciliate; anthers ca. 1 mm; perianth (including wings) 7-9 mm in diam. in fruit.		4 S. nitraria